--------------------------------------------------------------------------------
--
-- Copyright (C) 2014
-- ASTRON (Netherlands Institute for Radio Astronomy) <http://www.astron.nl/>
-- JIVE (Joint Institute for VLBI in Europe) <http://www.jive.nl/>
-- P.O.Box 2, 7990 AA Dwingeloo, The Netherlands
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program 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 General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
--
-------------------------------------------------------------------------------
-- Purpose: Provide streaming interface to DDR memory
-- Description:
--
-- The write FIFO and read FIFO take care of the clock domain crossing that
-- is needed if the ctlr_clk is not used for the data path. Furthermore the
-- FIFO takes care of repacking the user write and read data into the
-- typically wider data width c_ctlr_data_w = 256 for DDR3.
--
-- The DDR access starts after a dvr_en pulse. The access can be write or
-- read as defined by dvr_wr_not_rd. The size of the access depends the
-- address range given by dvr_start_address and dvr_nof_data. The
-- dvr_done goes high when the access has finished and it goes low when a
-- new access starts.
--
-- The dvr_wr_flush_en pulse is recognized only between DDR accesses so when
-- the dvr_done is active, otherwise the dvr_wr_flush_en is ignored. The
-- dvr_wr_flush_en pulse can be used to flush the write FIFO to avoid that is
-- runs full in case a next write access will not happen soon enough. A next
-- DDR write access can start on the next valid, sop or sync dependent on
-- g_wr_flush_mode.
--
-- The c_rd_fifo_af_margin needs to be large enough to fit a number of read
-- bursts that may be pending in the DDR controller command queue depth.
-- A new rd access can start when ctlr_rd_src_in.ready indicates that there
-- is sufficient space in the read FIFO to store g_tech_ddr.maxburstsize
-- words. Due to the DDR controller command queue there can be more rd
-- bursts already be pending. Therefore the c_rd_fifo_af_margin needs to be
-- large enough to fit a number of read bursts.
-- Usage:
-- . The dvr interface could be connected to a MM register. The DDR memory
-- may then be used to capture (large) blocks of streaming data that can
-- offline be read via a DP-MM interface (eg. like in bn_capture). During
-- the read access the streaming write data then is flushed.
--
-- . The dvr interface could be connected to a DP sequencer that can write
-- blocks to DDR and read back from DDR. The DP sequencer uses signals
-- from its input DP interface. For write access the dvr_en could relate
-- to the sop and the dvr_nof_data then equals the nof data from sop to eop.
-- The dvr_done can be treated as xon. The dvr_wr_not_rd selects between
-- the write stream to DDR access or the read stream from DDR access. For a
-- read access the sequencer needs to generate the dvr signals itself.
--
-- . The dvr interface is mapped on the t_mem_ctlr_mosi/miso interface:
--
-- dvr_miso.done <= dvr_done -- Requested wr or rd sequence is done
-- dvr_en <= dvr_mosi.burstbegin
-- dvr_wr_not_rd <= dvr_mosi.wr -- No need to use dvr_mosi.rd
-- dvr_start_address <= dvr_mosi.address
-- dvr_nof_data <= dvr_mosi.burstsize
-- dvr_wr_flush_en <= dvr_mosi.flush
--
-- Block diagram:
--
-- ctlr_wr_fifo_src ctlr_wr_snk ctlr_tech_mosi
-- ________ . ______ . _______ . ______
-- wr_fifo_usedw <---|dp_fifo | . |dp | . | | . | |
-- wr_sosi --------->|dc_mixed|-+----->|flush |----->| io | . | tech |
-- wr_clk --------->|widths | | | | | ddr | . | ddr |
-- |________| | |______|<--\ | driver| . | |
-- | | | | . | |
-- | ctlr_wr_flush_en| | | . | |
-- ctlr_wr_fifo_src_out | ______ | | | . | |
-- \----->|io_ddr|---/ | | . | |
-- dvr_clk ------------> |driver| | | . | |<--- phy_in
-- dvr_wr_flush_en ----*-------------->|flush | | |---->| |---> phy_ou
-- /---->|ctrl |<--\ | |<----| |<--> phy_io
-- |/--->|______| | | | . | |
-- || | | | . | |
-- dvr_en --*---------+|---------------|->| | . | |
-- dvr_wr_not_rd --*----------+---------------|->| | . | |
-- dvr_done <-*--------------------------+--| | . | |
-- dvr_start_address --*---------------------------->| | . | |
-- dvr_nof_data --*---------------------------->| | . | |
-- ________ | | . | |
-- rd_clk --------->|dp_fifo | | | . | |
-- rd_sosi <---------|dc_mixed|<---------------------| | . | |
-- rd_fifo_usedw <---|widths | . |_______| . |______|---\
-- |________| . . |
-- ctlr_rd_src ctlr_tech_miso |
-- |
-- ctlr_clk /------ctlr_clk_in -------> |
-- \------ctlr_clk_out-----------------------------------------------/
--
-- * = clock domain crossing between dvr_clk and ctlr_clk clock domains.
----
-- Remarks:
-- . If the dvr_clk=ctlr_clk then the clock domain crossing logic defaults
-- to wires. However dvr_clk could also be the dp_clk or the mm_clk and then
-- the clock domain crossing logic is needed.
-- . Externally connect ctlr_clk = ctlr_clk_in = ctlr_clk_out
-- . Typically wr_clk = rd_clk = dp_clk.
-- . To achieve maximum DDR access rate the g_wr_data_w and g_rd_data_w
-- typically already need to be equal to the c_ctlr_data_w, because the
-- DP clk for wr_clk and rd_clk can typically not run much faster than the
-- ctlr_clk. Therefore in practise the mixed width FIFO will often be used
-- as equal width FIFO.
-- . The main PHY signals are carried by phy_ou and phy_io. The phy_in signals
-- are typically not needed.
-- . If ctlr_clk is used as dp_clk and connected to wr_clk, rd_clk and dvr_clk
-- then still the io_ddr_driver and a equal width rd FIFO are needed. The rd
-- FIFO is needed because the DDR controller does not have flow control
-- during the read burst. The wr FIFO is not needed provide that the user
-- write source does support flow control. If the user write source does not
-- support flow control then the wr FIFO is needed and io_ddr needs to be
-- used.
-- . The flushing does ensure that the write FIFO does not run full. If the
-- write input FIFO is a mixed width FIFO with narrow write data, then it
-- may not be possible to read the FIFO empty, because a wide data word
-- can only be read when it is complete. Typically this behaviour is fine
-- in applications, so no need to try to somehow flush an incomplete last
-- wide word from the FIFO.
-- . The flush control uses ctlr_wr_fifo_src_out and not the wr_sosi, because
-- dp_flush needs to be at the read side of the FIFO.
-- . The dvr_wr_flush_en is mapped to the dvr_mosi.flush in the
-- t_mem_ctlr_mosi. This is a bit awkward, because flush is not an Avalon
-- MM interface signal. However some external control needs to decide on
-- the need to flush or not, because that cannot be decided internally? An
-- option could be to automatically trigger a flush event when the write
-- FIFO runs almost full as indicated by wr_siso.ready. This scheme would
-- require that there is never a need to flush as long as the FIFO has not
-- run full.
library IEEE, technology_lib, tech_ddr_lib, common_lib, dp_lib;
use IEEE.std_logic_1164.all;
use common_lib.common_pkg.all;
use common_lib.common_mem_pkg.all;
use technology_lib.technology_select_pkg.all;
use technology_lib.technology_pkg.all;
use tech_ddr_lib.tech_ddr_pkg.all;
use dp_lib.dp_stream_pkg.all;
entity io_ddr is
generic(
g_sim_model : boolean := false; -- when FALSE use IP and external DDR3 model, else when TRUE: use fast behavioural model, requires no external memory (uses memory array).
g_technology : natural := c_tech_select_default;
g_tech_ddr : t_c_tech_ddr;
g_cross_domain_dvr_ctlr : boolean := true; -- use TRUE when MM clock is used for the access control, use FALSE when ctlr_clk_in=ctlr_clk_out is used to avoid extra latency
g_wr_data_w : natural := 32;
g_wr_fifo_depth : natural := 256; -- defined at DDR side of the FIFO, >=16 and independent of wr burst size, default >= 256 because 32b*256 fits in 1 M9K so c_ctlr_data_w=256b will require 8 M9K
g_rd_fifo_depth : natural := 256; -- defined at DDR side of the FIFO, >=16 AND > max number of rd burst sizes (so > c_rd_fifo_af_margin), default >= 256 because 32b*256 fits in 1 M9K so c_ctlr_data_w=256b will require 8 M9K
g_rd_data_w : natural := 32;
g_wr_flush_mode : string := "VAL"; -- "VAL", "SOP", "SYN"
g_wr_flush_use_channel : boolean := false;
g_wr_flush_start_channel : natural := 0;
g_wr_flush_nof_channels : positive := 1
);
port (
-- DDR reference clock
ctlr_ref_clk : in std_logic;
ctlr_ref_rst : in std_logic;
-- DDR controller clock domain
ctlr_clk_out : out std_logic;
ctlr_rst_out : out std_logic;
ctlr_clk_in : in std_logic; -- connect ctlr_clk_out to ctlr_clk_in at top level to avoid potential delta-cycle differences between the same clock
ctlr_rst_in : in std_logic; -- connect ctlr_rst_out to ctlr_rst_in at top level
-- MM clock + reset
mm_rst : in std_logic := '1';
mm_clk : in std_logic := '0';
-- MM interface
reg_io_ddr_mosi : in t_mem_mosi := c_mem_mosi_rst; -- register for DDR controller status info
reg_io_ddr_miso : out t_mem_miso;
state_vec : out std_logic_vector(1 downto 0);
-- Driver clock domain
dvr_clk : in std_logic;
dvr_rst : in std_logic;
dvr_miso : out t_mem_ctlr_miso;
dvr_mosi : in t_mem_ctlr_mosi;
-- Write FIFO clock domain
wr_clk : in std_logic;
wr_rst : in std_logic;
wr_fifo_usedw : out std_logic_vector(ceil_log2(g_wr_fifo_depth * (func_tech_ddr_ctlr_data_w(g_tech_ddr) / g_wr_data_w) ) - 1 downto 0); -- for monitoring purposes
wr_sosi : in t_dp_sosi;
wr_siso : out t_dp_siso;
ctlr_wr_flush_en_o : out std_logic;
-- Read FIFO clock domain
rd_clk : in std_logic;
rd_rst : in std_logic;
rd_fifo_usedw : out std_logic_vector(ceil_log2(g_rd_fifo_depth * (func_tech_ddr_ctlr_data_w(g_tech_ddr) / g_rd_data_w) ) - 1 downto 0);
rd_sosi : out t_dp_sosi;
rd_siso : in t_dp_siso;
term_ctrl_out : out t_tech_ddr3_phy_terminationcontrol;
term_ctrl_in : in t_tech_ddr3_phy_terminationcontrol := c_tech_ddr3_phy_terminationcontrol_rst;
-- DDR3 PHY external interface
phy3_in : in t_tech_ddr3_phy_in := c_tech_ddr3_phy_in_x;
phy3_io : inout t_tech_ddr3_phy_io;
phy3_ou : out t_tech_ddr3_phy_ou;
-- DDR4 PHY external interface
phy4_in : in t_tech_ddr4_phy_in := c_tech_ddr4_phy_in_x;
phy4_io : inout t_tech_ddr4_phy_io;
phy4_ou : out t_tech_ddr4_phy_ou;
-- DDR Calibration result
ddr_cal_ok : out std_logic := '0'
);
end io_ddr;
architecture str of io_ddr is
constant c_wr_use_sync : boolean := sel_a_b(g_wr_flush_mode = "SYN", true, false);
constant c_wr_use_ctrl : boolean := sel_a_b(g_wr_flush_mode = "SOP", true, false);
constant c_wr_fifo_use_ctrl : boolean := c_wr_use_sync or c_wr_use_ctrl;
constant c_ddr_nofbytes_w : natural := func_tech_ddr_module_nofbytes_w(g_tech_ddr); -- log2(number of bytes)
constant c_ddr_gigabytes : integer := func_tech_ddr_module_gigabytes(g_tech_ddr); -- units value GiByte when value > 1 or 2**value GiByte when value < 0
constant c_ctlr_nof_bytes_per_word : natural := func_tech_ddr_ctlr_ip_data_w(g_tech_ddr) / c_byte_w; -- unit byte
constant c_ctlr_address_w : natural := func_tech_ddr_ctlr_address_w(g_tech_ddr);
constant c_ctlr_data_w : natural := func_tech_ddr_ctlr_data_w(g_tech_ddr);
constant c_wr_fifo_depth : natural := g_wr_fifo_depth * (c_ctlr_data_w / g_wr_data_w); -- get FIFO depth at write side
constant c_wr_fifo_af_margin : natural := 8 + 1; -- use 8 (>= 4 default) to be safe and use +1 to compensate for latency introduced by registering wr_siso.ready due to RL=0
constant c_nof_rd_bursts_max : natural := sel_a_b(g_tech_ddr.name = "DDR3", 1, 3); -- max number of rd bursts in queue, derived empirically from simulation, seems fixed 1 for DDR3 and seems to match (g_tech_ddr.command_queue_depth-1)/2 for DDR4
constant c_rd_fifo_af_margin : natural := 8 + c_nof_rd_bursts_max * g_tech_ddr.maxburstsize; -- use 8 (>= 4 default) to be safe and use sufficient extra margin to fit one or more rd burst accesses of g_tech_ddr.maxburstsize each
constant c_mem_reg_adr_w : natural := 2;
constant c_mem_reg_dat_w : natural := 32;
constant c_mem_reg_nof_data : natural := 4;
constant c_mem_reg_io_ddr : t_c_mem := (c_mem_reg_rd_latency, c_mem_reg_adr_w , c_mem_reg_dat_w , c_mem_reg_nof_data, 'X');
signal ctlr_dvr_miso : t_mem_ctlr_miso;
signal ctlr_dvr_mosi : t_mem_ctlr_mosi;
signal ctlr_tech_mosi : t_mem_ctlr_mosi := c_mem_ctlr_mosi_rst;
signal ctlr_tech_miso : t_mem_ctlr_miso := c_mem_ctlr_miso_rst;
signal ctlr_wr_flush_en : std_logic := '0';
signal wr_fifo_snk_in : t_dp_sosi;
signal ctlr_wr_fifo_src_in : t_dp_siso;
signal ctlr_wr_fifo_src_out : t_dp_sosi := c_dp_sosi_rst;
signal ctlr_wr_flush_snk_in : t_dp_sosi := c_dp_sosi_rst;
signal ctlr_wr_snk_out : t_dp_siso := c_dp_siso_rdy; -- default xon='1'
signal ctlr_wr_snk_in : t_dp_sosi := c_dp_sosi_rst;
signal ctlr_rd_src_in : t_dp_siso;
signal ctlr_rd_src_out : t_dp_sosi := c_dp_sosi_rst;
-- Monitor only
signal ctlr_wr_fifo_usedw : std_logic_vector(ceil_log2(g_wr_fifo_depth) - 1 downto 0); -- read side depth of the write FIFO
signal ctlr_rd_fifo_usedw : std_logic_vector(ceil_log2(g_rd_fifo_depth) - 1 downto 0); -- write side depth of the read FIFO
signal reg_rd_arr : std_logic_vector(c_mem_reg_io_ddr.nof_dat - 1 downto 0);
signal wr_fifo_full : std_logic;
signal wr_fifo_full_reg : std_logic;
signal rd_fifo_full : std_logic;
signal rd_fifo_full_reg : std_logic;
signal dp_flush_snk_in : t_dp_sosi := c_dp_sosi_rst;
signal ctlr_rst_out_i : std_logic;
signal mm_reg_io_ddr : std_logic_vector(c_mem_reg_nof_data * c_mem_reg_dat_w - 1 downto 0);
begin
ctlr_wr_flush_en_o <= ctlr_wr_flush_en;
u_io_ddr_cross_domain : entity work.io_ddr_cross_domain
generic map (
g_cross_domain => g_cross_domain_dvr_ctlr,
g_delay_len => c_meta_delay_len
)
port map(
-- Driver clock domain
dvr_clk => dvr_clk,
dvr_rst => dvr_rst,
dvr_done => dvr_miso.done,
dvr_en => dvr_mosi.burstbegin,
dvr_wr_not_rd => dvr_mosi.wr,
dvr_start_address => dvr_mosi.address,
dvr_nof_data => dvr_mosi.burstsize,
dvr_wr_flush_en => dvr_mosi.flush,
-- DDR controller clock domain
ctlr_clk => ctlr_clk_in,
ctlr_rst => ctlr_rst_in,
ctlr_dvr_done => ctlr_dvr_miso.done,
ctlr_dvr_en => ctlr_dvr_mosi.burstbegin,
ctlr_dvr_wr_not_rd => ctlr_dvr_mosi.wr,
ctlr_dvr_start_address => ctlr_dvr_mosi.address,
ctlr_dvr_nof_data => ctlr_dvr_mosi.burstsize,
ctlr_dvr_wr_flush_en => ctlr_dvr_mosi.flush
);
p_wr_fifo_snk_in : process (wr_sosi)
begin
wr_fifo_snk_in <= wr_sosi;
if c_wr_use_sync = true then
-- Work around : Transport sync via sop through the dp_fifo_dc_mixed_widths
wr_fifo_snk_in.sop <= wr_sosi.sync;
wr_fifo_snk_in.eop <= '0';
end if;
end process;
u_wr_fifo : entity dp_lib.dp_fifo_dc_mixed_widths
generic map (
g_technology => g_technology,
g_wr_data_w => g_wr_data_w,
g_rd_data_w => c_ctlr_data_w,
g_use_ctrl => c_wr_fifo_use_ctrl,
g_wr_fifo_size => c_wr_fifo_depth,
g_wr_fifo_af_margin => c_wr_fifo_af_margin,
g_rd_fifo_rl => 0
)
port map (
wr_rst => wr_rst,
wr_clk => wr_clk,
rd_rst => ctlr_rst_in,
rd_clk => ctlr_clk_in,
snk_out => wr_siso,
snk_in => wr_fifo_snk_in,
wr_ful => wr_fifo_full,
wr_usedw => wr_fifo_usedw,
rd_usedw => ctlr_wr_fifo_usedw,
rd_emp => OPEN,
src_in => ctlr_wr_fifo_src_in,
src_out => ctlr_wr_fifo_src_out
);
u_dp_flush : entity dp_lib.dp_flush
generic map (
g_ready_latency => 0,
g_framed_xon => c_wr_fifo_use_ctrl, -- stop flushing when flush_en is low and a sop (or sync via sop) has arrived
g_framed_xoff => false -- immediately start flushing when flush_en goes high
)
port map (
rst => ctlr_rst_in,
clk => ctlr_clk_in,
snk_in => ctlr_wr_fifo_src_out,
snk_out => ctlr_wr_fifo_src_in,
src_out => ctlr_wr_snk_in,
src_in => ctlr_wr_snk_out,
flush_en => ctlr_wr_flush_en
);
p_ctlr_wr_flush_snk_in : process (ctlr_wr_fifo_src_out)
begin
ctlr_wr_flush_snk_in <= ctlr_wr_fifo_src_out;
if c_wr_use_sync = true then
-- Work around : Transport sync via sop through the dp_fifo_dc_mixed_widths
ctlr_wr_flush_snk_in.sync <= ctlr_wr_fifo_src_out.sop;
ctlr_wr_flush_snk_in.sop <= '0';
end if;
end process;
u_io_ddr_driver_flush_ctrl : entity work.io_ddr_driver_flush_ctrl
generic map (
g_mode => g_wr_flush_mode,
g_use_channel => g_wr_flush_use_channel,
g_start_channel => g_wr_flush_start_channel,
g_nof_channels => g_wr_flush_nof_channels
)
port map (
rst => ctlr_rst_in,
clk => ctlr_clk_in,
-- Inputs
dvr_en => ctlr_dvr_mosi.burstbegin,
dvr_wr_not_rd => ctlr_dvr_mosi.wr,
dvr_wr_flush_en => ctlr_dvr_mosi.flush,
dvr_done => ctlr_dvr_miso.done,
ctlr_wr_sosi => ctlr_wr_flush_snk_in,
-- Output
ctlr_wr_flush_en => ctlr_wr_flush_en,
state_vec => state_vec
);
assert g_rd_fifo_depth > c_rd_fifo_af_margin report "io_ddr: rd FIFO depth must be > almost full margin." severity FAILURE;
u_rd_fifo : entity dp_lib.dp_fifo_dc_mixed_widths
generic map (
g_technology => g_technology,
g_wr_data_w => c_ctlr_data_w,
g_rd_data_w => g_rd_data_w,
g_use_ctrl => false,
g_wr_fifo_size => g_rd_fifo_depth,
g_wr_fifo_af_margin => c_rd_fifo_af_margin, -- >=4 (required by dp_fifo)
g_rd_fifo_rl => 1
)
port map (
wr_rst => ctlr_rst_in,
wr_clk => ctlr_clk_in,
rd_rst => rd_rst,
rd_clk => rd_clk,
snk_out => ctlr_rd_src_in,
snk_in => ctlr_rd_src_out,
wr_ful => rd_fifo_full,
wr_usedw => ctlr_rd_fifo_usedw,
rd_usedw => rd_fifo_usedw,
rd_emp => OPEN,
src_in => rd_siso,
src_out => rd_sosi
);
u_io_ddr_driver : entity work.io_ddr_driver
generic map (
g_tech_ddr => g_tech_ddr
)
port map (
rst => ctlr_rst_in,
clk => ctlr_clk_in,
dvr_miso => ctlr_dvr_miso,
dvr_mosi => ctlr_dvr_mosi,
wr_snk_in => ctlr_wr_snk_in,
wr_snk_out => ctlr_wr_snk_out,
rd_src_out => ctlr_rd_src_out,
rd_src_in => ctlr_rd_src_in,
ctlr_miso => ctlr_tech_miso,
ctlr_mosi => ctlr_tech_mosi
);
u_tech_ddr : entity tech_ddr_lib.tech_ddr
generic map (
g_sim_model => g_sim_model,
g_technology => g_technology,
g_tech_ddr => g_tech_ddr
)
port map (
-- PLL reference clock
ref_clk => ctlr_ref_clk,
ref_rst => ctlr_ref_rst,
-- Controller user interface
ctlr_gen_clk => ctlr_clk_out,
ctlr_gen_rst => ctlr_rst_out_i,
ctlr_gen_clk_2x => OPEN,
ctlr_gen_rst_2x => OPEN,
ctlr_mosi => ctlr_tech_mosi,
ctlr_miso => ctlr_tech_miso,
term_ctrl_out => term_ctrl_out,
term_ctrl_in => term_ctrl_in,
-- DDR3 PHY interface
phy3_in => phy3_in,
phy3_io => phy3_io,
phy3_ou => phy3_ou,
-- DDR4 PHY interface
phy4_in => phy4_in,
phy4_io => phy4_io,
phy4_ou => phy4_ou
);
ctlr_rst_out <= ctlr_rst_out_i;
ddr_cal_ok <= ctlr_tech_miso.done;
u_wr_fifo_full : entity common_lib.common_switch
generic map(
g_priority_lo => true
)
port map(
rst => ctlr_rst_in,
clk => ctlr_clk_in,
switch_high => wr_fifo_full,
switch_low => reg_rd_arr(3),
out_level => wr_fifo_full_reg
);
u_rd_fifo_full : entity common_lib.common_switch
generic map(
g_priority_lo => true
)
port map(
rst => ctlr_rst_in,
clk => ctlr_clk_in,
switch_high => rd_fifo_full,
switch_low => reg_rd_arr(3),
out_level => rd_fifo_full_reg
);
mm_reg_io_ddr <= RESIZE_UVEC(rd_fifo_full_reg & wr_fifo_full_reg, c_mem_reg_dat_w) &
RESIZE_UVEC(ctlr_wr_fifo_usedw, c_mem_reg_dat_w) &
RESIZE_UVEC(ctlr_rd_fifo_usedw, c_mem_reg_dat_w) &
RESIZE_UVEC(TO_SVEC(c_ddr_gigabytes, 8) &
TO_UVEC(c_ctlr_nof_bytes_per_word, 8) &
ctlr_tech_mosi.wr & ctlr_tech_miso.rdval & ctlr_tech_miso.cal_fail & ctlr_tech_miso.cal_ok &
ctlr_rst_out_i & ctlr_wr_flush_en & ctlr_tech_miso.waitrequest_n & ctlr_tech_miso.done, c_mem_reg_dat_w);
u_reg_map : entity common_lib.common_reg_r_w_dc
generic map (
g_cross_clock_domain => true,
g_in_new_latency => 0,
g_readback => false,
g_reg => c_mem_reg_io_ddr,
g_init_reg => (others => '0')
)
port map (
-- Clocks and reset
mm_rst => mm_rst,
mm_clk => mm_clk,
st_rst => ctlr_rst_in,
st_clk => ctlr_clk_in,
-- Memory Mapped Slave in mm_clk domain
sla_in => reg_io_ddr_mosi,
sla_out => reg_io_ddr_miso,
-- MM registers in st_clk domain
reg_wr_arr => OPEN,
reg_rd_arr => reg_rd_arr,
in_new => '1',
in_reg => mm_reg_io_ddr,
out_reg => open
);
end str;