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util_do_ram: Fix Rx path for interrupted transfers 

When capture length is not programmed the DMA will interrupt the
transfer once it received all the samples he was set in its descriptor,
this case must be handled by resetting the read process and returning
an end of transfer (eot) to the data offload control logic.
main
Laszlo Nagy 2022-06-22 13:22:57 +01:00 committed by Laszlo Nagy
parent 1d4b27ea8c
commit 7a48f1beb9
1 changed files with 12 additions and 5 deletions
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17
library/util_do_ram/util_do_ram.v
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@ -182,7 +182,9 @@ module util_do_ram #(
reg rd_active = 1'b0;
reg [1:0] rd_req_cnt = 2'b0;
always @(posedge m_axis_aclk) begin
if (rd_request_valid & rd_request_ready)
if (~rd_request_enable)
rd_req_cnt <= 2'b0;
else if (rd_request_valid & rd_request_ready)
rd_req_cnt <= rd_req_cnt + 2'b1;
else if (rd_response_eot)
rd_req_cnt <= rd_req_cnt - 2'b1;
@ -195,12 +197,17 @@ module util_do_ram #(
rd_length <= rd_request_length[LENGTH_WIDTH-1:DST_ADDR_ALIGN];
end
wire rd_early_finish;
assign rd_early_finish = rd_active & ~rd_request_enable;
assign rd_last_beat = (rd_addr == rd_length) & rd_enable;
assign rd_response_eot = m_axis_last & m_axis_valid & m_axis_ready;
assign rd_response_eot = (m_axis_last & m_axis_valid & m_axis_ready) || rd_early_finish;
// Read logic
always @(posedge m_axis_aclk) begin
if (rd_request_valid & rd_request_ready)
if (~rd_request_enable)
rd_active <= 1'b0;
else if (rd_request_valid & rd_request_ready)
rd_active <= 1'b1;
else if (rd_last_beat)
rd_active <= rd_req_cnt == 2;
@ -253,7 +260,7 @@ module util_do_ram #(
.M_AXIS_REGISTERED(0)
) i_rd_fifo (
.s_axis_aclk(m_axis_aclk),
.s_axis_aresetn(m_axis_aresetn),
.s_axis_aresetn(m_axis_aresetn & rd_request_enable),
.s_axis_valid(rd_fifo_s_valid),
.s_axis_ready(rd_fifo_s_ready),
.s_axis_full(),
@ -264,7 +271,7 @@ module util_do_ram #(
.s_axis_almost_full(),
.m_axis_aclk(m_axis_aclk),
.m_axis_aresetn(m_axis_aresetn),
.m_axis_aresetn(m_axis_aresetn & rd_request_enable),
.m_axis_valid(m_axis_valid),
.m_axis_ready(m_axis_ready),
.m_axis_data({m_axis_last,m_axis_data}),