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axi_dmac: Fix constraints coverage and empty to list warnings 

Due to nets being optimized at IP-level during the no-OOC synthesis flow,
constraints related to req_clk (request clock) were not being applied,
causing the design to not meet timing.
The fix considers the synchronous modes, appending the possible resulting
req_clk's names after the synthesis flow.

Due to grounded signals in the DMA_TYPE_SRC != DMA_TYPE_STREAM_AXI config.,
sync_rewind is removed during synthesis, even so, constraints were
trying to be applied to those nets.
To resolve this, sync_rewind block was moved to inside the generate.
Vivado seems to properly suppress "Empty list" warnings when the circuit does not exist because of a generate rule.

Signed-off-by: Jorge Marques <jorge.marques@analog.com>
Signed-off-by: Ionut Podgoreanu <ionut.podgoreanu@analog.com>
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Jorge Marques 2023-07-10 09:28:59 -03:00 committed by GitHub
parent 8b15d66302
commit 15250232f9
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 42 additions and 23 deletions
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24
library/axi_dmac/axi_dmac_constr.ttcl
View File

@ -8,9 +8,27 @@
<: set async_src_dest [getBooleanValue "ASYNC_CLK_SRC_DEST"] :>
<: set disable_debug_registers [getBooleanValue "DISABLE_DEBUG_REGISTERS"] :>
set req_clk [get_clocks -of_objects [get_ports s_axi_aclk]]
set src_clk [get_clocks -of_objects [get_ports -quiet {fifo_wr_clk s_axis_aclk m_src_axi_aclk}]]
set dest_clk [get_clocks -of_objects [get_ports -quiet {fifo_rd_clk m_axis_aclk m_dest_axi_aclk}]]
set req_clk_ports_base {s_axi_aclk}
set src_clk_ports_base {fifo_wr_clk s_axis_aclk m_src_axi_aclk}
set dest_clk_ports_base {fifo_rd_clk m_axis_aclk m_dest_axi_aclk}
set req_clk_ports $req_clk_ports_base
set src_clk_ports $src_clk_ports_base
set dest_clk_ports $dest_clk_ports_base
<: if {[expr {!$async_req_src}]} { :>
set req_clk_ports "$req_clk_ports $src_clk_ports_base"
set src_clk_ports "$src_clk_ports $req_clk_ports_base"
<: } :>
<: if {[expr {!$async_src_dest}]} { :>
set src_clk_ports "$src_clk_ports $dest_clk_ports_base"
set dest_clk_ports "$dest_clk_ports $src_clk_ports_base"
<: } :>
<: if {[expr {!$async_dest_req}]} { :>
set req_clk_ports "$req_clk_ports $dest_clk_ports_base"
set dest_clk_ports "$dest_clk_ports $req_clk_ports_base"
<: } :>
set req_clk [get_clocks -of_objects [get_ports -quiet $req_clk_ports]]
set src_clk [get_clocks -of_objects [get_ports -quiet $src_clk_ports]]
set dest_clk [get_clocks -of_objects [get_ports -quiet $dest_clk_ports]]
<: if {$async_req_src || $async_src_dest || $async_dest_req} { :>
set_property ASYNC_REG TRUE \

41
library/axi_dmac/request_arb.v
View File

@ -1,6 +1,6 @@
// ***************************************************************************
// ***************************************************************************
// Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
// Copyright 2014 - 2023 (c) Analog Devices, Inc. All rights reserved.
//
// In this HDL repository, there are many different and unique modules, consisting
// of various HDL (Verilog or VHDL) components. The individual modules are
@ -309,7 +309,6 @@ module request_arb #(
wire [ID_WIDTH+3-1:0] rewind_req_data;
reg src_throttler_enabled = 1'b1;
wire src_throttler_enable;
wire rewind_state;
/* Unused for now
@ -772,6 +771,26 @@ module request_arb #(
.m_axis_level(),
.m_axis_empty());
wire src_throttler_enable;
sync_event #(
.ASYNC_CLK(ASYNC_CLK_REQ_SRC)
) sync_rewind (
.in_clk(req_clk),
.in_event(rewind_state),
.out_clk(src_clk),
.out_event(src_throttler_enable));
always @(posedge src_clk) begin
if (src_resetn == 1'b0) begin
src_throttler_enabled <= 'b1;
end else if (rewind_req_valid) begin
src_throttler_enabled <= 'b0;
end else if (src_throttler_enable) begin
src_throttler_enabled <= 'b1;
end
end
end else begin
assign s_axis_ready = 1'b0;
@ -878,24 +897,6 @@ module request_arb #(
end
endfunction
sync_event #(
.ASYNC_CLK(ASYNC_CLK_REQ_SRC)
) sync_rewind (
.in_clk(req_clk),
.in_event(rewind_state),
.out_clk(src_clk),
.out_event(src_throttler_enable));
always @(posedge src_clk) begin
if (src_resetn == 1'b0) begin
src_throttler_enabled <= 'b1;
end else if (rewind_req_valid) begin
src_throttler_enabled <= 'b0;
end else if (src_throttler_enable) begin
src_throttler_enabled <= 'b1;
end
end
/*
* Make sure that we do not request more data than what fits into the
* store-and-forward burst memory.