Subversion Repositories sdhc-sc-core

-- SDHC-SC-Core

-- Secure Digital High Capacity Self Configuring Core

-- 

-- (C) Copyright 2010, Rainer Kastl

-- All rights reserved.

-- 

-- Redistribution and use in source and binary forms, with or without

-- modification, are permitted provided that the following conditions are met:

--     * Redistributions of source code must retain the above copyright

--       notice, this list of conditions and the following disclaimer.

--     * Redistributions in binary form must reproduce the above copyright

--       notice, this list of conditions and the following disclaimer in the

--       documentation and/or other materials provided with the distribution.

--     * Neither the name of the <organization> nor the

--       names of its contributors may be used to endorse or promote products

--       derived from this software without specific prior written permission.

-- 

-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS  "AS IS" AND

-- ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

-- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

-- DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY

-- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

-- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

-- LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

-- ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

-- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

-- 

-- File        : SdController-e.vhdl

-- Owner       : Rainer Kastl

-- Description : Main FSM controlling Cmd and Data FSM, communicates with Wb

-- Links       : SD Spec 2.00

-- 

library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

use work.Global.all;

use work.Sd.all;

use work.SdWb.all;

entity SdController is

        generic (

                gClkFrequency   : natural := 25E6;

                gHighSpeedMode  : boolean := true;

                gStartupTimeout : time    := 1 ms;

                gReadTimeout    : time    := 100 ms;

                gWriteTimeout   : time    := 250 ms

        );

        port (

                iClk         : in std_ulogic; -- rising edge

                iRstSync     : in std_ulogic;

                oHighSpeed   : out std_ulogic;

                -- SdCmd

                iSdCmd : in aSdCmdToController;

                oSdCmd : out aSdCmdFromController;

                -- SdData

                iSdData : in aSdDataToController;

                oSdData : out aSdDataFromController;

                -- SdWbSlave

                iSdWbSlave : in aSdWbSlaveToSdController;

                oSdWbSlave : out aSdControllerToSdWbSlave;

                -- Status

                oLedBank     : out aLedBank

        );

        begin

                assert (gStartupTimeout < gReadTimeout)

                report "gStartupTimeout has to be smaller than the read timeout"

                severity error;

                assert ((gHighSpeedMode = true and gClkFrequency >= 50E6) or gHighSpeedMode = false)

                report "High speed Mode needs at least 50 MHz clock"

                severity error;

end entity SdController;