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-------------------------------------------------------------------------------
-- 
-- RapidIO IP Library Core
-- 
-- This file is part of the RapidIO IP library project
-- http://www.opencores.org/cores/rio/
-- 
-- Description
-- Containing RapidIO packet switching functionality contained in the top
-- entity RioSwitch.
-- 
-- To Do:
-- - Add support for portWrite maintenance packets.
-- - Add a real crossbar as interconnect.
-- - Change the internal addressing to one-hot.
-- - Remove acknowledge cycle when transfering packets between ports to double
--   the bandwidth.
-- - Add hot-swap.
-- - Connect linkInitialized to all ports and read it from the source port
--   using the interconnect. This will allow alternative routes since the
--   sending port can see if a receiving port is up or not.
-- - Add support for extended route.
-- - Add validity-bit to know if a route has been activly set for a particular
--   deviceId. Currently, we rely on that the routing table memory is
--   initialized in the enumeration or at device startup.
-- 
-- Author(s): 
-- - Magnus Rosenius, magro732@opencores.org 
-- 
-------------------------------------------------------------------------------
-- 
-- Copyright (C) 2013 Authors and OPENCORES.ORG 
-- 
-- This source file may be used and distributed without 
-- restriction provided that this copyright statement is not 
-- removed from the file and that any derivative work contains 
-- the original copyright notice and the associated disclaimer. 
-- 
-- This source file is free software; you can redistribute it 
-- and/or modify it under the terms of the GNU Lesser General 
-- Public License as published by the Free Software Foundation; 
-- either version 2.1 of the License, or (at your option) any 
-- later version. 
-- 
-- This source is distributed in the hope that it will be 
-- useful, but WITHOUT ANY WARRANTY; without even the implied 
-- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
-- PURPOSE. See the GNU Lesser General Public License for more 
-- details. 
-- 
-- You should have received a copy of the GNU Lesser General 
-- Public License along with this source; if not, download it 
-- from http://www.opencores.org/lgpl.shtml 
-- 
-------------------------------------------------------------------------------
 
 
-------------------------------------------------------------------------------
-- RioSwitch
-------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use work.rio_common.all;
 
-------------------------------------------------------------------------------
-- Entity for RioSwitch.
-------------------------------------------------------------------------------
entity RioSwitch is
  generic(
    SWITCH_PORTS : natural range 3 to 255 := 4;
    DEVICE_IDENTITY : std_logic_vector(15 downto 0);
    DEVICE_VENDOR_IDENTITY : std_logic_vector(15 downto 0);
    DEVICE_REV : std_logic_vector(31 downto 0);
    ASSY_IDENTITY : std_logic_vector(15 downto 0);
    ASSY_VENDOR_IDENTITY : std_logic_vector(15 downto 0);
    ASSY_REV : std_logic_vector(15 downto 0));
  port(
    clk : in std_logic;
    areset_n : in std_logic;
 
    writeFrameFull_i : in Array1(SWITCH_PORTS-1 downto 0);
    writeFrame_o : out Array1(SWITCH_PORTS-1 downto 0);
    writeFrameAbort_o : out Array1(SWITCH_PORTS-1 downto 0);
    writeContent_o : out Array1(SWITCH_PORTS-1 downto 0);
    writeContentData_o : out Array32(SWITCH_PORTS-1 downto 0);
 
    readFrameEmpty_i : in Array1(SWITCH_PORTS-1 downto 0);
    readFrame_o : out Array1(SWITCH_PORTS-1 downto 0);
    readFrameRestart_o : out Array1(SWITCH_PORTS-1 downto 0);
    readFrameAborted_i : in Array1(SWITCH_PORTS-1 downto 0);
    readContentEmpty_i : in Array1(SWITCH_PORTS-1 downto 0);
    readContent_o : out Array1(SWITCH_PORTS-1 downto 0);
    readContentEnd_i : in Array1(SWITCH_PORTS-1 downto 0);
    readContentData_i : in Array32(SWITCH_PORTS-1 downto 0);
 
    portLinkTimeout_o : out std_logic_vector(23 downto 0);
 
    linkInitialized_i : in Array1(SWITCH_PORTS-1 downto 0);
    outputPortEnable_o : out Array1(SWITCH_PORTS-1 downto 0);
    inputPortEnable_o : out Array1(SWITCH_PORTS-1 downto 0);
 
    localAckIdWrite_o : out Array1(SWITCH_PORTS-1 downto 0);
    clrOutstandingAckId_o : out Array1(SWITCH_PORTS-1 downto 0);
    inboundAckId_o : out Array5(SWITCH_PORTS-1 downto 0);
    outstandingAckId_o : out Array5(SWITCH_PORTS-1 downto 0);
    outboundAckId_o : out Array5(SWITCH_PORTS-1 downto 0);
    inboundAckId_i : in Array5(SWITCH_PORTS-1 downto 0);
    outstandingAckId_i : in Array5(SWITCH_PORTS-1 downto 0);
    outboundAckId_i : in Array5(SWITCH_PORTS-1 downto 0);
 
    configStb_o : out std_logic;
    configWe_o : out std_logic;
    configAddr_o : out std_logic_vector(23 downto 0);
    configData_o : out std_logic_vector(31 downto 0);
    configData_i : in std_logic_vector(31 downto 0);
    configAck_i : in std_logic);
end entity;
 
 
-------------------------------------------------------------------------------
-- Architecture for RioSwitch.
-------------------------------------------------------------------------------
architecture RioSwitchImpl of RioSwitch is
 
  component RouteTableInterconnect is
    generic(
      WIDTH : natural range 1 to 256 := 8);
    port(
      clk : in std_logic;
      areset_n : in std_logic;
 
      stb_i : in Array1(WIDTH-1 downto 0);
      addr_i : in Array16(WIDTH-1 downto 0);
      dataM_o : out Array8(WIDTH-1 downto 0);
      ack_o : out Array1(WIDTH-1 downto 0);
 
      stb_o : out std_logic;
      addr_o : out std_logic_vector(15 downto 0);
      dataS_i : in std_logic_vector(7 downto 0);
      ack_i : in std_logic);
  end component;
 
  component SwitchPortInterconnect is
    generic(
      WIDTH : natural range 1 to 256 := 8);
    port(
      clk : in std_logic;
      areset_n : in std_logic;
 
      masterCyc_i : in Array1(WIDTH-1 downto 0);
      masterStb_i : in Array1(WIDTH-1 downto 0);
      masterWe_i : in Array1(WIDTH-1 downto 0);
      masterAddr_i : in Array10(WIDTH-1 downto 0);
      masterData_i : in Array32(WIDTH-1 downto 0);
      masterData_o : out Array1(WIDTH-1 downto 0);
      masterAck_o : out Array1(WIDTH-1 downto 0);
 
      slaveCyc_o : out Array1(WIDTH-1 downto 0);
      slaveStb_o : out Array1(WIDTH-1 downto 0);
      slaveWe_o : out Array1(WIDTH-1 downto 0);
      slaveAddr_o : out Array10(WIDTH-1 downto 0);
      slaveData_o : out Array32(WIDTH-1 downto 0);
      slaveData_i : in Array1(WIDTH-1 downto 0);
      slaveAck_i : in Array1(WIDTH-1 downto 0));
  end component;
 
  component SwitchPortMaintenance is
    generic(
      SWITCH_PORTS : natural range 0 to 255;
      DEVICE_IDENTITY : std_logic_vector(15 downto 0);
      DEVICE_VENDOR_IDENTITY : std_logic_vector(15 downto 0);
      DEVICE_REV : std_logic_vector(31 downto 0);
      ASSY_IDENTITY : std_logic_vector(15 downto 0);
      ASSY_VENDOR_IDENTITY : std_logic_vector(15 downto 0);
      ASSY_REV : std_logic_vector(15 downto 0));
    port(
      clk : in std_logic;
      areset_n : in std_logic;
 
      lookupStb_i : in std_logic;
      lookupAddr_i : in std_logic_vector(15 downto 0);
      lookupData_o : out std_logic_vector(7 downto 0);
      lookupAck_o : out std_logic;
 
      masterCyc_o : out std_logic;
      masterStb_o : out std_logic;
      masterWe_o : out std_logic;
      masterAddr_o : out std_logic_vector(9 downto 0);
      masterData_o : out std_logic_vector(31 downto 0);
      masterData_i : in std_logic;
      masterAck_i : in std_logic;
 
      slaveCyc_i : in std_logic;
      slaveStb_i : in std_logic;
      slaveWe_i : in std_logic;
      slaveAddr_i : in std_logic_vector(9 downto 0);
      slaveData_i : in std_logic_vector(31 downto 0);
      slaveData_o : out std_logic;
      slaveAck_o : out std_logic;
 
      lookupStb_o : out std_logic;
      lookupAddr_o : out std_logic_vector(15 downto 0);
      lookupData_i : in std_logic_vector(7 downto 0);
      lookupAck_i : in std_logic;
 
      portLinkTimeout_o : out std_logic_vector(23 downto 0);
 
      linkInitialized_i : in Array1(SWITCH_PORTS-1 downto 0);
      outputPortEnable_o : out Array1(SWITCH_PORTS-1 downto 0);
      inputPortEnable_o : out Array1(SWITCH_PORTS-1 downto 0);
      localAckIdWrite_o : out Array1(SWITCH_PORTS-1 downto 0);
      clrOutstandingAckId_o : out Array1(SWITCH_PORTS-1 downto 0);
      inboundAckId_o : out Array5(SWITCH_PORTS-1 downto 0);
      outstandingAckId_o : out Array5(SWITCH_PORTS-1 downto 0);
      outboundAckId_o : out Array5(SWITCH_PORTS-1 downto 0);
      inboundAckId_i : in Array5(SWITCH_PORTS-1 downto 0);
      outstandingAckId_i : in Array5(SWITCH_PORTS-1 downto 0);
      outboundAckId_i : in Array5(SWITCH_PORTS-1 downto 0);
 
      configStb_o : out std_logic;
      configWe_o : out std_logic;
      configAddr_o : out std_logic_vector(23 downto 0);
      configData_o : out std_logic_vector(31 downto 0);
      configData_i : in std_logic_vector(31 downto 0);
      configAck_i : in std_logic);
  end component;
 
  component SwitchPort is
    generic(
      MAINTENANCE_LOOKUP : boolean;
      PORT_INDEX : natural);
    port(
      clk : in std_logic;
      areset_n : in std_logic;
 
      masterCyc_o : out std_logic;
      masterStb_o : out std_logic;
      masterWe_o : out std_logic;
      masterAddr_o : out std_logic_vector(9 downto 0);
      masterData_o : out std_logic_vector(31 downto 0);
      masterData_i : in std_logic;
      masterAck_i : in std_logic;
 
      slaveCyc_i : in std_logic;
      slaveStb_i : in std_logic;
      slaveWe_i : in std_logic;
      slaveAddr_i : in std_logic_vector(9 downto 0);
      slaveData_i : in std_logic_vector(31 downto 0);
      slaveData_o : out std_logic;
      slaveAck_o : out std_logic;
 
      lookupStb_o : out std_logic;
      lookupAddr_o : out std_logic_vector(15 downto 0);
      lookupData_i : in std_logic_vector(7 downto 0);
      lookupAck_i : in std_logic;
 
      readFrameEmpty_i : in std_logic;
      readFrame_o : out std_logic;
      readFrameRestart_o : out std_logic;
      readFrameAborted_i : in std_logic;
      readContentEmpty_i : in std_logic;
      readContent_o : out std_logic;
      readContentEnd_i : in std_logic;
      readContentData_i : in std_logic_vector(31 downto 0);
      writeFramePort_o : out std_logic_vector(9 downto 0);
      writeFrameFull_i : in std_logic;
      writeFrame_o : out std_logic;
      writeFrameAbort_o : out std_logic;
      writeContent_o : out std_logic;
      writeContentData_o : out std_logic_vector(31 downto 0));
  end component;
 
  signal masterLookupStb : Array1(SWITCH_PORTS downto 0);
  signal masterLookupAddr : Array16(SWITCH_PORTS downto 0);
  signal masterLookupData : Array8(SWITCH_PORTS downto 0);
  signal masterLookupAck : Array1(SWITCH_PORTS downto 0);
 
  signal slaveLookupStb : std_logic;
  signal slaveLookupAddr : std_logic_vector(15 downto 0);
  signal slaveLookupData : std_logic_vector(7 downto 0);
  signal slaveLookupAck : std_logic;
 
  signal masterCyc : Array1(SWITCH_PORTS downto 0);
  signal masterStb : Array1(SWITCH_PORTS downto 0);
  signal masterWe : Array1(SWITCH_PORTS downto 0);
  signal masterAddr : Array10(SWITCH_PORTS downto 0);
  signal masterDataWrite : Array32(SWITCH_PORTS downto 0);
  signal masterDataRead : Array1(SWITCH_PORTS downto 0);
  signal masterAck : Array1(SWITCH_PORTS downto 0);
 
  signal slaveCyc : Array1(SWITCH_PORTS downto 0);
  signal slaveStb : Array1(SWITCH_PORTS downto 0);
  signal slaveWe : Array1(SWITCH_PORTS downto 0);
  signal slaveAddr : Array10(SWITCH_PORTS downto 0);
  signal slaveDataWrite : Array32(SWITCH_PORTS downto 0);
  signal slaveDataRead : Array1(SWITCH_PORTS downto 0);
  signal slaveAck : Array1(SWITCH_PORTS downto 0);
 
begin
 
  -----------------------------------------------------------------------------
  -- The routing table interconnect.
  -----------------------------------------------------------------------------
  RouteInterconnect: RouteTableInterconnect
    generic map(
      WIDTH=>SWITCH_PORTS+1)
    port map(
      clk=>clk, areset_n=>areset_n,
      stb_i=>masterLookupStb, addr_i=>masterLookupAddr,
      dataM_o=>masterLookupData, ack_o=>masterLookupAck,
      stb_o=>slaveLookupStb, addr_o=>slaveLookupAddr,
      dataS_i=>slaveLookupData, ack_i=>slaveLookupAck);
 
  -----------------------------------------------------------------------------
  -- The port interconnect.
  -----------------------------------------------------------------------------
  PortInterconnect: SwitchPortInterconnect
    generic map(
      WIDTH=>SWITCH_PORTS+1)
    port map(
      clk=>clk, areset_n=>areset_n,
      masterCyc_i=>masterCyc, masterStb_i=>masterStb, masterWe_i=>masterWe, masterAddr_i=>masterAddr,
      masterData_i=>masterDataWrite, masterData_o=>masterDataRead, masterAck_o=>masterAck,
      slaveCyc_o=>slaveCyc, slaveStb_o=>slaveStb, slaveWe_o=>slaveWe, slaveAddr_o=>slaveAddr,
      slaveData_o=>slaveDataWrite, slaveData_i=>slaveDataRead, slaveAck_i=>slaveAck);
 
  -----------------------------------------------------------------------------
  -- Data relaying port instantiation.
  -----------------------------------------------------------------------------
  PortGeneration: for portIndex in 0 to SWITCH_PORTS-1 generate
    PortInst: SwitchPort
      generic map(
        MAINTENANCE_LOOKUP=>false,
        PORT_INDEX=>portIndex)
      port map(
        clk=>clk, areset_n=>areset_n,
        masterCyc_o=>masterCyc(portIndex), masterStb_o=>masterStb(portIndex),
        masterWe_o=>masterWe(portIndex), masterAddr_o=>masterAddr(portIndex),
        masterData_o=>masterDataWrite(portIndex),
        masterData_i=>masterDataRead(portIndex), masterAck_i=>masterAck(portIndex),
        slaveCyc_i=>slaveCyc(portIndex), slaveStb_i=>slaveStb(portIndex),
        slaveWe_i=>slaveWe(portIndex), slaveAddr_i=>slaveAddr(portIndex),
        slaveData_i=>slaveDataWrite(portIndex),
        slaveData_o=>slaveDataRead(portIndex), slaveAck_o=>slaveAck(portIndex),
        lookupStb_o=>masterLookupStb(portIndex),
        lookupAddr_o=>masterLookupAddr(portIndex),
        lookupData_i=>masterLookupData(portIndex), lookupAck_i=>masterLookupAck(portIndex),
        readFrameEmpty_i=>readFrameEmpty_i(portIndex), readFrame_o=>readFrame_o(portIndex),
        readFrameRestart_o=>readFrameRestart_o(portIndex),
        readFrameAborted_i=>readFrameAborted_i(portIndex),
        readContentEmpty_i=>readContentEmpty_i(portIndex), readContent_o=>readContent_o(portIndex),
        readContentEnd_i=>readContentEnd_i(portIndex), readContentData_i=>readContentData_i(portIndex),
        writeFramePort_o=>open,
        writeFrameFull_i=>writeFrameFull_i(portIndex), writeFrame_o=>writeFrame_o(portIndex),
        writeFrameAbort_o=>writeFrameAbort_o(portIndex), writeContent_o=>writeContent_o(portIndex),
        writeContentData_o=>writeContentData_o(portIndex));
  end generate;
 
  -----------------------------------------------------------------------------
  -- Maintenance port instantiation.
  -----------------------------------------------------------------------------
  MaintenancePort: SwitchPortMaintenance
    generic map(
      SWITCH_PORTS=>SWITCH_PORTS,
      DEVICE_IDENTITY=>DEVICE_IDENTITY,
      DEVICE_VENDOR_IDENTITY=>DEVICE_VENDOR_IDENTITY,
      DEVICE_REV=>DEVICE_REV,
      ASSY_IDENTITY=>ASSY_IDENTITY,
      ASSY_VENDOR_IDENTITY=>ASSY_VENDOR_IDENTITY,
      ASSY_REV=>ASSY_REV)
    port map(
      clk=>clk, areset_n=>areset_n,
      lookupStb_i=>slaveLookupStb, lookupAddr_i=>slaveLookupAddr,
      lookupData_o=>slaveLookupData, lookupAck_o=>slaveLookupAck,
      masterCyc_o=>masterCyc(SWITCH_PORTS), masterStb_o=>masterStb(SWITCH_PORTS),
      masterWe_o=>masterWe(SWITCH_PORTS), masterAddr_o=>masterAddr(SWITCH_PORTS),
      masterData_o=>masterDataWrite(SWITCH_PORTS),
      masterData_i=>masterDataRead(SWITCH_PORTS), masterAck_i=>masterAck(SWITCH_PORTS),
      slaveCyc_i=>slaveCyc(SWITCH_PORTS), slaveStb_i=>slaveStb(SWITCH_PORTS),
      slaveWe_i=>slaveWe(SWITCH_PORTS), slaveAddr_i=>slaveAddr(SWITCH_PORTS),
      slaveData_i=>slaveDataWrite(SWITCH_PORTS),
      slaveData_o=>slaveDataRead(SWITCH_PORTS), slaveAck_o=>slaveAck(SWITCH_PORTS),
      lookupStb_o=>masterLookupStb(SWITCH_PORTS),
      lookupAddr_o=>masterLookupAddr(SWITCH_PORTS),
      lookupData_i=>masterLookupData(SWITCH_PORTS), lookupAck_i=>masterLookupAck(SWITCH_PORTS),
      portLinkTimeout_o=>portLinkTimeout_o,
      linkInitialized_i=>linkInitialized_i,
      outputPortEnable_o=>outputPortEnable_o, inputPortEnable_o=>inputPortEnable_o,
      localAckIdWrite_o=>localAckIdWrite_o, clrOutstandingAckId_o=>clrOutstandingAckId_o,
      inboundAckId_o=>inboundAckId_o, outstandingAckId_o=>outstandingAckId_o,
      outboundAckId_o=>outboundAckId_o, inboundAckId_i=>inboundAckId_i,
      outstandingAckId_i=>outstandingAckId_i, outboundAckId_i=>outboundAckId_i,
      configStb_o=>configStb_o, configWe_o=>configWe_o, configAddr_o=>configAddr_o,
      configData_o=>configData_o, configData_i=>configData_i, configAck_i=>configAck_i);
 
end architecture;
 
 
 
-------------------------------------------------------------------------------
-- SwitchPort.
-------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use work.rio_common.all;
 
 
-------------------------------------------------------------------------------
-- Entity for SwitchPort.
-------------------------------------------------------------------------------
entity SwitchPort is
  generic(
    MAINTENANCE_LOOKUP : boolean;
    PORT_INDEX : natural);
  port(
    clk : in std_logic;
    areset_n : in std_logic;
 
    -- Master port signals.
    -- Write frames to other ports.
    masterCyc_o : out std_logic;
    masterStb_o : out std_logic;
    masterWe_o : out std_logic;
    masterAddr_o : out std_logic_vector(9 downto 0);
    masterData_o : out std_logic_vector(31 downto 0);
    masterData_i : in std_logic;
    masterAck_i : in std_logic;
 
    -- Slave port signals.
    -- Receives frames from other ports.
    slaveCyc_i : in std_logic;
    slaveStb_i : in std_logic;
    slaveWe_i : in std_logic;
    slaveAddr_i : in std_logic_vector(9 downto 0);
    slaveData_i : in std_logic_vector(31 downto 0);
    slaveData_o : out std_logic;
    slaveAck_o : out std_logic;
 
    -- Address-lookup interface.
    lookupStb_o : out std_logic;
    lookupAddr_o : out std_logic_vector(15 downto 0);
    lookupData_i : in std_logic_vector(7 downto 0);
    lookupAck_i : in std_logic;
 
    -- Physical port frame buffer interface.
    readFrameEmpty_i : in std_logic;
    readFrame_o : out std_logic;
    readFrameRestart_o : out std_logic;
    readFrameAborted_i : in std_logic;
    readContentEmpty_i : in std_logic;
    readContent_o : out std_logic;
    readContentEnd_i : in std_logic;
    readContentData_i : in std_logic_vector(31 downto 0);
    writeFramePort_o : out std_logic_vector(7 downto 0);
    writeFrameFull_i : in std_logic;
    writeFrame_o : out std_logic;
    writeFrameAbort_o : out std_logic;
    writeContent_o : out std_logic;
    writeContentData_o : out std_logic_vector(31 downto 0));
end entity;
 
 
-------------------------------------------------------------------------------
-- Architecture for SwitchPort.
-------------------------------------------------------------------------------
architecture SwitchPortImpl of SwitchPort is
 
  type MasterStateType is (STATE_IDLE,
                           STATE_WAIT_HEADER_0, STATE_READ_HEADER_0,
                           STATE_READ_PORT_LOOKUP,
                           STATE_READ_TARGET_PORT,
                           STATE_WAIT_TARGET_PORT,
                           STATE_WAIT_TARGET_WRITE,
                           STATE_WAIT_COMPLETE);
  signal masterState : MasterStateType;
  alias ftype : std_logic_vector(3 downto 0) is readContentData_i(19 downto 16);
  alias tt : std_logic_vector(1 downto 0) is readContentData_i(21 downto 20);
 
  type SlaveStateType is (STATE_IDLE, STATE_SEND_ACK);
  signal slaveState : SlaveStateType;
 
begin
 
  -----------------------------------------------------------------------------
  -- Master interface process.
  -----------------------------------------------------------------------------
  Master: process(clk, areset_n)
  begin
    if (areset_n = '0') then
      masterState <= STATE_IDLE;
 
      lookupStb_o <= '0';
      lookupAddr_o <= (others => '0');
 
      masterCyc_o <= '0';
      masterStb_o <= '0';
      masterWe_o <= '0';
      masterAddr_o <= (others => '0');
      masterData_o <= (others => '0');
 
      readContent_o <= '0';
      readFrame_o <= '0';
      readFrameRestart_o <= '0';
    elsif (clk'event and clk = '1') then
      readContent_o <= '0';
      readFrame_o <= '0';
      readFrameRestart_o <= '0';
 
      case masterState is
 
        when STATE_IDLE =>
          ---------------------------------------------------------------------
          -- Wait for a new packet or content of a new packet.
          ---------------------------------------------------------------------
 
          -- Reset bus signals.
          masterCyc_o <= '0';
          masterStb_o <= '0';
 
          -- Wait for frame content to be available.
          -- Use different signals to trigger the forwarding of packets depending
          -- on the switch philosofy.
          if (readFrameEmpty_i = '0') then
            readContent_o <= '1';
            masterState <= STATE_WAIT_HEADER_0;
          end if;
 
        when STATE_WAIT_HEADER_0 =>
          ---------------------------------------------------------------------
          -- Wait for the frame buffer output to be updated.
          ---------------------------------------------------------------------
 
          -- Wait for frame buffer output to be updated.
          masterState <= STATE_READ_HEADER_0;
 
        when STATE_READ_HEADER_0 =>
          ---------------------------------------------------------------------
          -- Check the FTYPE and forward it to the maintenance port if it is a
          -- maintenance packet. Otherwise, initiate an address lookup and wait
          -- for the result.
          ---------------------------------------------------------------------
 
          -- Check if the frame has ended.
          if (readContentEnd_i = '0') then
            -- The frame has not ended.
            -- This word contains the header and the source id.
 
            -- Read the tt-field to check the source and destination id size.
            if (tt = "01") then
              -- This frame contains 16-bit addresses.
 
              -- Read the new content.
              readContent_o <= '1';
 
              -- Save the content of the header and destination.
              masterData_o <= readContentData_i;
 
              -- Check if this is a maintenance frame.
              if ((not MAINTENANCE_LOOKUP) and (ftype = FTYPE_MAINTENANCE_CLASS)) then
                -- This is a maintenance frame.
 
                -- Always route these frames to the maintenance module in the
                -- switch by setting the MSB bit of the port address.
                masterAddr_o <= '1' & std_logic_vector(to_unsigned(PORT_INDEX, 8)) & '0';
 
                -- Start an access to the maintenance port.
                masterState <= STATE_READ_TARGET_PORT;
              else
                -- This is not a maintenance frame.
 
                -- Lookup the destination address and proceed to wait for the
                -- result.
                lookupStb_o <= '1';
                lookupAddr_o <= readContentData_i(15 downto 0);
 
                -- Wait for the port lookup to return a result.
                masterState <= STATE_READ_PORT_LOOKUP;
              end if;
            else
              -- Unsupported tt-value, discard the frame.
              readFrame_o <= '1';
              masterState <= STATE_IDLE;
            end if;
          else
            -- End of frame.
            -- The frame is too short to contain a valid frame. Discard it.
            readFrame_o <= '1';
            masterState <= STATE_IDLE;
          end if;
 
        when STATE_READ_PORT_LOOKUP =>
          ---------------------------------------------------------------------
          -- Wait for the address lookup to be complete.
          ---------------------------------------------------------------------
 
          -- Wait for the routing table to complete the request.
          if (lookupAck_i = '1') then
            -- The address lookup is complete.
 
            -- Terminate the lookup cycle.
            lookupStb_o <= '0';
 
            -- Proceed to read the target port.
            masterAddr_o <= '0' & lookupData_i & '0';
            masterState <= STATE_READ_TARGET_PORT;
          else
            -- Wait until the address lookup is complete.
            -- REMARK: Timeout here???
          end if;
 
        when STATE_READ_TARGET_PORT =>
          ---------------------------------------------------------------------
          -- Initiate an access to the target port.
          ---------------------------------------------------------------------
 
          -- Read the status of the target port using the result from the
          -- lookup in the routing table.
          masterCyc_o <= '1';
          masterStb_o <= '1';
          masterWe_o <= '0';
          masterState <= STATE_WAIT_TARGET_PORT;
 
        when STATE_WAIT_TARGET_PORT =>
          ---------------------------------------------------------------------
          -- Wait to get access to the target port. When the port is ready
          -- check if it is ready to accept a new frame. If it cannot accept a
          -- new frame, terminate the access and go back and start a new one.
          -- This is to free the interconnect to let other ports access it if
          -- it is a shared bus. If the port is ready, initiate a write access
          -- to the selected port.
          ---------------------------------------------------------------------
 
          -- Wait for the target port to complete the request.
          if (masterAck_i = '1') then
            -- Target port has completed the request.
 
            -- Check the status of the target port.
            if (masterData_i = '0') then
              -- The target port has empty buffers to receive the frame.
 
              -- Hold the bus with cyc until the cycle is complete.
              -- Write the first word of the frame to the target port.
              -- The masterData_o has already been assigned.
              masterCyc_o <= '1';
              masterStb_o <= '1';
              masterWe_o <= '1';
              masterAddr_o(0) <= '1';
 
              -- Change state to transfer the frame.
              masterState <= STATE_WAIT_TARGET_WRITE;
            else
              -- The target port has no empty buffer to receive the frame.
              -- Terminate the cycle and retry later.
              masterCyc_o <= '0';
              masterStb_o <= '0';
              masterState <= STATE_READ_TARGET_PORT;
            end if;
          else
            -- Target port has not completed the request.
            -- Dont to anything.
          end if;
 
        when STATE_WAIT_TARGET_WRITE =>
          ---------------------------------------------------------------------
          -- Wait for the write access to complete. When complete, write the
          -- next content and update the content to the next. If the frame does
          -- not have any more data ready, terminate the access but keep the
          -- cycle active and proceed to wait for new data.
          ---------------------------------------------------------------------
 
          -- Wait for the target port to complete the request.
          -- REMARK: Remove the ack-condition to increase performance, we know
          -- that the write takes one cycle.
          if (masterAck_i = '1') then
            -- The target port is ready.
 
            -- Check if the frame has ended.
            if (readContentEnd_i = '0') then
              -- The frame has not ended.
 
              -- There are more data to transfer.
              masterData_o <= readContentData_i;
              readContent_o <= '1';
            else
              -- There are no more data to transfer.
 
              -- Update to the next frame.
              readFrame_o <= '1';
 
              -- Tell the target port that the frame is complete.
              masterWe_o <= '1';
              masterAddr_o(0) <= '0';
              masterData_o <= x"00000001";
 
              -- Change state to wait for the target port to finalize the write
              -- of the full frame.
              masterState <= STATE_WAIT_COMPLETE;
            end if;
          else
            -- Wait for the target port to reply.
            -- Dont do anything.
          end if;
 
        when STATE_WAIT_COMPLETE =>
          ---------------------------------------------------------------------
          -- Wait for the target port to signal that the frame has been
          -- completed.
          ---------------------------------------------------------------------
 
          -- Wait for the target port to complete the final request.
          if (masterAck_i = '1') then
            -- The target port has finalized the write of the frame.
 
            -- Reset master bus signals.
            masterCyc_o <= '0';
            masterStb_o <= '0';
            masterState <= STATE_IDLE;
          else
            -- Wait for the target port to reply.
            -- REMARK: Timeout here???
          end if;
 
        when others =>
          ---------------------------------------------------------------------
          -- 
          ---------------------------------------------------------------------
      end case;
    end if;
  end process;
 
  -----------------------------------------------------------------------------
  -- Slave interface process.
  -- Addr |  Read  | Write
  --    0 |  full  | abort & complete
  --    1 |  full  | frameData
  -----------------------------------------------------------------------------
  writeContentData_o <= slaveData_i;
  Slave: process(clk, areset_n)
  begin
    if (areset_n = '0') then
      slaveState <= STATE_IDLE;
 
      slaveData_o <= '0';
 
      writeFramePort_o <= (others=>'0');
      writeFrame_o <= '0';
      writeFrameAbort_o <= '0';
      writeContent_o <= '0';
    elsif (clk'event and clk = '1') then
      writeFrame_o <= '0';
      writeFrameAbort_o <= '0';
      writeContent_o <= '0';
 
      case slaveState is
 
        when STATE_IDLE =>
          ---------------------------------------------------------------------
          -- Wait for an access from a master.
          ---------------------------------------------------------------------
 
          -- Check if any cycle is active.
          if ((slaveCyc_i = '1') and (slaveStb_i = '1')) then
            -- Cycle is active.
 
            -- Check if the cycle is accessing the status- or data address.
            if (slaveAddr_i(0) = '0') then
              -- Accessing port status address.
 
              -- Check if writing.
              if (slaveWe_i = '1') then
                -- Writing the status address.
                -- Update the buffering output signals according to the input
                -- data.
                writeFramePort_o <= slaveAddr_i(8 downto 1);
                writeFrame_o <= slaveData_i(0);
                writeFrameAbort_o <= slaveData_i(1);
              else
                -- Reading the status address.
                slaveData_o <= writeFrameFull_i;
              end if;
            else
              -- Accessing port data address.
 
              -- Check if writing.
              if (slaveWe_i = '1') then
                -- Write frame content into the frame buffer.
                writeContent_o <= '1';
              else
                slaveData_o <= writeFrameFull_i;
              end if;
            end if;
 
            -- Change state to send an ack to the master.
            slaveState <= STATE_SEND_ACK;
          end if;
 
        when STATE_SEND_ACK =>
          ---------------------------------------------------------------------
          -- Wait for acknowledge to be received by the master.
          ---------------------------------------------------------------------
 
          -- Go back to the idle state and wait for a new cycle.
          slaveState <= STATE_IDLE;
 
        when others =>
          ---------------------------------------------------------------------
          -- 
          ---------------------------------------------------------------------
          null;
 
      end case;
    end if;
  end process;
 
  -- Assign the acknowledge depending on the current slave state.
  slaveAck_o <= '1' when (slaveState = STATE_SEND_ACK) else '0';
 
end architecture;
 
 
 
 
 
-------------------------------------------------------------------------------
-- SwitchPortMaintenance
-------------------------------------------------------------------------------
 
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use work.rio_common.all;
 
 
-------------------------------------------------------------------------------
-- Entity for SwitchPortMaintenance.
-------------------------------------------------------------------------------
entity SwitchPortMaintenance is
  generic(
    SWITCH_PORTS : natural range 0 to 255;
    DEVICE_IDENTITY : std_logic_vector(15 downto 0);
    DEVICE_VENDOR_IDENTITY : std_logic_vector(15 downto 0);
    DEVICE_REV : std_logic_vector(31 downto 0);
    ASSY_IDENTITY : std_logic_vector(15 downto 0);
    ASSY_VENDOR_IDENTITY : std_logic_vector(15 downto 0);
    ASSY_REV : std_logic_vector(15 downto 0));
  port(
    clk : in std_logic;
    areset_n : in std_logic;
 
    -- Routing table port lookup signals.
    lookupStb_i : in std_logic;
    lookupAddr_i : in std_logic_vector(15 downto 0);
    lookupData_o : out std_logic_vector(7 downto 0);
    lookupAck_o : out std_logic;
 
    -- Master port signals.
    -- Write frames to other ports.
    masterCyc_o : out std_logic;
    masterStb_o : out std_logic;
    masterWe_o : out std_logic;
    masterAddr_o : out std_logic_vector(9 downto 0);
    masterData_o : out std_logic_vector(31 downto 0);
    masterData_i : in std_logic;
    masterAck_i : in std_logic;
 
    -- Slave port signals.
    -- Receives frames from other ports.
    slaveCyc_i : in std_logic;
    slaveStb_i : in std_logic;
    slaveWe_i : in std_logic;
    slaveAddr_i : in std_logic_vector(9 downto 0);
    slaveData_i : in std_logic_vector(31 downto 0);
    slaveData_o : out std_logic;
    slaveAck_o : out std_logic;
 
    -- Address-lookup interface.
    lookupStb_o : out std_logic;
    lookupAddr_o : out std_logic_vector(15 downto 0);
    lookupData_i : in std_logic_vector(7 downto 0);
    lookupAck_i : in std_logic;
 
    -- Port common access interface.
    portLinkTimeout_o : out std_logic_vector(23 downto 0);
 
    -- Port specific access interface.
    linkInitialized_i : in Array1(SWITCH_PORTS-1 downto 0);
    outputPortEnable_o : out Array1(SWITCH_PORTS-1 downto 0);
    inputPortEnable_o : out Array1(SWITCH_PORTS-1 downto 0);
    localAckIdWrite_o : out Array1(SWITCH_PORTS-1 downto 0);
    clrOutstandingAckId_o : out Array1(SWITCH_PORTS-1 downto 0);
    inboundAckId_o : out Array5(SWITCH_PORTS-1 downto 0);
    outstandingAckId_o : out Array5(SWITCH_PORTS-1 downto 0);
    outboundAckId_o : out Array5(SWITCH_PORTS-1 downto 0);
    inboundAckId_i : in Array5(SWITCH_PORTS-1 downto 0);
    outstandingAckId_i : in Array5(SWITCH_PORTS-1 downto 0);
    outboundAckId_i : in Array5(SWITCH_PORTS-1 downto 0);
 
    -- Configuration space for implementation-defined space.
    configStb_o : out std_logic;
    configWe_o : out std_logic;
    configAddr_o : out std_logic_vector(23 downto 0);
    configData_o : out std_logic_vector(31 downto 0);
    configData_i : in std_logic_vector(31 downto 0);
    configAck_i : in std_logic);
end entity;
 
 
-------------------------------------------------------------------------------
-- Architecture for SwitchPort.
-------------------------------------------------------------------------------
architecture SwitchPortMaintenanceImpl of SwitchPortMaintenance is
 
  component SwitchPort is
    generic(
      MAINTENANCE_LOOKUP : boolean;
      PORT_INDEX : natural);
    port(
      clk : in std_logic;
      areset_n : in std_logic;
 
      masterCyc_o : out std_logic;
      masterStb_o : out std_logic;
      masterWe_o : out std_logic;
      masterAddr_o : out std_logic_vector(9 downto 0);
      masterData_o : out std_logic_vector(31 downto 0);
      masterData_i : in std_logic;
      masterAck_i : in std_logic;
 
      slaveCyc_i : in std_logic;
      slaveStb_i : in std_logic;
      slaveWe_i : in std_logic;
      slaveAddr_i : in std_logic_vector(9 downto 0);
      slaveData_i : in std_logic_vector(31 downto 0);
      slaveData_o : out std_logic;
      slaveAck_o : out std_logic;
 
      lookupStb_o : out std_logic;
      lookupAddr_o : out std_logic_vector(15 downto 0);
      lookupData_i : in std_logic_vector(7 downto 0);
      lookupAck_i : in std_logic;
 
      readFrameEmpty_i : in std_logic;
      readFrame_o : out std_logic;
      readFrameRestart_o : out std_logic;
      readFrameAborted_i : in std_logic;
      readContentEmpty_i : in std_logic;
      readContent_o : out std_logic;
      readContentEnd_i : in std_logic;
      readContentData_i : in std_logic_vector(31 downto 0);
      writeFramePort_o : out std_logic_vector(7 downto 0);
      writeFrameFull_i : in std_logic;
      writeFrame_o : out std_logic;
      writeFrameAbort_o : out std_logic;
      writeContent_o : out std_logic;
      writeContentData_o : out std_logic_vector(31 downto 0));
  end component;
 
  -----------------------------------------------------------------------------
  -- Signals between the port and the packet-queue.
  -----------------------------------------------------------------------------
 
  signal outboundFramePort, outboundFramePort0 : std_logic_vector(7 downto 0);
  signal outboundReadFrameEmpty : std_logic;
  signal outboundReadFrame : std_logic;
  signal outboundReadContent : std_logic;
  signal outboundReadContentEnd : std_logic;
  signal outboundReadContentData : std_logic_vector(31 downto 0);
  signal inboundFramePort, inboundFramePort0 : std_logic_vector(7 downto 0);
  signal inboundWriteFrameFull : std_logic;
  signal inboundWriteFrame : std_logic;
  signal inboundWriteFrameAbort : std_logic;
  signal inboundWriteContent : std_logic;
  signal inboundWriteContentData : std_logic_vector(31 downto 0);
 
  -----------------------------------------------------------------------------
  -- Signals between the packet-queue and RioLogicalCommon.
  -----------------------------------------------------------------------------
 
  signal inboundReadFrameEmpty : std_logic;
  signal inboundReadFrame : std_logic;
  signal inboundReadContent : std_logic;
  signal inboundReadContentEnd : std_logic;
  signal inboundReadContentData : std_logic_vector(31 downto 0);
  signal outboundWriteFrameFull : std_logic;
  signal outboundWriteFrame : std_logic;
  signal outboundWriteFrameAbort : std_logic;
  signal outboundWriteContent : std_logic;
  signal outboundWriteContentData : std_logic_vector(31 downto 0);
 
  -----------------------------------------------------------------------------
  -- Signals between RioLogicalCommon and PacketHandler.
  -----------------------------------------------------------------------------
 
  signal inboundStb : std_logic;
  signal inboundAdr : std_logic_vector(3 downto 0);
  signal inboundDat : std_logic_vector(31 downto 0);
  signal inboundStall : std_logic;
  signal outboundStb : std_logic_vector(0 downto 0);
  signal outboundAdr : std_logic_vector(0 downto 0);
  signal outboundDat : std_logic_vector(31 downto 0);
  signal outboundStall : std_logic_vector(0 downto 0);
 
  -----------------------------------------------------------------------------
  -- Signals between PacketHandlers and maintenance controllers.
  -----------------------------------------------------------------------------
 
  signal vc : std_logic;
  signal crf : std_logic;
  signal prio : std_logic_vector(1 downto 0);
  signal tt : std_logic_vector(1 downto 0);
  signal tid : std_logic_vector(7 downto 0);
  signal status : std_logic_vector(3 downto 0);
 
  signal readRequestInbound : std_logic;
  signal writeRequestInbound : std_logic;
  signal readResponseInbound : std_logic;
  signal writeResponseInbound : std_logic;
  signal portWriteInbound : std_logic;
  signal dstIdInbound : std_logic_vector(31 downto 0);
  signal srcIdInbound : std_logic_vector(31 downto 0);
  signal sizeInbound : std_logic_vector(3 downto 0);
  signal statusInbound : std_logic_vector(3 downto 0);
  signal hopInbound : std_logic_vector(7 downto 0);
  signal offsetInbound : std_logic_vector(20 downto 0);
  signal wdptrInbound: std_logic;
  signal payloadLengthInbound : std_logic_vector(2 downto 0);
  signal payloadIndexInbound : std_logic_vector(2 downto 0);
  signal payloadInbound : std_logic_vector(63 downto 0);
  signal doneInbound : std_logic;
 
  signal readRequestOutbound : std_logic;
  signal writeRequestOutbound : std_logic;
  signal readResponseOutbound : std_logic;
  signal writeResponseOutbound : std_logic;
  signal portWriteOutbound : std_logic;
  signal dstIdOutbound : std_logic_vector(31 downto 0);
  signal srcIdOutbound : std_logic_vector(31 downto 0);
  signal statusOutbound : std_logic_vector(3 downto 0);
  signal hopOutbound : std_logic_vector(7 downto 0);
  signal payloadLengthOutbound : std_logic_vector(2 downto 0);
  signal payloadIndexOutbound : std_logic_vector(2 downto 0);
  signal payloadOutbound : std_logic_vector(63 downto 0);
  signal doneOutbound : std_logic;
 
  signal readRequestMaint : std_logic;
  signal writeRequestMaint : std_logic;
  signal readResponseMaint : std_logic;
  signal writeResponseMaint : std_logic;
  signal statusMaint : std_logic_vector(3 downto 0);
  signal payloadLengthMaint : std_logic_vector(2 downto 0);
  signal payloadIndexMaint : std_logic_vector(2 downto 0);
  signal payloadMaint : std_logic_vector(63 downto 0);
  signal doneMaint : std_logic;
 
  -----------------------------------------------------------------------------
  -- 
  -----------------------------------------------------------------------------
 
  signal sendPacket : std_logic;
  signal forwardPacket : std_logic;
 
  -----------------------------------------------------------------------------
  -- Route table access signals.
  -----------------------------------------------------------------------------
 
  signal lookupEnable : std_logic;
  signal lookupAddress : std_logic_vector(10 downto 0);
  signal lookupData : std_logic_vector(7 downto 0);
  signal lookupAck : std_logic;
 
  signal routeTableEnable : std_logic;
  signal routeTableWrite : std_logic;
  signal routeTableAddress : std_logic_vector(10 downto 0);
  signal routeTablePortWrite : std_logic_vector(7 downto 0);
  signal routeTablePortRead : std_logic_vector(7 downto 0);
 
  signal routeTablePortDefault : std_logic_vector(7 downto 0);
 
  -----------------------------------------------------------------------------
  -- Configuration space signals.
  -----------------------------------------------------------------------------
 
  signal configStb, configStbInternal : std_logic;
  signal configWe : std_logic;
  signal configAdr : std_logic_vector(23 downto 0);
  signal configDataWrite : std_logic_vector(31 downto 0);
  signal configDataRead, configDataReadInternal : std_logic_vector(31 downto 0);
  signal configAck, configAckInternal : std_logic;
 
  signal discovered : std_logic;
  signal hostBaseDeviceIdLocked : std_logic;
  signal hostBaseDeviceId : std_logic_vector(15 downto 0);
  signal componentTag : std_logic_vector(31 downto 0);
  signal portLinkTimeout : std_logic_vector(23 downto 0);
  signal outputPortEnable : Array1(SWITCH_PORTS-1 downto 0);
  signal inputPortEnable : Array1(SWITCH_PORTS-1 downto 0);
 
begin
 
  -----------------------------------------------------------------------------
  -- Normal switch port instance interfacing the switch interconnect.
  -----------------------------------------------------------------------------
  -- Note that PORT_INDEX is not used in this instantiation and set to zero.
  PortInst: SwitchPort
    generic map(
      MAINTENANCE_LOOKUP=>true,
      PORT_INDEX=>0)
    port map(
      clk=>clk, areset_n=>areset_n,
      masterCyc_o=>masterCyc_o,
      masterStb_o=>masterStb_o,
      masterWe_o=>masterWe_o,
      masterAddr_o=>masterAddr_o,
      masterData_o=>masterData_o,
      masterData_i=>masterData_i,
      masterAck_i=>masterAck_i,
      slaveCyc_i=>slaveCyc_i,
      slaveStb_i=>slaveStb_i,
      slaveWe_i=>slaveWe_i,
      slaveAddr_i=>slaveAddr_i,
      slaveData_i=>slaveData_i,
      slaveData_o=>slaveData_o,
      slaveAck_o=>slaveAck_o,
      lookupStb_o=>open,
      lookupAddr_o=>open,
      lookupData_i=>outboundFramePort0,
      lookupAck_i=>'1',
      readFrameEmpty_i=>outboundReadFrameEmpty,
      readFrame_o=>outboundReadFrame,
      readFrameRestart_o=>open,
      readFrameAborted_i=>'0',
      readContentEmpty_i=>'0',
      readContent_o=>outboundReadContent,
      readContentEnd_i=>outboundReadContentEnd,
      readContentData_i=>outboundReadContentData,
      writeFramePort_o=>inboundFramePort0,
      writeFrameFull_i=>inboundWriteFrameFull,
      writeFrame_o=>inboundWriteFrame,
      writeFrameAbort_o=>inboundWriteFrameAbort,
      writeContent_o=>inboundWriteContent,
      writeContentData_o=>inboundWriteContentData);
 
  process(clk)
  begin
    if (clk'event and clk = '1') then
      if (inboundReadFrame = '1') then
        inboundFramePort <= inboundFramePort0;
      end if;
      if (outboundWriteFrame = '1') then
        outboundFramePort0 <= outboundFramePort;
      end if;
    end if;
  end process;
 
  -----------------------------------------------------------------------------
  -- Packet queue.
  -- This queue should only contain one packet.
  -----------------------------------------------------------------------------
  -- REMARK: Use a packet-buffer with a configurable maximum sized packet. The
  -- size of the resulting memory is larger than needed since maintenance
  -- packets never contain more than 8 double-words.
  PacketQueue: RioPacketBuffer
    generic map(SIZE_ADDRESS_WIDTH=>1, CONTENT_ADDRESS_WIDTH=>7)
    port map(
      clk=>clk, areset_n=>areset_n,
      inboundWriteFrameFull_o=>inboundWriteFrameFull,
      inboundWriteFrame_i=>inboundWriteFrame,
      inboundWriteFrameAbort_i=>inboundWriteFrameAbort,
      inboundWriteContent_i=>inboundWriteContent,
      inboundWriteContentData_i=>inboundWriteContentData,
      inboundReadFrameEmpty_o=>inboundReadFrameEmpty,
      inboundReadFrame_i=>inboundReadFrame,
      inboundReadFrameRestart_i=>'0',
      inboundReadFrameAborted_o=>open,
      inboundReadContentEmpty_o=>open,
      inboundReadContent_i=>inboundReadContent,
      inboundReadContentEnd_o=>inboundReadContentEnd,
      inboundReadContentData_o=>inboundReadContentData,
      outboundWriteFrameFull_o=>outboundWriteFrameFull,
      outboundWriteFrame_i=>outboundWriteFrame,
      outboundWriteFrameAbort_i=>outboundWriteFrameAbort,
      outboundWriteContent_i=>outboundWriteContent,
      outboundWriteContentData_i=>outboundWriteContentData,
      outboundReadFrameEmpty_o=>outboundReadFrameEmpty,
      outboundReadFrame_i=>outboundReadFrame,
      outboundReadFrameRestart_i=>'0',
      outboundReadFrameAborted_o=>open,
      outboundReadContentEmpty_o=>open,
      outboundReadContent_i=>outboundReadContent,
      outboundReadContentEnd_o=>outboundReadContentEnd,
      outboundReadContentData_o=>outboundReadContentData);
 
  -----------------------------------------------------------------------------
  -- Logical common packet parser.
  -- This module removes CRC and unpack addresses in the inbound direction and
  -- adds CRC and packs addresses in the outbound direction.
  -----------------------------------------------------------------------------
  LogicalCommon: RioLogicalCommon
    generic map(PORTS=>1)
    port map(
      clk=>clk, areset_n=>areset_n, enable=>'1',
      readFrameEmpty_i=>inboundReadFrameEmpty,
      readFrame_o=>inboundReadFrame,
      readContent_o=>inboundReadContent,
      readContentEnd_i=>inboundReadContentEnd,
      readContentData_i=>inboundReadContentData,
      writeFrameFull_i=>outboundWriteFrameFull,
      writeFrame_o=>outboundWriteFrame,
      writeFrameAbort_o=>outboundWriteFrameAbort,
      writeContent_o=>outboundWriteContent,
      writeContentData_o=>outboundWriteContentData,
      inboundStb_o=>inboundStb,
      inboundAdr_o=>inboundAdr,
      inboundDat_o=>inboundDat,
      inboundStall_i=>inboundStall,
      outboundStb_i=>outboundStb,
      outboundAdr_i=>outboundAdr,
      outboundDat_i=>outboundDat,
      outboundStall_o=>outboundStall);
 
  -----------------------------------------------------------------------------
  -- Inbound maintenance packet parser.
  -- Unpack inbound maintenance packets.
  -----------------------------------------------------------------------------
  payloadIndexInbound <= payloadIndexOutbound when (forwardPacket = '1') else payloadIndexMaint;
  doneInbound <= doneOutbound when (forwardPacket = '1') else doneMaint;
  InboundPacket: MaintenanceInbound
    port map(
      clk=>clk, areset_n=>areset_n, enable=>'1',
      readRequestReady_o=>readRequestInbound,
      writeRequestReady_o=>writeRequestInbound,
      readResponseReady_o=>readResponseInbound,
      writeResponseReady_o=>writeResponseInbound,
      portWriteReady_o=>portWriteInbound,
      vc_o=>vc,
      crf_o=>crf,
      prio_o=>prio,
      tt_o=>tt,
      dstid_o=>dstIdInbound,
      srcid_o=>srcIdInbound,
      size_o=>sizeInbound,
      status_o=>statusInbound,
      tid_o=>tid,
      hop_o=>hopInbound,
      offset_o=>offsetInbound,
      wdptr_o=>wdptrInbound,
      payloadLength_o=>payloadLengthInbound,
      payloadIndex_i=>payloadIndexInbound,
      payload_o=>payloadInbound,
      done_i=>doneInbound,
      inboundStb_i=>inboundStb,
      inboundAdr_i=>inboundAdr,
      inboundDat_i=>inboundDat,
      inboundStall_o=>inboundStall);
 
  -----------------------------------------------------------------------------
  -- Outbound maintenance packet generator.
  -----------------------------------------------------------------------------
  readRequestOutbound <= (readRequestInbound and sendPacket) when (forwardPacket = '1') else '0';
  writeRequestOutbound <= (writeRequestInbound and sendPacket) when (forwardPacket = '1') else '0';
  readResponseOutbound <= (readResponseInbound and sendPacket) when (forwardPacket = '1') else readResponseMaint;
  writeResponseOutbound <= (writeResponseInbound and sendPacket) when (forwardPacket = '1') else writeResponseMaint;
  portWriteOutbound <= (portWriteInbound and sendPacket) when (forwardPacket = '1') else '0';
  srcIdOutbound <= srcIdInbound when (forwardPacket = '1') else dstIdInbound;
  dstIdOutbound <= dstIdInbound when (forwardPacket = '1') else srcIdInbound;
  statusOutbound <= statusInbound when (forwardPacket = '1') else statusMaint;
  hopOutbound <= std_logic_vector(unsigned(hopInbound)-1) when (forwardPacket = '1') else x"ff";
  payloadLengthOutbound <= payloadLengthInbound when (forwardPacket = '1') else payloadLengthMaint;
  payloadOutbound <= payloadInbound when (forwardPacket = '1') else payloadMaint;
  OutboundPacket: MaintenanceOutbound
    port map(
      clk=>clk, areset_n=>areset_n, enable=>'1',
      readRequestReady_i=>readRequestOutbound,
      writeRequestReady_i=>writeRequestOutbound,
      readResponseReady_i=>readResponseOutbound,
      writeResponseReady_i=>writeResponseOutbound,
      portWriteReady_i=>portWriteOutbound,
      vc_i=>vc,
      crf_i=>crf,
      prio_i=>prio,
      tt_i=>tt,
      dstid_i=>dstIdOutbound,
      srcid_i=>srcIdOutbound,
      size_i=>sizeInbound,
      status_i=>statusOutbound,
      tid_i=>tid,
      hop_i=>hopOutbound,
      offset_i=>offsetInbound,
      wdptr_i=>wdptrInbound,
      payloadLength_i=>payloadLengthOutbound,
      payloadIndex_o=>payloadIndexOutbound,
      payload_i=>payloadOutbound,
      done_o=>doneOutbound,
      outboundStb_o=>outboundStb(0),
      outboundAdr_o=>outboundAdr(0),
      outboundDat_o=>outboundDat,
      outboundStall_i=>outboundStall(0));
 
  -----------------------------------------------------------------------------
  -- Main switch maintenance controller.
  -- This controller decides when to forward packets and when to consume and
  -- produce responses instead.
  -- It also determines when portWrite-packets are allowed to be sent.
  -----------------------------------------------------------------------------
  RioSwitchMaintenance: process(clk, areset_n)
    type MasterStateType is (STATE_IDLE,
                             STATE_START_PORT_LOOKUP,
                             STATE_WAIT_PORT_LOOKUP,
                             STATE_WAIT_COMPLETE);
    variable masterState : MasterStateType;
  begin
    if (areset_n = '0') then
      masterState := STATE_IDLE;
 
      sendPacket <= '0';
      forwardPacket <= '0';
      outboundFramePort <= (others=>'0');
 
      lookupStb_o <= '0';
      lookupAddr_o <= (others => '0');
    elsif (clk'event and clk = '1') then
      case masterState is
 
        when STATE_IDLE =>
          ---------------------------------------------------------------------
          -- Wait for frame to be available.
          ---------------------------------------------------------------------
          -- REMARK: Discard erronous frames.
          sendPacket <= '0';
          if (((readRequestInbound = '1') or (writeRequestInbound = '1')) and (hopInbound = x"00")) then
            masterState := STATE_WAIT_COMPLETE;
            forwardPacket <= '0';
            outboundFramePort <= inboundFramePort;
          elsif ((readResponseInbound = '1') or
                 ((readRequestInbound = '1') and (hopInbound /= x"00")) or
                 (writeResponseInbound = '1') or
                 ((writeRequestInbound = '1') and (hopInbound /= x"00")) or
                 (portWriteInbound = '1')) then
            masterState := STATE_START_PORT_LOOKUP;
            forwardPacket <= '1';
          end if;
 
        when STATE_START_PORT_LOOKUP =>
          ---------------------------------------------------------------------
          -- The destination port of the packet should be read from the routing
          -- table.
          ---------------------------------------------------------------------
 
          -- Initiate a port-lookup of the destination address.
          lookupStb_o <= '1';
          lookupAddr_o <= dstIdInbound(15 downto 0);
          masterState := STATE_WAIT_PORT_LOOKUP;
 
        when STATE_WAIT_PORT_LOOKUP =>
          ---------------------------------------------------------------------
          -- Wait for the destination port lookup to complete.
          ---------------------------------------------------------------------
 
          if (lookupAck_i = '1') then
            -- The address lookup is complete.
 
            -- Terminate the lookup cycle.
            lookupStb_o <= '0';
 
            -- Wait for the target port to reply.
            outboundFramePort <= lookupData_i;
            masterState := STATE_WAIT_COMPLETE;
          else
            -- Wait until the address lookup is complete.
            -- REMARK: Timeout here???
          end if;
 
        when STATE_WAIT_COMPLETE =>
          ---------------------------------------------------------------------
          -- Indicate that the packet can be sent and wait for it to be
          -- transmitted.
          ---------------------------------------------------------------------
          sendPacket <= '1';
          if (doneInbound = '1') then
            masterState := STATE_IDLE;
          end if;
 
        when others =>
          ---------------------------------------------------------------------
          -- 
          ---------------------------------------------------------------------
      end case;
    end if;
  end process;
 
  -----------------------------------------------------------------------------
  -- Bridge between the inbound RapidIO maintenance packets to the internal
  -- config-space bus.
  -----------------------------------------------------------------------------
  readRequestMaint <= (readRequestInbound and sendPacket) when (forwardPacket = '0') else '0';
  writeRequestMaint <= (writeRequestInbound and sendPacket) when (forwardPacket = '0') else '0';
  MaintenanceBridge: RioLogicalMaintenance
    port map(
      clk=>clk, areset_n=>areset_n, enable=>'1',
      readRequestReady_i=>readRequestMaint,
      writeRequestReady_i=>writeRequestMaint,
      size_i=>sizeInbound,
      offset_i=>offsetInbound,
      wdptr_i=>wdptrInbound,
      payloadLength_i=>payloadLengthInbound,
      payloadIndex_o=>payloadIndexMaint,
      payload_i=>payloadInbound,
      done_o=>doneMaint,
      readResponseReady_o=>readResponseMaint,
      writeResponseReady_o=>writeResponseMaint,
      status_o=>statusMaint,
      payloadLength_o=>payloadLengthMaint,
      payloadIndex_i=>payloadIndexOutbound,
      payload_o=>payloadMaint,
      done_i=>doneOutbound,
      configStb_o=>configStb,
      configWe_o=>configWe,
      configAdr_o=>configAdr(23 downto 2),
      configDat_o=>configDataWrite,
      configDat_i=>configDataRead,
      configAck_i=>configAck);
  configAdr(1 downto 0) <= "00";
 
  -----------------------------------------------------------------------------
  -- Switch configuration memory.
  -----------------------------------------------------------------------------
  portLinkTimeout_o <= portLinkTimeout;
  outputPortEnable_o <= outputPortEnable;
  inputPortEnable_o <= inputPortEnable;
 
  configStb_o <= '1' when ((configStb = '1') and (configAdr(23 downto 16) /= x"00")) else '0';
  configStbInternal <= '1' when ((configStb = '1') and (configAdr(23 downto 16) = x"00")) else '0';
  configWe_o <= configWe;
  configAddr_o <= configAdr;
  configData_o <= configDataWrite;
  configDataRead <= configData_i when (configStbInternal = '0') else configDataReadInternal;
  configAck <= configAck_i when (configStbInternal = '0') else configAckInternal;
 
  ConfigMemory: process(areset_n, clk)
  begin
    if (areset_n = '0') then
      configDataReadInternal <= (others => '0');
      configAckInternal <= '0';
 
      routeTableEnable <= '1';
      routeTableWrite <= '0';
      routeTableAddress <= (others => '0');
      routeTablePortWrite <= (others => '0');
      routeTablePortDefault <= (others => '0');
 
      discovered <= '0';
 
      hostBaseDeviceIdLocked <= '0';
      hostBaseDeviceId <= (others => '1');
      componentTag <= (others => '0');
 
      portLinkTimeout <= (others => '1');
 
      -- REMARK: These should be set to zero when a port gets initialized...
      outputPortEnable <= (others => '0');
      inputPortEnable <= (others => '0');
 
      localAckIdWrite_o <= (others => '0');
    elsif (clk'event and clk = '1') then
      routeTableWrite <= '0';
      localAckIdWrite_o <= (others => '0');
 
      if (configAckInternal = '0') then
        if (configStbInternal = '1') then
          configAckInternal <= '1';
 
          -- Check if the access is into implementation defined space or if the
          -- access should be handled here.
          if (configAdr(23 downto 16) /= x"00") then
            -- Accessing implementation defined space.
            -- Make an external access and return the resonse.
            configDataReadInternal <= (others=>'0');
          else
            -- Access should be handled here.
 
            case (configAdr) is
              when x"000000" =>
                -----------------------------------------------------------------
                -- Device Identity CAR. Read-only.
                -----------------------------------------------------------------
 
                configDataReadInternal(31 downto 16) <= DEVICE_IDENTITY;
                configDataReadInternal(15 downto 0) <= DEVICE_VENDOR_IDENTITY;
 
              when x"000004" =>
                -----------------------------------------------------------------
                -- Device Information CAR. Read-only.
                -----------------------------------------------------------------
 
                configDataReadInternal(31 downto 0) <= DEVICE_REV;
 
              when x"000008" =>
                -----------------------------------------------------------------
                -- Assembly Identity CAR. Read-only.
                -----------------------------------------------------------------
 
                configDataReadInternal(31 downto 16) <= ASSY_IDENTITY;
                configDataReadInternal(15 downto 0) <= ASSY_VENDOR_IDENTITY;
 
              when x"00000c" =>
                -----------------------------------------------------------------
                -- Assembly Informaiton CAR. Read-only.
                -----------------------------------------------------------------
 
                configDataReadInternal(31 downto 16) <= ASSY_REV;
                configDataReadInternal(15 downto 0) <= x"0100";
 
              when x"000010" =>
                -----------------------------------------------------------------
                -- Processing Element Features CAR. Read-only.
                -----------------------------------------------------------------
 
                -- Bridge.
                configDataReadInternal(31) <= '0';
 
                -- Memory.
                configDataReadInternal(30) <= '0';
 
                -- Processor.
                configDataReadInternal(29) <= '0';
 
                -- Switch.
                configDataReadInternal(28) <= '1';
 
                -- Reserved.
                configDataReadInternal(27 downto 10) <= (others => '0');
 
                -- Extended route table configuration support.
                configDataReadInternal(9) <= '0';
 
                -- Standard route table configuration support.
                configDataReadInternal(8) <= '1';
 
                -- Reserved.
                configDataReadInternal(7 downto 5) <= (others => '0');
 
                -- Common transport large system support.
                configDataReadInternal(4) <= '1';
 
                -- Extended features.
                configDataReadInternal(3) <= '1';
 
                -- Extended addressing support.
                -- Not a processing element.
                configDataReadInternal(2 downto 0) <= "000";
 
              when x"000014" =>
                -----------------------------------------------------------------
                -- Switch Port Information CAR. Read-only.
                -----------------------------------------------------------------
 
                -- Reserved.
                configDataReadInternal(31 downto 16) <= (others => '0');
 
                -- PortTotal.
                configDataReadInternal(15 downto 8) <=
                  std_logic_vector(to_unsigned(SWITCH_PORTS, 8));
 
                -- PortNumber.
                configDataReadInternal(7 downto 0) <= inboundFramePort;
 
              when x"000034" =>
                -----------------------------------------------------------------
                -- Switch Route Table Destination ID Limit CAR.
                -----------------------------------------------------------------
 
                -- Max_destId.
                -- Support 2048 addresses.
                configDataReadInternal(15 downto 0) <= x"0800";
 
              when x"000068" =>
                -----------------------------------------------------------------
                -- Host Base Device ID Lock CSR.
                -----------------------------------------------------------------
 
                if (configWe = '1') then
                  -- Check if this field has been written before.
                  if (hostBaseDeviceIdLocked = '0') then
                    -- The field has not been written.
                    -- Lock the field and set the host base device id.
                    hostBaseDeviceIdLocked <= '1';
                    hostBaseDeviceId <= configDataWrite(15 downto 0);
                  else
                    -- The field has been written.
                    -- Check if the written data is the same as the stored.
                    if (hostBaseDeviceId = configDataWrite(15 downto 0)) then
                      -- Same as stored, reset the value to its initial value.
                      hostBaseDeviceIdLocked <= '0';
                      hostBaseDeviceId <= (others => '1');
                    else
                      -- Not writing the same as the stored value.
                      -- Ignore the write.
                    end if;
                  end if;
                end if;
 
                configDataReadInternal(31 downto 16) <= (others => '0');
                configDataReadInternal(15 downto 0) <= hostBaseDeviceId;
 
              when x"00006c" =>
                -----------------------------------------------------------------
                -- Component TAG CSR.
                -----------------------------------------------------------------
 
                if (configWe = '1') then
                  componentTag <= configDataWrite;
                end if;
 
                configDataReadInternal <= componentTag;
 
              when x"000070" =>
                -----------------------------------------------------------------
                -- Standard Route Configuration Destination ID Select CSR.
                -----------------------------------------------------------------             
 
                if (configWe = '1') then
                  -- Write the address to access the routing table.
                  routeTableAddress <= configDataWrite(10 downto 0);
                end if;
 
                configDataReadInternal(31 downto 11) <= (others => '0');
                configDataReadInternal(10 downto 0) <= routeTableAddress;
 
              when x"000074" =>
                -----------------------------------------------------------------
                -- Standard Route Configuration Port Select CSR.
                -----------------------------------------------------------------
 
                if (configWe = '1') then
                  -- Write the port information for the address selected by the
                  -- above register.
                  routeTableWrite <= '1';
                  routeTablePortWrite <= configDataWrite(7 downto 0);
                end if;
 
                configDataReadInternal(31 downto 8) <= (others => '0');
                configDataReadInternal(7 downto 0) <= routeTablePortRead;
 
              when x"000078" =>
                -----------------------------------------------------------------
                -- Standard Route Default Port CSR.
                -----------------------------------------------------------------
 
                if (configWe = '1') then
                  -- Write the default route device id.
                  routeTablePortDefault <= configDataWrite(7 downto 0);
                end if;
 
                configDataReadInternal(31 downto 8) <= (others => '0');
                configDataReadInternal(7 downto 0) <= routeTablePortDefault;
 
              when x"000100" =>
                -----------------------------------------------------------------
                -- Extended features. LP-Serial Register Block Header.
                -----------------------------------------------------------------
 
                -- One feature only, 0x0003=Generic End Point Free Device.
                configDataReadInternal(31 downto 16) <= x"0000";
                configDataReadInternal(15 downto 0) <= x"0003";
 
              when x"000120" =>
                -----------------------------------------------------------------
                -- Port Link Timeout Control CSR.
                -----------------------------------------------------------------
 
                if (configWe = '1') then
                  portLinkTimeout <= configDataWrite(31 downto 8);
                end if;
 
                configDataReadInternal(31 downto 8) <= portLinkTimeout;
                configDataReadInternal(7 downto 0) <= x"00";
 
              when x"00013c" =>
                -----------------------------------------------------------------
                -- Port General Control CSR.
                -----------------------------------------------------------------
 
                if (configWe = '1') then
                  discovered <= configDataWrite(29);
                end if;
 
                configDataReadInternal(31 downto 30) <= "00";
                configDataReadInternal(29) <= discovered;
                configDataReadInternal(28 downto 0) <= (others => '0');
 
              when others =>
                -----------------------------------------------------------------
                -- Other port specific registers.
                -----------------------------------------------------------------
 
                -- Make sure the output is always set to something.
                configDataReadInternal <= (others=>'0');
 
                -- Iterate through all active ports.
                for portIndex in 0 to SWITCH_PORTS-1 loop
 
                  if(unsigned(configAdr) = (x"000148" + (x"000020"*portIndex))) then
                    -----------------------------------------------------------------
                    -- Port N Local ackID CSR.
                    -----------------------------------------------------------------
                    if (configWe = '1') then
                      localAckIdWrite_o(portIndex) <= '1';
                      clrOutstandingAckId_o(portIndex) <= configDataWrite(31);
                      inboundAckId_o(portIndex) <= configDataWrite(28 downto 24);
                      outstandingAckId_o(portIndex) <= configDataWrite(12 downto 8);
                      outboundAckId_o(portIndex) <= configDataWrite(4 downto 0);
                    end if;
                    configDataReadInternal(31 downto 29) <= (others => '0');
                    configDataReadInternal(28 downto 24) <= inboundAckId_i(portIndex);
                    configDataReadInternal(23 downto 13) <= (others => '0');
                    configDataReadInternal(12 downto 8) <= outstandingAckId_i(portIndex);
                    configDataReadInternal(7 downto 5) <= (others => '0');
                    configDataReadInternal(4 downto 0) <= outboundAckId_i(portIndex);
 
                  elsif(unsigned(configAdr) = (x"000154" + (x"000020"*portIndex))) then
                    -----------------------------------------------------------------
                    -- Port N Control 2 CSR.
                    -----------------------------------------------------------------
                    configDataReadInternal <= (others => '0');
 
                  elsif(unsigned(configAdr) = (x"000158" + (x"000020"*portIndex))) then
                    -----------------------------------------------------------------
                    -- Port N Error and Status CSR.
                    -----------------------------------------------------------------
                    -- Idle Sequence 2 Support.
                    configDataReadInternal(31) <= '0';
 
                    -- Idle Sequence 2 Enable.
                    configDataReadInternal(30) <= '0';
 
                    -- Idle Sequence.
                    configDataReadInternal(29) <= '0';
 
                    -- Reserved.
                    configDataReadInternal(28) <= '0';
 
                    -- Flow Control Mode.
                    configDataReadInternal(27) <= '0';
 
                    -- Reserved.
                    configDataReadInternal(26 downto 21) <= (others => '0');
 
                    -- Output retry-encountered.
                    configDataReadInternal(20) <= '0';
 
                    -- Output retried.
                    configDataReadInternal(19) <= '0';
 
                    -- Output retried-stopped.
                    configDataReadInternal(18) <= '0';
 
                    -- Output error-encountered.
                    configDataReadInternal(17) <= '0';
 
                    -- Output error-stopped.
                    configDataReadInternal(16) <= '0';
 
                    -- Reserved.
                    configDataReadInternal(15 downto 11) <= (others => '0');
 
                    -- Input retry-stopped.
                    configDataReadInternal(10) <= '0';
 
                    -- Input error-encountered.
                    configDataReadInternal(9) <= '0';
 
                    -- Input error-stopped.
                    configDataReadInternal(8) <= '0';
 
                    -- Reserved.
                    configDataReadInternal(7 downto 5) <= (others => '0');
 
                    -- Port-write pending.
                    configDataReadInternal(4) <= '0';
 
                    -- Port unavailable.
                    configDataReadInternal(3) <= '0';
 
                    -- Port error.
                    configDataReadInternal(2) <= '0';
 
                    -- Port OK.
                    configDataReadInternal(1) <= linkInitialized_i(portIndex);
 
                    -- Port uninitialized.
                    configDataReadInternal(0) <= not linkInitialized_i(portIndex);
 
                  elsif(unsigned(configAdr) = (x"00015c" + (x"000020"*portIndex))) then
                    -----------------------------------------------------------------
                    -- Port N Control CSR.
                    -----------------------------------------------------------------
 
                    -- Port Width Support.
                    configDataReadInternal(31 downto 30) <= (others=>'0');
 
                    -- Initialized Port Width.
                    configDataReadInternal(29 downto 27) <= (others=>'0');
 
                    -- Port Width Override.
                    configDataReadInternal(26 downto 24) <= (others=>'0');
 
                    -- Port disable.
                    configDataReadInternal(23) <= '0';
 
                    -- Output Port Enable.
                    if (configWe = '1') then
                      outputPortEnable(portIndex) <= configDataWrite(22);
                    end if;
                    configDataReadInternal(22) <= outputPortEnable(portIndex);
 
                    -- Input Port Enable.
                    if (configWe = '1') then
                      inputPortEnable(portIndex) <= configDataWrite(21);
                    end if;
                    configDataReadInternal(21) <= inputPortEnable(portIndex);
 
                    -- Error Checking Disabled.
                    configDataReadInternal(20) <= '0';
 
                    -- Multicast-event Participant.
                    configDataReadInternal(19) <= '0';
 
                    -- Reserved.
                    configDataReadInternal(18) <= '0';
 
                    -- Enumeration Boundry.
                    configDataReadInternal(17) <= '0';
 
                    -- Reserved.
                    configDataReadInternal(16) <= '0';
 
                    -- Extended Port Width Override.
                    configDataReadInternal(15 downto 14) <= (others=>'0');
 
                    -- Extended Port Width Support.
                    configDataReadInternal(13 downto 12) <= (others=>'0');
 
                    -- Implementation defined.
                    configDataReadInternal(11 downto 4) <= (others=>'0');
 
                    -- Reserved.
                    configDataReadInternal(3 downto 1) <= (others=>'0');
 
                    -- Port Type.
                    configDataReadInternal(0) <= '1';
                  end if;
                end loop;
 
            end case;
          end if;
        else
          -- Config memory not enabled.
        end if;
      else
        configAckInternal <= '0';
      end if;
    end if;
  end process;
 
  -----------------------------------------------------------------------------
  -- Logic implementing the routing table access.
  -----------------------------------------------------------------------------
 
  -- Lookup interface port memory signals.
  lookupEnable <= '1' when (lookupStb_i = '1') and (lookupAddr_i(15 downto 11) = "00000") else '0';
  lookupAddress <= lookupAddr_i(10 downto 0);
  lookupData_o <= lookupData when (lookupEnable = '1') else routeTablePortDefault;
  lookupAck_o <= lookupAck;
  LookupProcess: process(clk, areset_n)
  begin
    if (areset_n = '0') then
      lookupAck <= '0';
    elsif (clk'event and clk = '1') then
      if ((lookupStb_i = '1') and (lookupAck = '0')) then
        lookupAck <= '1';
      else
        lookupAck <= '0';
      end if;
    end if;
  end process;
 
  -- Dual port memory containing the routing table.
  RoutingTable: MemoryDualPort
    generic map(
      ADDRESS_WIDTH=>11, DATA_WIDTH=>8)
    port map(
      clkA_i=>clk, enableA_i=>routeTableEnable, writeEnableA_i=>routeTableWrite,
      addressA_i=>routeTableAddress,
      dataA_i=>routeTablePortWrite, dataA_o=>routeTablePortRead,
      clkB_i=>clk, enableB_i=>lookupEnable,
      addressB_i=>lookupAddress, dataB_o=>lookupData);
 
end architecture;
 
 
-------------------------------------------------------------------------------
-- 
-------------------------------------------------------------------------------
 
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use work.rio_common.all;
 
 
-------------------------------------------------------------------------------
-- 
-------------------------------------------------------------------------------
entity RouteTableInterconnect is
  generic(
    WIDTH : natural range 1 to 256 := 8);
  port(
    clk : in std_logic;
    areset_n : in std_logic;
 
    stb_i : in Array1(WIDTH-1 downto 0);
    addr_i : in Array16(WIDTH-1 downto 0);
    dataM_o : out Array8(WIDTH-1 downto 0);
    ack_o : out Array1(WIDTH-1 downto 0);
 
    stb_o : out std_logic;
    addr_o : out std_logic_vector(15 downto 0);
    dataS_i : in std_logic_vector(7 downto 0);
    ack_i : in std_logic);
end entity;
 
 
-------------------------------------------------------------------------------
-- 
-------------------------------------------------------------------------------
architecture RouteTableInterconnectImpl of RouteTableInterconnect is
  signal activeCycle : std_logic;
  signal selectedMaster : natural range 0 to WIDTH-1;
begin
 
  -----------------------------------------------------------------------------
  -- Arbitration.
  -----------------------------------------------------------------------------
  Arbiter: process(areset_n, clk)
  begin
    if (areset_n = '0') then
      activeCycle <= '0';
      selectedMaster <= 0;
    elsif (clk'event and clk = '1') then
      if (activeCycle = '0') then
        for i in 0 to WIDTH-1 loop
          if (stb_i(i) = '1') then
            activeCycle <= '1';
            selectedMaster <= i;
          end if;
        end loop;
      else
        if (stb_i(selectedMaster) = '0') then
          activeCycle <= '0';
        end if;
      end if;
    end if;
  end process;
 
  -----------------------------------------------------------------------------
  -- Interconnection.
  -----------------------------------------------------------------------------
  stb_o <= stb_i(selectedMaster);
  addr_o <= addr_i(selectedMaster);
 
  Interconnect: for i in 0 to WIDTH-1 generate
    dataM_o(i) <= dataS_i;
    ack_o(i) <= ack_i when (selectedMaster = i) else '0';
  end generate;
 
end architecture;
 
 
-------------------------------------------------------------------------------
-- 
-------------------------------------------------------------------------------
 
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use work.rio_common.all;
 
 
-------------------------------------------------------------------------------
-- 
-------------------------------------------------------------------------------
entity SwitchPortInterconnect is
  generic(
    WIDTH : natural range 1 to 256 := 8);
  port(
    clk : in std_logic;
    areset_n : in std_logic;
 
    masterCyc_i : in Array1(WIDTH-1 downto 0);
    masterStb_i : in Array1(WIDTH-1 downto 0);
    masterWe_i : in Array1(WIDTH-1 downto 0);
    masterAddr_i : in Array10(WIDTH-1 downto 0);
    masterData_i : in Array32(WIDTH-1 downto 0);
    masterData_o : out Array1(WIDTH-1 downto 0);
    masterAck_o : out Array1(WIDTH-1 downto 0);
 
    slaveCyc_o : out Array1(WIDTH-1 downto 0);
    slaveStb_o : out Array1(WIDTH-1 downto 0);
    slaveWe_o : out Array1(WIDTH-1 downto 0);
    slaveAddr_o : out Array10(WIDTH-1 downto 0);
    slaveData_o : out Array32(WIDTH-1 downto 0);
    slaveData_i : in Array1(WIDTH-1 downto 0);
    slaveAck_i : in Array1(WIDTH-1 downto 0));
end entity;
 
 
-------------------------------------------------------------------------------
-- 
-------------------------------------------------------------------------------
architecture SwitchPortInterconnectImpl of SwitchPortInterconnect is
  --component ChipscopeIcon1 is
  --  port (
  --    CONTROL0 : inout STD_LOGIC_VECTOR ( 35 downto 0 )
  --    );
  --end component;
  --component ChipscopeIlaWb is
  --  port (
  --    CLK : in STD_LOGIC := 'X';
  --    TRIG0 : in STD_LOGIC_VECTOR ( 46 downto 0);
  --    CONTROL : inout STD_LOGIC_VECTOR ( 35 downto 0 ) 
  --    );
  --end component;
  --signal control : std_logic_vector(35 downto 0);
  --signal trig : std_logic_vector(46 downto 0);
 
  signal activeCycle : std_logic;
  signal selectedMaster : natural range 0 to WIDTH-1;
  signal selectedSlave : natural range 0 to WIDTH-1;
 
begin
 
  -----------------------------------------------------------------------------
  -- Arbitration process.
  -----------------------------------------------------------------------------
 
  RoundRobinArbiter: process(areset_n, clk)
    variable index : natural range 0 to WIDTH-1;
  begin
    if (areset_n = '0') then
      activeCycle <= '0';
      selectedMaster <= 0;
    elsif (clk'event and clk = '1') then
      -- Check if a cycle is ongoing.
      if (activeCycle = '0') then
        -- No ongoing cycles.
 
        -- Iterate through all ports and check if any new cycle has started.
        for i in 0 to WIDTH-1 loop
          if ((selectedMaster+i) >= WIDTH) then
            index := (selectedMaster+i) - WIDTH;
          else
            index := (selectedMaster+i);
          end if;
 
          if (masterCyc_i(index) = '1') then
            activeCycle <= '1';
            selectedMaster <= index;
          end if;
        end loop;
      else
        -- Ongoing cycle.
 
        -- Check if the cycle has ended.
        if (masterCyc_i(selectedMaster) = '0') then
          -- Cycle has ended.
          activeCycle <= '0';
 
          -- Check if a new cycle has started from another master.
          -- Start to check from the one that ended its cycle, this way, the
          -- ports will be scheduled like round-robin.
          for i in 0 to WIDTH-1 loop
            if ((selectedMaster+i) >= WIDTH) then
              index := (selectedMaster+i) - WIDTH;
            else
              index := (selectedMaster+i);
            end if;
 
            if (masterCyc_i(index) = '1') then
              activeCycle <= '1';
              selectedMaster <= index;
            end if;
          end loop;
        end if;
      end if;
    end if;
  end process;
 
  -----------------------------------------------------------------------------
  -- Address decoding.
  -----------------------------------------------------------------------------
 
  -- Select the last port when the top bit is set.
  -- The last port must be the maintenance slave port.
  selectedSlave <= WIDTH-1 when masterAddr_i(selectedMaster)(9) = '1' else
                   to_integer(unsigned(masterAddr_i(selectedMaster)(8 downto 1)));
 
  -----------------------------------------------------------------------------
  -- Interconnection matrix.
  -----------------------------------------------------------------------------
  Interconnect: for i in 0 to WIDTH-1 generate
    slaveCyc_o(i) <= masterCyc_i(selectedMaster) when (selectedSlave = i) else '0';
    slaveStb_o(i) <= masterStb_i(selectedMaster) when (selectedSlave = i) else '0';
    slaveWe_o(i) <= masterWe_i(selectedMaster);
    slaveAddr_o(i) <= masterAddr_i(selectedMaster);
    slaveData_o(i) <= masterData_i(selectedMaster);
    masterData_o(i) <= slaveData_i(selectedSlave);
    masterAck_o(i) <= slaveAck_i(selectedSlave) when (selectedMaster = i) else '0';
  end generate;
 
  -----------------------------------------------------------------------------
  -- Chipscope debugging probe.
  -----------------------------------------------------------------------------
  --trig <= masterCyc_i(selectedMaster) & masterStb_i(selectedMaster) &
  --        masterWe_i(selectedMaster) &  masterAddr_i(selectedMaster) &
  --        masterData_i(selectedMaster) & slaveData_i(selectedSlave) &
  --        slaveAck_i(selectedSlave);
  --ChipscopeIconInst: ChipscopeIcon1
  --  port map(CONTROL0=>control);
  --ChipscopeIlaInst: ChipscopeIlaWb
  --  port map(CLK=>clk, TRIG0=>trig, CONTROL=>control);
 
end architecture;
 
 
 
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[/] [rio/] [branches/] [2.0.0-development/] [rtl/] [vhdl/] [RioSwitch.vhd] - Blame information for rev 48

Line No.	Rev	Author	Line
1	2	magro732	`-------------------------------------------------------------------------------`
2			`--`
3			`-- RapidIO IP Library Core`
4			`--`
5			`-- This file is part of the RapidIO IP library project`
6			`-- http://www.opencores.org/cores/rio/`
7			`--`
8			`-- Description`
9			`-- Containing RapidIO packet switching functionality contained in the top`
10			`-- entity RioSwitch.`
11			`--`
12			`-- To Do:`
13	46	magro732	`-- - Add support for portWrite maintenance packets.`
14			`-- - Add a real crossbar as interconnect.`
15			`-- - Change the internal addressing to one-hot.`
16			`-- - Remove acknowledge cycle when transfering packets between ports to double`
17			`-- the bandwidth.`
18			`-- - Add hot-swap.`
19			`-- - Connect linkInitialized to all ports and read it from the source port`
20			`-- using the interconnect. This will allow alternative routes since the`
21			`-- sending port can see if a receiving port is up or not.`
22			`-- - Add support for extended route.`
23			`-- - Add validity-bit to know if a route has been activly set for a particular`
24	48	magro732	`-- deviceId. Currently, we rely on that the routing table memory is`
25			`-- initialized in the enumeration or at device startup.`
26	2	magro732	`--`
27			`-- Author(s):`
28			`-- - Magnus Rosenius, magro732@opencores.org`
29			`--`
30			`-------------------------------------------------------------------------------`
31			`--`
32			`-- Copyright (C) 2013 Authors and OPENCORES.ORG`
33			`--`
34			`-- This source file may be used and distributed without`
35			`-- restriction provided that this copyright statement is not`
36			`-- removed from the file and that any derivative work contains`
37			`-- the original copyright notice and the associated disclaimer.`
38			`--`
39			`-- This source file is free software; you can redistribute it`
40			`-- and/or modify it under the terms of the GNU Lesser General`