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axi_dmac: burst_memory: Reset beat counter at the end of each burst 

This simplifies the burst length in the response manager significantly
while not costing much extra resources in the burst memory.

This change will also enable other future improvements.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
main
Lars-Peter Clausen 2018-10-18 15:44:59 +02:00 committed by Laszlo Nagy
parent 764f31463e
commit 34e89b9e39
2 changed files with 3 additions and 21 deletions
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4
library/axi_dmac/axi_dmac_burst_memory.v
View File

@ -208,7 +208,7 @@ always @(posedge src_clk) begin
end
always @(posedge src_clk) begin
if (src_reset == 1'b1) begin
if (src_reset == 1'b1 || src_last_beat == 1'b1) begin
src_beat_counter <= 'h00;
end else if (src_beat == 1'b1) begin
src_beat_counter <= src_beat_counter + 1'b1;
@ -307,7 +307,7 @@ always @(posedge dest_clk) begin
end
always @(posedge dest_clk) begin
if (dest_reset == 1'b1) begin
if (dest_reset == 1'b1 || dest_last_beat == 1'b1) begin
dest_beat_counter <= 'h00;
end else if (dest_beat == 1'b1) begin
dest_beat_counter <= dest_beat_counter + 1'b1;

20
library/axi_dmac/axi_dmac_response_manager.v
View File

@ -104,9 +104,6 @@ wire [1:0] response_dest_resp;
wire response_dest_resp_eot;
wire [BYTES_PER_BURST_WIDTH-1:0] response_dest_data_burst_length;
wire [BURST_LEN_WIDTH-1:0] burst_lenght;
reg [BURST_LEN_WIDTH-1:0] burst_pointer_end;
reg [1:0] to_complete_count = 'h0;
reg [1:0] transfer_id = 'h0;
reg completion_req_last_found = 1'b0;
@ -170,27 +167,12 @@ begin
end
end
// transform the free running pointer from burst memory into burst length
assign burst_lenght = req_response_dest_data_burst_length[BYTES_PER_BURST_WIDTH-1 -: BURST_LEN_WIDTH] -
burst_pointer_end - 1'b1;
always @(posedge req_clk)
begin
if (req_resetn == 1'b0) begin
burst_pointer_end <= {BURST_LEN_WIDTH{1'b1}};
end else if (state == STATE_ACC) begin
burst_pointer_end <= req_response_dest_data_burst_length[BYTES_PER_BURST_WIDTH-1 -: BURST_LEN_WIDTH];
end
end
always @(posedge req_clk)
begin
if (state == STATE_ZERO_COMPL) begin
measured_burst_length <= {BYTES_PER_BURST_WIDTH{1'b1}};
end else if (state == STATE_ACC) begin
measured_burst_length[BYTES_PER_BURST_WIDTH-1 -: BURST_LEN_WIDTH] <= burst_lenght;
measured_burst_length[BYTES_PER_BEAT_WIDTH-1 : 0] <=
req_response_dest_data_burst_length[BYTES_PER_BEAT_WIDTH-1: 0];
measured_burst_length <= req_response_dest_data_burst_length;
end
end