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schelleg |
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-----------------------------------------------------------------------------
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-- NoCem -- Network on Chip Emulation Tool for System on Chip Research
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-- and Implementations
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--
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-- Copyright (C) 2006 Graham Schelle, Dirk Grunwald
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--
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-- This program is free software; you can redistribute it and/or
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-- modify it under the terms of the GNU General Public License
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-- as published by the Free Software Foundation; either version 2
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-- of the License, or (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program; if not, write to the Free Software
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-- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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-- 02110-1301, USA.
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--
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-- The authors can be contacted by email: <schelleg,grunwald>@cs.colorado.edu
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--
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-- or by mail: Campus Box 430, Department of Computer Science,
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-- University of Colorado at Boulder, Boulder, Colorado 80309
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--------------------------------------------------------------------------------
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--
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2 |
schelleg |
-- Filename: simple_pkt_local_arb.vhd
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4 |
schelleg |
--
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2 |
schelleg |
-- Description: nonVC design arbiter
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4 |
schelleg |
--
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library IEEE;
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use IEEE.STD_LOGIC_1164.ALL;
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use IEEE.STD_LOGIC_ARITH.ALL;
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use IEEE.STD_LOGIC_UNSIGNED.ALL;
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use work.pkg_nocem.all;
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entity simple_pkt_local_arb is
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Port (
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-- local arb info (should be held constant on incoming signal)
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local_arb_addr : std_logic_vector(NOCEM_AW-1 downto 0);
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-- needed to mux outputs for the accompanying switch
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arb_grant_output : out arb_decision_array(4 downto 0);
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n_pkt_cntrl_in : in pkt_cntrl_word;
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n_pkt_cntrl_out : out pkt_cntrl_word;
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n_channel_cntrl_in : in channel_cntrl_word;
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n_channel_cntrl_out : out channel_cntrl_word;
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s_pkt_cntrl_in : in pkt_cntrl_word;
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s_pkt_cntrl_out : out pkt_cntrl_word;
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s_channel_cntrl_in : in channel_cntrl_word;
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s_channel_cntrl_out : out channel_cntrl_word;
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e_pkt_cntrl_in : in pkt_cntrl_word;
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e_pkt_cntrl_out : out pkt_cntrl_word;
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e_channel_cntrl_in : in channel_cntrl_word;
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e_channel_cntrl_out : out channel_cntrl_word;
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w_pkt_cntrl_in : in pkt_cntrl_word;
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w_pkt_cntrl_out : out pkt_cntrl_word;
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w_channel_cntrl_in : in channel_cntrl_word;
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w_channel_cntrl_out : out channel_cntrl_word;
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ap_pkt_cntrl_in : in pkt_cntrl_word;
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ap_pkt_cntrl_out : out pkt_cntrl_word;
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ap_channel_cntrl_in : in channel_cntrl_word;
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ap_channel_cntrl_out : out channel_cntrl_word;
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clk : in std_logic;
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rst : in std_logic
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);
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end simple_pkt_local_arb;
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architecture Behavioral of simple_pkt_local_arb is
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signal local_addr_x : std_logic_vector(NOCEM_AW/2 -1 downto 0);
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signal local_addr_y : std_logic_vector(NOCEM_AW/2 -1 downto 0);
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-- since much of the work is repetitive, can use looping w/ indexing
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-- to save massive repetitive coding
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--many operations can be easily written if inputs are in array form
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signal dest_local_port : arb_decision_array(4 downto 0);
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signal dest_addr_array : node_addr_array(4 downto 0);
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signal datain_valid_array : std_logic_vector(4 downto 0);
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signal pkt_cntrl_valid_array : std_logic_vector(4 downto 0);
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signal pkt_cntrl_data_array : pkt_cntrl_array(4 downto 0);
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signal arb_decision_enum : arb_decision_array(4 downto 0);
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signal channel_cntrl_in_array_i : channel_cntrl_array(4 downto 0);
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signal channel_cntrl_out_array_i : channel_cntrl_array(4 downto 0);
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--signal srcToDstTimes2 : node_addr_array(4 downto 0);
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begin
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datain_valid_array(NOCEM_NORTH_IX) <= n_channel_cntrl_in(NOCEM_CHFIFO_DATA_EMPTY_N_IX);
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datain_valid_array(NOCEM_SOUTH_IX) <= s_channel_cntrl_in(NOCEM_CHFIFO_DATA_EMPTY_N_IX);
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datain_valid_array(NOCEM_EAST_IX) <= e_channel_cntrl_in(NOCEM_CHFIFO_DATA_EMPTY_N_IX);
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datain_valid_array(NOCEM_WEST_IX) <= w_channel_cntrl_in(NOCEM_CHFIFO_DATA_EMPTY_N_IX);
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datain_valid_array(NOCEM_AP_IX) <= ap_channel_cntrl_in(NOCEM_CHFIFO_DATA_EMPTY_N_IX);
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channel_cntrl_in_array_i(NOCEM_NORTH_IX) <= n_channel_cntrl_in;
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channel_cntrl_in_array_i(NOCEM_SOUTH_IX) <= s_channel_cntrl_in;
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channel_cntrl_in_array_i(NOCEM_EAST_IX) <= e_channel_cntrl_in;
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channel_cntrl_in_array_i(NOCEM_WEST_IX) <= w_channel_cntrl_in;
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channel_cntrl_in_array_i(NOCEM_AP_IX) <= ap_channel_cntrl_in;
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n_channel_cntrl_out <= channel_cntrl_out_array_i(NOCEM_NORTH_IX);
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s_channel_cntrl_out <= channel_cntrl_out_array_i(NOCEM_SOUTH_IX);
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e_channel_cntrl_out <= channel_cntrl_out_array_i(NOCEM_EAST_IX);
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w_channel_cntrl_out <= channel_cntrl_out_array_i(NOCEM_WEST_IX);
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ap_channel_cntrl_out <= channel_cntrl_out_array_i(NOCEM_AP_IX);
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pkt_cntrl_valid_array(NOCEM_NORTH_IX) <= n_channel_cntrl_in(NOCEM_CHFIFO_CNTRL_EMPTY_N_IX);
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pkt_cntrl_valid_array(NOCEM_SOUTH_IX) <= s_channel_cntrl_in(NOCEM_CHFIFO_CNTRL_EMPTY_N_IX);
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pkt_cntrl_valid_array(NOCEM_EAST_IX) <= e_channel_cntrl_in(NOCEM_CHFIFO_CNTRL_EMPTY_N_IX);
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pkt_cntrl_valid_array(NOCEM_WEST_IX) <= w_channel_cntrl_in(NOCEM_CHFIFO_CNTRL_EMPTY_N_IX);
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pkt_cntrl_valid_array(NOCEM_AP_IX) <= ap_channel_cntrl_in(NOCEM_CHFIFO_CNTRL_EMPTY_N_IX);
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pkt_cntrl_data_array(NOCEM_NORTH_IX) <= n_pkt_cntrl_in;
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pkt_cntrl_data_array(NOCEM_SOUTH_IX) <= s_pkt_cntrl_in;
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pkt_cntrl_data_array(NOCEM_EAST_IX) <= e_pkt_cntrl_in;
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pkt_cntrl_data_array(NOCEM_WEST_IX) <= w_pkt_cntrl_in;
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pkt_cntrl_data_array(NOCEM_AP_IX) <= ap_pkt_cntrl_in;
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arb_decision_enum(NOCEM_AP_IX) <= ARB_AP;
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arb_decision_enum(NOCEM_NORTH_IX) <= ARB_NORTH;
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arb_decision_enum(NOCEM_SOUTH_IX) <= ARB_SOUTH;
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arb_decision_enum(NOCEM_EAST_IX) <= ARB_EAST;
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arb_decision_enum(NOCEM_WEST_IX) <= ARB_WEST;
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--local address breakdown for readibility....
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local_addr_x <= local_arb_addr(NOCEM_AW-1 downto NOCEM_AW/2);
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local_addr_y <= local_arb_addr(NOCEM_AW/2 -1 downto 0);
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-- simply pass on the pkt_cntrl signals to the switch
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-- (may modify in other configs)
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n_pkt_cntrl_out <= n_pkt_cntrl_in;
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s_pkt_cntrl_out <= s_pkt_cntrl_in;
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e_pkt_cntrl_out <= e_pkt_cntrl_in;
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w_pkt_cntrl_out <= w_pkt_cntrl_in;
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ap_pkt_cntrl_out <= ap_pkt_cntrl_in;
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-- process to generate destination address from pkt_cntrl line
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dest_addr_gen_process : process (pkt_cntrl_valid_array, pkt_cntrl_data_array)
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begin
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l1: for I in 4 downto 0 loop
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if pkt_cntrl_valid_array(I) = '1' then
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dest_addr_array(I) <= pkt_cntrl_data_array(I)(NOCEM_PKTCNTRL_DEST_ADDR_HIX downto NOCEM_PKTCNTRL_DEST_ADDR_LIX);
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else
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dest_addr_array(I) <= (others => '0');
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end if;
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end loop;
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end process;
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-- process to determine routing based on incoming addr and data valid
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-- decision determined by topology and datain destination address
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port_dest_gen_process : process (datain_valid_array, local_addr_x, local_addr_y, dest_addr_array)
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begin
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-- DOUBLE TORUS: north/south have loop around, east/west have looparound....
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if NOCEM_TOPOLOGY_TYPE = NOCEM_TOPOLOGY_DTORUS then
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l20 : for I in 4 downto 0 loop
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dest_local_port(I) <= ARB_NODECISION;
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if datain_valid_array(I) = '1' then
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-- src > dst address. go east if ROWS >= 2(SRC-DST) . go west if ROWS < 2(SRC-DST)
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if dest_addr_array(I)(NOCEM_AW-1 downto NOCEM_AW/2) < local_addr_x then
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if NOCEM_NUM_ROWS >= TO_STDLOGICVECTOR(TO_BITVECTOR(local_addr_x - dest_addr_array(I)(NOCEM_AW-1 downto NOCEM_AW/2)) sll 1) then
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dest_local_port(I) <= ARB_EAST;
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else
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dest_local_port(I) <= ARB_WEST;
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end if;
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end if;
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-- dst > src address. go east if ROWS >= 2(DST-SRC) . go west if ROWS < 2(DST-SRC)
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if dest_addr_array(I)(NOCEM_AW-1 downto NOCEM_AW/2) > local_addr_x then
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if NOCEM_NUM_ROWS >= TO_STDLOGICVECTOR(TO_BITVECTOR(dest_addr_array(I)(NOCEM_AW-1 downto NOCEM_AW/2)- local_addr_x) sll 1) then
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dest_local_port(I) <= ARB_EAST;
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else
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dest_local_port(I) <= ARB_WEST;
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end if;
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end if;
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-- src > dst address. go north if ROWS >= 2(SRC-DST) . go south if ROWS < 2(SRC-DST)
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if dest_addr_array(I)(NOCEM_AW/2 -1 downto 0) < local_addr_y and
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dest_addr_array(I)(NOCEM_AW-1 downto NOCEM_AW/2) = local_addr_x then
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if NOCEM_NUM_ROWS >= TO_STDLOGICVECTOR(TO_BITVECTOR(local_addr_y - dest_addr_array(I)(NOCEM_AW/2 -1 downto 0)) sll 1) then
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dest_local_port(I) <= ARB_NORTH;
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else
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dest_local_port(I) <= ARB_SOUTH;
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end if;
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end if;
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if dest_addr_array(I)(NOCEM_AW/2 -1 downto 0) > local_addr_y and
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dest_addr_array(I)(NOCEM_AW-1 downto NOCEM_AW/2) = local_addr_x then
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-- dst > src address. go north if ROWS >= 2(DST-SRC) . go south if ROWS < 2(DST-SRC)
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if NOCEM_NUM_ROWS >= TO_STDLOGICVECTOR(TO_BITVECTOR(dest_addr_array(I)(NOCEM_AW/2 -1 downto 0) - local_addr_y) sll 1) then
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dest_local_port(I) <= ARB_NORTH;
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else
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dest_local_port(I) <= ARB_SOUTH;
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end if;
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end if;
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if dest_addr_array(I)(NOCEM_AW/2 -1 downto 0) = local_addr_y and
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dest_addr_array(I)(NOCEM_AW-1 downto NOCEM_AW/2) = local_addr_x then
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dest_local_port(I) <= ARB_AP;
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end if;
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else
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dest_local_port(I) <= ARB_NODECISION;
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end if;
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end loop;
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end if;
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-- TORUS: north/south have loop around, east/west do not....
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if NOCEM_TOPOLOGY_TYPE = NOCEM_TOPOLOGY_TORUS then
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l21 : for I in 4 downto 0 loop
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dest_local_port(I) <= ARB_NODECISION;
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if datain_valid_array(I) = '1' then
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if dest_addr_array(I)(NOCEM_AW-1 downto NOCEM_AW/2) < local_addr_x then
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dest_local_port(I) <= ARB_WEST;
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end if;
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if dest_addr_array(I)(NOCEM_AW-1 downto NOCEM_AW/2) > local_addr_x then
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dest_local_port(I) <= ARB_EAST;
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end if;
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-- src > dst address. go north if ROWS >= 2(SRC-DST) . go south if ROWS < 2(SRC-DST)
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if dest_addr_array(I)(NOCEM_AW/2 -1 downto 0) < local_addr_y and
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dest_addr_array(I)(NOCEM_AW-1 downto NOCEM_AW/2) = local_addr_x then
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if NOCEM_NUM_ROWS >= TO_STDLOGICVECTOR(TO_BITVECTOR(local_addr_y - dest_addr_array(I)(NOCEM_AW/2 -1 downto 0)) sll 1) then
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dest_local_port(I) <= ARB_NORTH;
|
| 289 |
|
|
else
|
| 290 |
|
|
dest_local_port(I) <= ARB_SOUTH;
|
| 291 |
|
|
end if;
|
| 292 |
|
|
end if;
|
| 293 |
|
|
|
| 294 |
|
|
if dest_addr_array(I)(NOCEM_AW/2 -1 downto 0) > local_addr_y and
|
| 295 |
|
|
dest_addr_array(I)(NOCEM_AW-1 downto NOCEM_AW/2) = local_addr_x then
|
| 296 |
|
|
|
| 297 |
|
|
-- dst > src address. go north if ROWS >= 2(DST-SRC) . go south if ROWS < 2(DST-SRC)
|
| 298 |
|
|
if NOCEM_NUM_ROWS >= TO_STDLOGICVECTOR(TO_BITVECTOR(dest_addr_array(I)(NOCEM_AW/2 -1 downto 0) - local_addr_y) sll 1) then
|
| 299 |
|
|
dest_local_port(I) <= ARB_NORTH;
|
| 300 |
|
|
else
|
| 301 |
|
|
dest_local_port(I) <= ARB_SOUTH;
|
| 302 |
|
|
end if;
|
| 303 |
|
|
end if;
|
| 304 |
|
|
|
| 305 |
|
|
if dest_addr_array(I)(NOCEM_AW/2 -1 downto 0) = local_addr_y and
|
| 306 |
|
|
dest_addr_array(I)(NOCEM_AW-1 downto NOCEM_AW/2) = local_addr_x then
|
| 307 |
|
|
|
| 308 |
|
|
dest_local_port(I) <= ARB_AP;
|
| 309 |
|
|
end if;
|
| 310 |
|
|
|
| 311 |
|
|
else
|
| 312 |
|
|
dest_local_port(I) <= ARB_NODECISION;
|
| 313 |
|
|
|
| 314 |
|
|
end if;
|
| 315 |
|
|
|
| 316 |
|
|
end loop;
|
| 317 |
|
|
|
| 318 |
|
|
end if;
|
| 319 |
|
|
|
| 320 |
|
|
|
| 321 |
|
|
|
| 322 |
|
|
-- MESH: simple deterministic routing....
|
| 323 |
|
|
if NOCEM_TOPOLOGY_TYPE = NOCEM_TOPOLOGY_MESH then
|
| 324 |
|
|
l22 : for I in 4 downto 0 loop
|
| 325 |
|
|
|
| 326 |
|
|
dest_local_port(I) <= ARB_NODECISION;
|
| 327 |
|
|
if datain_valid_array(I) = '1' then
|
| 328 |
|
|
|
| 329 |
|
|
if dest_addr_array(I)(NOCEM_AW-1 downto NOCEM_AW/2) < local_addr_x then
|
| 330 |
|
|
dest_local_port(I) <= ARB_WEST;
|
| 331 |
|
|
end if;
|
| 332 |
|
|
|
| 333 |
|
|
if dest_addr_array(I)(NOCEM_AW-1 downto NOCEM_AW/2) > local_addr_x then
|
| 334 |
|
|
dest_local_port(I) <= ARB_EAST;
|
| 335 |
|
|
end if;
|
| 336 |
|
|
|
| 337 |
|
|
if dest_addr_array(I)(NOCEM_AW/2 -1 downto 0) < local_addr_y and
|
| 338 |
|
|
dest_addr_array(I)(NOCEM_AW-1 downto NOCEM_AW/2) = local_addr_x then
|
| 339 |
|
|
|
| 340 |
|
|
dest_local_port(I) <= ARB_SOUTH;
|
| 341 |
|
|
end if;
|
| 342 |
|
|
|
| 343 |
|
|
if dest_addr_array(I)(NOCEM_AW/2 -1 downto 0) > local_addr_y and
|
| 344 |
|
|
dest_addr_array(I)(NOCEM_AW-1 downto NOCEM_AW/2) = local_addr_x then
|
| 345 |
|
|
|
| 346 |
|
|
dest_local_port(I) <= ARB_NORTH;
|
| 347 |
|
|
end if;
|
| 348 |
|
|
|
| 349 |
|
|
if dest_addr_array(I)(NOCEM_AW/2 -1 downto 0) = local_addr_y and
|
| 350 |
|
|
dest_addr_array(I)(NOCEM_AW-1 downto NOCEM_AW/2) = local_addr_x then
|
| 351 |
|
|
|
| 352 |
|
|
dest_local_port(I) <= ARB_AP;
|
| 353 |
|
|
end if;
|
| 354 |
|
|
|
| 355 |
|
|
else
|
| 356 |
|
|
dest_local_port(I) <= ARB_NODECISION;
|
| 357 |
|
|
|
| 358 |
|
|
end if;
|
| 359 |
|
|
|
| 360 |
|
|
|
| 361 |
|
|
end loop;
|
| 362 |
|
|
|
| 363 |
|
|
end if;
|
| 364 |
|
|
|
| 365 |
|
|
|
| 366 |
|
|
|
| 367 |
|
|
|
| 368 |
|
|
|
| 369 |
|
|
|
| 370 |
|
|
|
| 371 |
|
|
|
| 372 |
|
|
|
| 373 |
|
|
end process;
|
| 374 |
|
|
|
| 375 |
|
|
|
| 376 |
|
|
arb_gen_process : process (channel_cntrl_in_array_i, dest_local_port)
|
| 377 |
|
|
begin
|
| 378 |
|
|
|
| 379 |
|
|
|
| 380 |
|
|
|
| 381 |
|
|
arb_grant_output <= (others => ARB_NODECISION);
|
| 382 |
|
|
channel_cntrl_out_array_i <= (others => (others => '0'));
|
| 383 |
|
|
|
| 384 |
|
|
|
| 385 |
|
|
|
| 386 |
|
|
l3: for I in 4 downto 0 loop
|
| 387 |
|
|
|
| 388 |
|
|
-- I iterates over the OUTPUT ports
|
| 389 |
|
|
if channel_cntrl_in_array_i(I)(NOCEM_CHFIFO_DATA_FULL_N_IX) = '1' then
|
| 390 |
|
|
|
| 391 |
|
|
if dest_local_port(NOCEM_AP_IX) = arb_decision_enum(I) then
|
| 392 |
|
|
--arb grant will push data through switch
|
| 393 |
|
|
arb_grant_output(I) <= ARB_AP;
|
| 394 |
|
|
|
| 395 |
|
|
-- do read enable for selected incoming data
|
| 396 |
|
|
channel_cntrl_out_array_i(NOCEM_AP_IX)(NOCEM_CHFIFO_DATA_RE_IX) <= '1';
|
| 397 |
|
|
channel_cntrl_out_array_i(NOCEM_AP_IX)(NOCEM_CHFIFO_CNTRL_RE_IX) <= '1';
|
| 398 |
|
|
|
| 399 |
|
|
-- do write enable for outgoing port
|
| 400 |
|
|
channel_cntrl_out_array_i(I)(NOCEM_CHFIFO_DATA_WE_IX) <= '1';
|
| 401 |
|
|
channel_cntrl_out_array_i(I)(NOCEM_CHFIFO_CNTRL_WE_IX) <= '1';
|
| 402 |
|
|
|
| 403 |
|
|
elsif dest_local_port(NOCEM_NORTH_IX) = arb_decision_enum(I) then
|
| 404 |
|
|
arb_grant_output(I) <= ARB_NORTH;
|
| 405 |
|
|
channel_cntrl_out_array_i(NOCEM_NORTH_IX)(NOCEM_CHFIFO_DATA_RE_IX) <= '1';
|
| 406 |
|
|
channel_cntrl_out_array_i(NOCEM_NORTH_IX)(NOCEM_CHFIFO_CNTRL_RE_IX) <= '1';
|
| 407 |
|
|
channel_cntrl_out_array_i(I)(NOCEM_CHFIFO_DATA_WE_IX) <= '1';
|
| 408 |
|
|
channel_cntrl_out_array_i(I)(NOCEM_CHFIFO_CNTRL_WE_IX) <= '1';
|
| 409 |
|
|
|
| 410 |
|
|
|
| 411 |
|
|
elsif dest_local_port(NOCEM_SOUTH_IX) = arb_decision_enum(I) then
|
| 412 |
|
|
arb_grant_output(I) <= ARB_SOUTH;
|
| 413 |
|
|
channel_cntrl_out_array_i(NOCEM_SOUTH_IX)(NOCEM_CHFIFO_DATA_RE_IX) <= '1';
|
| 414 |
|
|
channel_cntrl_out_array_i(NOCEM_SOUTH_IX)(NOCEM_CHFIFO_CNTRL_RE_IX) <= '1';
|
| 415 |
|
|
channel_cntrl_out_array_i(I)(NOCEM_CHFIFO_DATA_WE_IX) <= '1';
|
| 416 |
|
|
channel_cntrl_out_array_i(I)(NOCEM_CHFIFO_CNTRL_WE_IX) <= '1';
|
| 417 |
|
|
|
| 418 |
|
|
elsif dest_local_port(NOCEM_EAST_IX) = arb_decision_enum(I) then
|
| 419 |
|
|
arb_grant_output(I) <= ARB_EAST;
|
| 420 |
|
|
channel_cntrl_out_array_i(NOCEM_EAST_IX)(NOCEM_CHFIFO_DATA_RE_IX) <= '1';
|
| 421 |
|
|
channel_cntrl_out_array_i(NOCEM_EAST_IX)(NOCEM_CHFIFO_CNTRL_RE_IX) <= '1';
|
| 422 |
|
|
channel_cntrl_out_array_i(I)(NOCEM_CHFIFO_DATA_WE_IX) <= '1';
|
| 423 |
|
|
channel_cntrl_out_array_i(I)(NOCEM_CHFIFO_CNTRL_WE_IX) <= '1';
|
| 424 |
|
|
|
| 425 |
|
|
elsif dest_local_port(NOCEM_WEST_IX) = arb_decision_enum(I) then
|
| 426 |
|
|
arb_grant_output(I) <= ARB_WEST;
|
| 427 |
|
|
channel_cntrl_out_array_i(NOCEM_WEST_IX)(NOCEM_CHFIFO_DATA_RE_IX) <= '1';
|
| 428 |
|
|
channel_cntrl_out_array_i(NOCEM_WEST_IX)(NOCEM_CHFIFO_CNTRL_RE_IX) <= '1';
|
| 429 |
|
|
channel_cntrl_out_array_i(I)(NOCEM_CHFIFO_DATA_WE_IX) <= '1';
|
| 430 |
|
|
channel_cntrl_out_array_i(I)(NOCEM_CHFIFO_CNTRL_WE_IX) <= '1';
|
| 431 |
|
|
|
| 432 |
|
|
end if;
|
| 433 |
|
|
end if;
|
| 434 |
|
|
|
| 435 |
|
|
|
| 436 |
|
|
|
| 437 |
|
|
|
| 438 |
|
|
end loop;
|
| 439 |
|
|
|
| 440 |
|
|
|
| 441 |
|
|
|
| 442 |
|
|
end process;
|
| 443 |
|
|
|
| 444 |
|
|
|
| 445 |
|
|
end Behavioral;
|
