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axi_dmac: Reset the fifo_rd_data if the DMA is off 

Reset the fifo_rd_data if the DMA does not have an active transfer.
Becasue all the DAC device cores are transfering the data from the FIFO
interface to the data interface without any validation signal, DMA needs to put
the data bus into a known state, to prevent the device core to send the
last known data again and again.
main
Istvan Csomortani 2017-10-04 14:52:40 +01:00
parent d690a614c1
commit f3daf0dacb
1 changed files with 32 additions and 8 deletions
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40
library/axi_dmac/dest_fifo_inf.v
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@ -54,11 +54,11 @@ module dmac_dest_fifo_inf #(
input response_eot,
input en,
output [DATA_WIDTH-1:0] dout,
output valid,
output underflow,
output reg [DATA_WIDTH-1:0] dout,
output reg valid,
output reg underflow,
output xfer_req,
output reg xfer_req,
output fifo_ready,
input fifo_valid,
@ -80,6 +80,10 @@ wire data_enabled;
wire _fifo_ready;
assign fifo_ready = _fifo_ready | ~enabled;
wire [DATA_WIDTH-1:0] dout_s;
wire valid_s;
wire underflow_s;
wire xfer_req_s;
reg en_d1;
wire data_ready;
wire data_valid;
@ -93,9 +97,9 @@ begin
end
end
assign underflow = en_d1 & (~data_valid | ~enable);
assign underflow_s = en_d1 & (~data_valid | ~enable);
assign data_ready = en_d1 & (data_valid | ~enable);
assign valid = en_d1 & data_valid & enable;
assign valid_s = en_d1 & data_valid & enable;
dmac_data_mover # (
.ID_WIDTH(ID_WIDTH),
@ -109,7 +113,7 @@ dmac_data_mover # (
.enable(enable),
.enabled(data_enabled),
.sync_id(sync_id),
.xfer_req(xfer_req),
.xfer_req(xfer_req_s),
.request_id(request_id),
.response_id(data_id),
@ -124,10 +128,30 @@ dmac_data_mover # (
.s_axi_data(fifo_data),
.m_axi_ready(data_ready),
.m_axi_valid(data_valid),
.m_axi_data(dout),
.m_axi_data(dout_s),
.m_axi_last()
);
always @(posedge clk) begin
if (resetn == 1'b0) begin
valid <= 1'b0;
underflow <= 1'b0;
xfer_req <= 1'b0;
end else begin
valid <= valid_s;
underflow <= underflow_s;
xfer_req <= xfer_req_s;
end
end
always @(posedge clk) begin
if ((resetn == 1'b0) || (valid_s == 1'b0)) begin
dout <= {DATA_WIDTH{1'b0}};
end else begin
dout <= dout_s;
end
end
dmac_response_generator # (
.ID_WIDTH(ID_WIDTH)
) i_response_generator (