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hdet/fpga/src/vendor/xilinx/atlys_ddr2/ddr2/example_design/rtl/iodrp_mcb_controller.vhd

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--*****************************************************************************
-- (c) Copyright 2009 Xilinx, Inc. All rights reserved.
--
-- This file contains confidential and proprietary information
-- of Xilinx, Inc. and is protected under U.S. and
-- international copyright and other intellectual property
-- laws.
--
-- DISCLAIMER
-- This disclaimer is not a license and does not grant any
-- rights to the materials distributed herewith. Except as
-- otherwise provided in a valid license issued to you by
-- Xilinx, and to the maximum extent permitted by applicable
-- law: (1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND
-- WITH ALL FAULTS, AND XILINX HEREBY DISCLAIMS ALL WARRANTIES
-- AND CONDITIONS, EXPRESS, IMPLIED, OR STATUTORY, INCLUDING
-- BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, NON-
-- INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE; and
-- (2) Xilinx shall not be liable (whether in contract or tort,
-- including negligence, or under any other theory of
-- liability) for any loss or damage of any kind or nature
-- related to, arising under or in connection with these
-- materials, including for any direct, or any indirect,
-- special, incidental, or consequential loss or damage
-- (including loss of data, profits, goodwill, or any type of
-- loss or damage suffered as a result of any action brought
-- by a third party) even if such damage or loss was
-- reasonably foreseeable or Xilinx had been advised of the
-- possibility of the same.
--
-- CRITICAL APPLICATIONS
-- Xilinx products are not designed or intended to be fail-
-- safe, or for use in any application requiring fail-safe
-- performance, such as life-support or safety devices or
-- systems, Class III medical devices, nuclear facilities,
-- applications related to the deployment of airbags, or any
-- other applications that could lead to death, personal
-- injury, or severe property or environmental damage
-- (individually and collectively, "Critical
-- Applications"). Customer assumes the sole risk and
-- liability of any use of Xilinx products in Critical
-- Applications, subject only to applicable laws and
-- regulations governing limitations on product liability.
--
-- THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS
-- PART OF THIS FILE AT ALL TIMES.
--
--*****************************************************************************
-- ____ ____
-- / /\/ /
-- /___/ \ / Vendor: Xilinx
-- \ \ \/ Version: %version
-- \ \ Application: MIG
-- / / Filename: iodrp_mcb_controller.vhd
-- /___/ /\ Date Last Modified: $Date: 2011/06/02 07:17:25 $
-- \ \ / \ Date Created: Mon Feb 9 2009
-- \___\/\___\
--
--Device: Spartan6
--Design Name: DDR/DDR2/DDR3/LPDDR
--Purpose: Xilinx reference design for IODRP controller for v0.9 device
--
--Reference:
--
-- Revision: Date: Comment
-- 1.0: 03/19/09: Initial version for IODRP_MCB read operations.
-- 1.1: 04/03/09: SLH - Added left shift for certain IOI's
-- 1.2: 02/14/11: Change FSM encoding from one-hot to gray to match Verilog version.
-- End Revision
--*******************************************************************************
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity iodrp_mcb_controller is
--output to IODRP SDI pin
--input from IODRP SDO pin
-- Register where memcell_address is captured during the READY state
-- Register which stores the write data until it is ready to be shifted out
-- The shift register which shifts out SDO and shifts in SDI.
-- This register is loaded before the address or data phase, but continues to shift for a writeback of read data
-- The signal which causes shift_through_reg to load the new value from data_out_mux, or continue to shift data in from DRP_SDO
-- The signal which indicates where the shift_through_reg should load from. 0 -> data_reg 1 -> memcell_addr_reg
-- The counter for which bit is being shifted during address or data phase
-- This is set after the first address phase has executed
-- The mux which selects between data_reg and memcell_addr_reg for sending to shift_through_reg
--added so that DRP_SDI output is only active when DRP_CS is active
port (
memcell_address : in std_logic_vector(7 downto 0);
write_data : in std_logic_vector(7 downto 0);
read_data : out std_logic_vector(7 downto 0);
rd_not_write : in std_logic;
cmd_valid : in std_logic;
rdy_busy_n : out std_logic;
use_broadcast : in std_logic;
drp_ioi_addr : in std_logic_vector(4 downto 0);
sync_rst : in std_logic;
DRP_CLK : in std_logic;
DRP_CS : out std_logic;
DRP_SDI : out std_logic;
DRP_ADD : out std_logic;
DRP_BKST : out std_logic;
DRP_SDO : in std_logic;
MCB_UIREAD : out std_logic
);
end entity iodrp_mcb_controller;
architecture trans of iodrp_mcb_controller is
type StType is (
READY,
DECIDE ,
ADDR_PHASE ,
ADDR_TO_DATA_GAP ,
ADDR_TO_DATA_GAP2,
ADDR_TO_DATA_GAP3,
DATA_PHASE ,
ALMOST_READY ,
ALMOST_READY2 ,
ALMOST_READY3
);
constant IOI_DQ0 : std_logic_vector(4 downto 0) := "00001";
constant IOI_DQ1 : std_logic_vector(4 downto 0) := "00000";
constant IOI_DQ2 : std_logic_vector(4 downto 0) := "00011";
constant IOI_DQ3 : std_logic_vector(4 downto 0) := "00010";
constant IOI_DQ4 : std_logic_vector(4 downto 0) := "00101";
constant IOI_DQ5 : std_logic_vector(4 downto 0) := "00100";
constant IOI_DQ6 : std_logic_vector(4 downto 0) := "00111";
constant IOI_DQ7 : std_logic_vector(4 downto 0) := "00110";
constant IOI_DQ8 : std_logic_vector(4 downto 0) := "01001";
constant IOI_DQ9 : std_logic_vector(4 downto 0) := "01000";
constant IOI_DQ10 : std_logic_vector(4 downto 0) := "01011";
constant IOI_DQ11 : std_logic_vector(4 downto 0) := "01010";
constant IOI_DQ12 : std_logic_vector(4 downto 0) := "01101";
constant IOI_DQ13 : std_logic_vector(4 downto 0) := "01100";
constant IOI_DQ14 : std_logic_vector(4 downto 0) := "01111";
constant IOI_DQ15 : std_logic_vector(4 downto 0) := "01110";
constant IOI_UDQS_CLK : std_logic_vector(4 downto 0) := "11101";
constant IOI_UDQS_PIN : std_logic_vector(4 downto 0) := "11100";
constant IOI_LDQS_CLK : std_logic_vector(4 downto 0) := "11111";
constant IOI_LDQS_PIN : std_logic_vector(4 downto 0) := "11110";
signal memcell_addr_reg : std_logic_vector(7 downto 0);
signal data_reg : std_logic_vector(7 downto 0);
signal shift_through_reg : std_logic_vector(8 downto 0);
signal load_shift_n : std_logic;
signal addr_data_sel_n : std_logic;
signal bit_cnt : std_logic_vector(2 downto 0);
signal rd_not_write_reg : std_logic;
signal AddressPhase : std_logic;
signal DRP_CS_pre : std_logic;
signal extra_cs : std_logic;
signal state,nextstate : StType;
attribute fsm_encoding : string;
attribute fsm_encoding of state : signal is "gray";
attribute fsm_encoding of nextstate : signal is "gray";
signal data_out : std_logic_vector(8 downto 0);
signal data_out_mux : std_logic_vector(8 downto 0);
signal DRP_SDI_pre : std_logic;
--synthesis translate_off
signal state_ascii : std_logic_vector(32 * 8 - 1 downto 0);
-- case(state)
--synthesis translate_on
-- The changes below are to compensate for an issue with 1.0 silicon.
-- It may still be necessary to add a clock cycle to the ADD and CS signals
--`define DRP_v1_0_FIX // Uncomment out this line for synthesis
procedure shift_n_expand(
data_in : in std_logic_vector(7 downto 0);
data_out : out std_logic_vector(8 downto 0)) is
variable data_out_xilinx2 : std_logic_vector(8 downto 0);
begin
if ((data_in(0)) = '1') then
data_out_xilinx2(1 downto 0) := "11";
else
data_out_xilinx2(1 downto 0) := "00";
end if;
if (data_in(1 downto 0) = "10") then
data_out_xilinx2(2 downto 1) := "11";
else
data_out_xilinx2(2 downto 1) := (data_in(1) & data_out_xilinx2(1));
end if;
if (data_in(2 downto 1) = "10") then
data_out_xilinx2(3 downto 2) := "11";
else
data_out_xilinx2(3 downto 2) := (data_in(2) & data_out_xilinx2(2));
end if;
if (data_in(3 downto 2) = "10") then
data_out_xilinx2(4 downto 3) := "11";
else
data_out_xilinx2(4 downto 3) := (data_in(3) & data_out_xilinx2(3));
end if;
if (data_in(4 downto 3) = "10") then
data_out_xilinx2(5 downto 4) := "11";
else
data_out_xilinx2(5 downto 4) := (data_in(4) & data_out_xilinx2(4));
end if;
if (data_in(5 downto 4) = "10") then
data_out_xilinx2(6 downto 5) := "11";
else
data_out_xilinx2(6 downto 5) := (data_in(5) & data_out_xilinx2(5));
end if;
if (data_in(6 downto 5) = "10") then
data_out_xilinx2(7 downto 6) := "11";
else
data_out_xilinx2(7 downto 6) := (data_in(6) & data_out_xilinx2(6));
end if;
if (data_in(7 downto 6) = "10") then
data_out_xilinx2(8 downto 7) := "11";
else
data_out_xilinx2(8 downto 7) := (data_in(7) & data_out_xilinx2(7));
end if;
end shift_n_expand;
-- Declare intermediate signals for referenced outputs
signal DRP_CS_xilinx1 : std_logic;
signal DRP_ADD_xilinx0 : std_logic;
signal ALMOST_READY2_ST : std_logic;
signal ADDR_PHASE_ST : std_logic;
signal BIT_CNT7 : std_logic;
signal ADDR_PHASE_ST1 : std_logic;
signal DATA_PHASE_ST : std_logic;
begin
-- Drive referenced outputs
DRP_CS <= DRP_CS_xilinx1;
DRP_ADD <= DRP_ADD_xilinx0;
-- process (state)
-- begin
-- case state is
-- when READY =>
-- state_ascii <= "READY";
-- when DECIDE =>
-- state_ascii <= "DECIDE";
-- when ADDR_PHASE =>
-- state_ascii <= "ADDR_PHASE";
-- when ADDR_TO_DATA_GAP =>
-- state_ascii <= "ADDR_TO_DATA_GAP";
-- when ADDR_TO_DATA_GAP2 =>
-- state_ascii <= "ADDR_TO_DATA_GAP2";
-- when ADDR_TO_DATA_GAP3 =>
-- state_ascii <= "ADDR_TO_DATA_GAP3";
-- when DATA_PHASE =>
-- state_ascii <= "DATA_PHASE";
-- when ALMOST_READY =>
-- state_ascii <= "ALMOST_READY";
-- when ALMOST_READY2 =>
-- state_ascii <= "ALMOST_READY2";
-- when ALMOST_READY3 =>
-- state_ascii <= "ALMOST_READY3";
-- when others =>
-- null;
-- end case;
-- end process;
process (DRP_CLK)
begin
if (DRP_CLK'event and DRP_CLK = '1') then
if (state = READY) then
memcell_addr_reg <= memcell_address;
data_reg <= write_data;
rd_not_write_reg <= rd_not_write;
end if;
end if;
end process;
rdy_busy_n <= '1' when state = READY else '0';
process (drp_ioi_addr, data_out)
begin
case drp_ioi_addr is
when IOI_DQ0 =>
data_out_mux <= data_out;
when IOI_DQ1 =>
data_out_mux <= data_out;
when IOI_DQ2 =>
data_out_mux <= data_out;
when IOI_DQ3 =>
data_out_mux <= data_out;
when IOI_DQ4 =>
data_out_mux <= data_out;
when IOI_DQ5 =>
data_out_mux <= data_out;
when IOI_DQ6 =>
data_out_mux <= data_out;
when IOI_DQ7 =>
data_out_mux <= data_out;
when IOI_DQ8 =>
data_out_mux <= data_out;
when IOI_DQ9 =>
data_out_mux <= data_out;
when IOI_DQ10 =>
data_out_mux <= data_out;
when IOI_DQ11 =>
data_out_mux <= data_out;
when IOI_DQ12 =>
data_out_mux <= data_out;
when IOI_DQ13 =>
data_out_mux <= data_out;
when IOI_DQ14 =>
data_out_mux <= data_out;
when IOI_DQ15 =>
data_out_mux <= data_out;
when IOI_UDQS_CLK =>
data_out_mux <= data_out;
when IOI_UDQS_PIN =>
data_out_mux <= data_out;
when IOI_LDQS_CLK =>
data_out_mux <= data_out;
when IOI_LDQS_PIN =>
data_out_mux <= data_out;
when others =>
data_out_mux <= data_out;
end case;
end process;
data_out <= ('0' & memcell_addr_reg) when (addr_data_sel_n = '1') else
('0' & data_reg);
process (DRP_CLK)
begin
if (DRP_CLK'event and DRP_CLK = '1') then
if (sync_rst = '1') then
shift_through_reg <= "000000000";
else
if (load_shift_n = '1') then --Assume the shifter is either loading or shifting, bit 0 is shifted out first
shift_through_reg <= data_out_mux;
else
shift_through_reg <= ('0' & DRP_SDO & shift_through_reg(7 downto 1));
end if;
end if;
end if;
end process;
process (DRP_CLK)
begin
if (DRP_CLK'event and DRP_CLK = '1') then
if (((state = ADDR_PHASE) or (state = DATA_PHASE)) and (sync_rst = '0')) then
bit_cnt <= bit_cnt + "001";
else
bit_cnt <= "000";
end if;
end if;
end process;
process (DRP_CLK)
begin
if (DRP_CLK'event and DRP_CLK = '1') then
if (sync_rst = '1') then
read_data <= "00000000";
else
if (state = ALMOST_READY3) then
read_data <= shift_through_reg(7 downto 0);
end if;
end if;
end if;
end process;
ALMOST_READY2_ST <= '1' when state = ALMOST_READY2 else '0';
ADDR_PHASE_ST <= '1' when state = ADDR_PHASE else '0';
BIT_CNT7 <= '1' when bit_cnt = "111" else '0';
process (DRP_CLK)
begin
if (DRP_CLK'event and DRP_CLK = '1') then
if (sync_rst = '1') then
AddressPhase <= '0';
else
if (AddressPhase = '1') then
-- Keep it set until we finish the cycle
AddressPhase <= AddressPhase and (not ALMOST_READY2_ST);
else
-- set the address phase when ever we finish the address phase
AddressPhase <= (ADDR_PHASE_ST and BIT_CNT7);
end if;
end if;
end if;
end process;
ADDR_PHASE_ST1 <= '1' when nextstate = ADDR_PHASE else '0';
DATA_PHASE_ST <= '1' when nextstate = DATA_PHASE else '0';
process (DRP_CLK)
begin
if (DRP_CLK'event and DRP_CLK = '1') then
DRP_ADD_xilinx0 <= ADDR_PHASE_ST1;
-- DRP_CS <= (drp_ioi_addr != IOI_DQ0) ? (nextstate == ADDR_PHASE) | (nextstate == DATA_PHASE) : (bit_cnt != 3'b111) && (nextstate == ADDR_PHASE) | (nextstate == DATA_PHASE);
DRP_CS_xilinx1 <= ADDR_PHASE_ST1 or DATA_PHASE_ST;
MCB_UIREAD <= DATA_PHASE_ST and rd_not_write_reg;
if (state = READY) then
DRP_BKST <= use_broadcast;
end if;
end if;
end process;
DRP_SDI_pre <= shift_through_reg(0) when (DRP_CS_xilinx1 = '1') else --if DRP_CS is inactive, just drive 0 out - this is a possible place to pipeline for increased performance
'0';
DRP_SDI <= DRP_SDO when ((rd_not_write_reg and DRP_CS_xilinx1 and not(DRP_ADD_xilinx0)) = '1') else --If reading, then feed SDI back out SDO - this is a possible place to pipeline for increased performance
DRP_SDI_pre;
process (state, cmd_valid, bit_cnt, rd_not_write_reg, AddressPhase,BIT_CNT7)
begin
addr_data_sel_n <= '0';
load_shift_n <= '0';
case state is
when READY =>
load_shift_n <= '0';
if (cmd_valid = '1') then
nextstate <= DECIDE;
else
nextstate <= READY;
end if;
when DECIDE =>
load_shift_n <= '1';
addr_data_sel_n <= '1';
nextstate <= ADDR_PHASE;
-- After the second pass go to end of statemachine
-- execute a second address phase for the alternative access method.
when ADDR_PHASE =>
load_shift_n <= '0';
if (BIT_CNT7 = '1') then
if (('1' and rd_not_write_reg) = '1') then
if (AddressPhase = '1') then
nextstate <= ALMOST_READY;
else
nextstate <= DECIDE;
end if;
else
nextstate <= ADDR_TO_DATA_GAP;
end if;
else
nextstate <= ADDR_PHASE;
end if;
when ADDR_TO_DATA_GAP =>
load_shift_n <= '1';
nextstate <= ADDR_TO_DATA_GAP2;
when ADDR_TO_DATA_GAP2 =>
load_shift_n <= '1';
nextstate <= ADDR_TO_DATA_GAP3;
when ADDR_TO_DATA_GAP3 =>
load_shift_n <= '1';
nextstate <= DATA_PHASE;
when DATA_PHASE =>
load_shift_n <= '0';
if (BIT_CNT7 = '1') then
nextstate <= ALMOST_READY;
else
nextstate <= DATA_PHASE;
end if;
when ALMOST_READY =>
load_shift_n <= '0';
nextstate <= ALMOST_READY2;
when ALMOST_READY2 =>
load_shift_n <= '0';
nextstate <= ALMOST_READY3;
when ALMOST_READY3 =>
load_shift_n <= '0';
nextstate <= READY;
when others =>
load_shift_n <= '0';
nextstate <= READY;
end case;
end process;
process (DRP_CLK)
begin
if (DRP_CLK'event and DRP_CLK = '1') then
if (sync_rst = '1') then
state <= READY;
else
state <= nextstate;
end if;
end if;
end process;
end architecture trans;
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