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axi_logic_analyzer: Improve overwrite control logic 

1. Add intermediary data_src_select register to control output selection
 between DMA and RAW. The switch RAW->DMA is not made until DMA has valid
 data; the switch DMA->RAW is not made until overwrite_enable is 1
 regardless of dac_valid.

2. When overwrite is enabled, set the intermediary DMA register data_r
 to the RAW value.

  This fixes an issue of the logic analizer that caused the last sample of a DMA
transfer to be visible at the next DMA transfer.

Signed-off-by: dumitruceclan <dumitru.ceclan@analog.com>
main
dumitruceclan 2024-01-29 12:24:16 +02:00 committed by AndreiGrozav
parent 8c08c5a65a
commit a23ed6f715
1 changed files with 14 additions and 2 deletions
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16
library/axi_logic_analyzer/axi_logic_analyzer.v
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@ -1,6 +1,6 @@
// ***************************************************************************
// ***************************************************************************
// Copyright (C) 2017-2023 Analog Devices, Inc. All rights reserved.
// Copyright (C) 2017-2024 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
@ -90,6 +90,7 @@ module axi_logic_analyzer (
// internal registers
reg [15:0] data_r = 'd0;
reg [15:0] data_src_select = 'd0;
reg [ 1:0] trigger_m1 = 'd0;
reg [31:0] downsampler_counter_la = 'd0;
reg [31:0] upsampler_counter_pg = 'd0;
@ -238,11 +239,22 @@ module axi_logic_analyzer (
for (i = 0 ; i < 16; i = i + 1) begin
assign data_t[i] = od_pp_n[i] ? io_selection[i] | data_o[i] : io_selection[i];
always @(posedge clk_out) begin
data_o[i] <= overwrite_enable[i] ? overwrite_data[i] : data_r[i];
data_o[i] <= data_src_select[i] ? overwrite_data[i] : data_r[i];
end
always @(posedge clk_out) begin
data_src_select[i] <= data_src_select[i] ?
(~dac_valid) | overwrite_enable[i]:
overwrite_enable[i];
end
always @(posedge clk_out) begin
if(dac_valid == 1'b1) begin
data_r[i] <= dac_data[i];
end else begin
if (data_src_select[i] == 1'b1) begin
data_r[i] <= overwrite_data[i];
end
end
if (io_selection_s[i] == 1'b1) begin
io_selection[i] <= 1'b1;