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axi_dacfifo: Optimize the AXI write logic

main
Istvan Csomortani 2016-07-20 10:59:58 +03:00
parent c75289be21
commit b48401175a
1 changed files with 40 additions and 35 deletions
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73
library/axi_dacfifo/axi_dacfifo_wr.v
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@ -174,9 +174,8 @@ module axi_dacfifo_wr (
reg [31:0] dma_addr_cnt = 32'b0;
reg [31:0] dma_last_addr = 32'b0;
reg [ 2:0] axi_xfer_req_m = 3'b0;
reg [ 2:0] axi_xfer_last_m = 3'b0;
reg [ 4:0] axi_xfer_req_m = 3'b0;
reg [ 4:0] axi_xfer_last_m = 3'b0;
reg [(DMA_MEM_ADDRESS_WIDTH-1):0] axi_mem_waddr_m1 = 'b0;
reg [(DMA_MEM_ADDRESS_WIDTH-1):0] axi_mem_waddr_m2 = 'b0;
@ -190,6 +189,7 @@ module axi_dacfifo_wr (
reg [(AXI_MEM_ADDRESS_WIDTH-1):0] axi_mem_raddr_g = 'd0;
reg axi_mem_read_en = 1'b0;
reg axi_mem_read_en_d = 1'b0;
reg axi_mem_read_en_delay = 1'b0;
reg [(AXI_MEM_ADDRESS_WIDTH-1):0] axi_mem_addr_diff = 'b0;
reg axi_mem_last_read_toggle = 1'b0;
@ -202,8 +202,8 @@ module axi_dacfifo_wr (
reg axi_werror = 1'b0;
reg [ 3:0] axi_wvalid_counter = 4'b0;
reg axi_last_transaction = 1'b0;
reg axi_last_transaction_d = 1'b0;
reg axi_endof_transaction = 1'b0;
reg axi_endof_transaction_d = 1'b0;
// internal signals
@ -218,7 +218,6 @@ module axi_dacfifo_wr (
wire [(AXI_DATA_WIDTH-1):0] axi_mem_rdata_s;
wire axi_mem_rvalid_s;
wire axi_mem_last_s;
wire axi_mem_eot_s;
wire axi_waddr_ready_s;
wire axi_wready_s;
@ -379,15 +378,15 @@ module axi_dacfifo_wr (
always @(posedge axi_clk) begin
if (axi_resetn == 1'b0) begin
axi_xfer_req_m <= 3'b0;
axi_xfer_last_m <= 3'b0;
axi_xfer_req_m <= 4'b0;
axi_xfer_last_m <= 5'b0;
axi_xfer_init <= 1'b0;
axi_mem_waddr_m1 <= 'b0;
axi_mem_waddr_m2 <= 'b0;
axi_mem_waddr <= 'b0;
end else begin
axi_xfer_req_m <= {axi_xfer_req_m[1:0], dma_xfer_req};
axi_xfer_last_m <= {axi_xfer_last_m[1:0], dma_xfer_last};
axi_xfer_req_m <= {axi_xfer_req_m[3:0], dma_xfer_req};
axi_xfer_last_m <= {axi_xfer_last_m[3:0], dma_xfer_last};
axi_xfer_init = ~axi_xfer_req_m[2] & axi_xfer_req_m[1];
axi_mem_waddr_m1 <= dma_mem_waddr_g;
axi_mem_waddr_m2 <= axi_mem_waddr_m1;
@ -409,6 +408,22 @@ module axi_dacfifo_wr (
assign axi_mem_addr_diff_s = {1'b1, axi_mem_waddr_s} - axi_mem_raddr;
always @(posedge axi_clk) begin
if (axi_resetn == 1'b0) begin
axi_endof_transaction <= 1'b0;
axi_endof_transaction_d <= 1'b0;
axi_mem_addr_diff <= 'b0;
end else begin
axi_mem_addr_diff <= axi_mem_addr_diff_s[(AXI_MEM_ADDRESS_WIDTH-1):0];
axi_endof_transaction_d <= axi_endof_transaction;
if ((axi_xfer_req_m[4] == 1'b1) && (axi_xfer_last_m[4] == 1'b1) && (axi_xfer_last_m[3] == 1'b0)) begin
axi_endof_transaction <= 1'b1;
end else if((axi_endof_transaction == 1'b1) && (axi_wlast == 1'b1) && ((axi_mem_addr_diff == 0) || (axi_mem_addr_diff > AXI_LENGTH))) begin
axi_endof_transaction <= 1'b0;
end
end
end
// The asymmetric memory have to have enough data for at least one AXI burst,
// before the controller start an AXI write transaction.
@ -416,27 +431,29 @@ module axi_dacfifo_wr (
if (axi_resetn == 1'b0) begin
axi_mem_read_en <= 1'b0;
axi_mem_read_en_d <= 1'b0;
axi_mem_read_en_delay <= 1'b0;
axi_mem_addr_diff <= 'b0;
end else begin
axi_mem_addr_diff <= axi_mem_addr_diff_s[(AXI_MEM_ADDRESS_WIDTH-1):0];
if (axi_mem_read_en == 1'b0) begin
if (((axi_xfer_req_m[2] == 1'b1) && (axi_mem_addr_diff > AXI_LENGTH) && (axi_last_transaction_d == 1'b0)) ||
(axi_last_transaction == 1'b1) && (axi_last_transaction_d == 1'b0)) begin
if ((axi_mem_read_en == 1'b0) && (axi_mem_read_en_delay == 1'b0)) begin
if (((axi_xfer_req_m[2] == 1'b1) && (axi_mem_addr_diff > AXI_LENGTH)) ||
((axi_endof_transaction == 1'b1) && (axi_mem_addr_diff > AXI_LENGTH)) ||
((axi_endof_transaction == 1'b1) && (axi_mem_addr_diff > 0))) begin
axi_mem_read_en <= 1'b1;
end
end else if (axi_mem_last_s == 1'b1) begin
axi_mem_read_en <= 1'b0;
axi_mem_read_en_delay <= 1;
end
if (axi_wlast == 1'b1) begin
axi_mem_read_en_delay <= 0;
end
axi_mem_read_en_d <= axi_mem_read_en;
end
end
// If there is enough data and the AXI interface is ready, we can start to read
// out data from the memory
assign axi_mem_rvalid_s = axi_mem_read_en & axi_wready_s;
assign axi_mem_last_s = (axi_wvalid_counter == axi_awlen) ? axi_mem_rvalid_s : 1'b0;
assign axi_mem_eot_s = axi_wlast & axi_last_transaction;
always @(posedge axi_clk) begin
if (axi_resetn == 1'b0) begin
@ -457,9 +474,9 @@ module axi_dacfifo_wr (
axi_mem_rdata <= axi_mem_rdata_s;
if (axi_mem_rvalid_s == 1'b1) begin
axi_mem_raddr <= axi_mem_raddr + 1;
axi_wvalid_counter <= (axi_wvalid_counter == axi_awlen) ? 4'b0 : axi_wvalid_counter + 1;
axi_wvalid_counter <= ((axi_wvalid_counter == axi_awlen) || (axi_xfer_init == 1'b1)) ? 4'b0 : axi_wvalid_counter + 1;
end
if (axi_mem_eot_s == 1'b1) begin
if ((axi_endof_transaction == 1'b0) && (axi_endof_transaction_d == 1'b1)) begin
axi_mem_raddr <= 'b0;
axi_mem_last_read_toggle <= ~axi_mem_last_read_toggle;
end
@ -467,20 +484,6 @@ module axi_dacfifo_wr (
end
end
always @(posedge axi_clk) begin
if (axi_resetn == 1'b0) begin
axi_last_transaction <= 1'b0;
axi_last_transaction_d <= 1'b0;
end else begin
if ((axi_xfer_req_m[2] == 1'b1) && (axi_xfer_last_m[2] == 1'b1)) begin
axi_last_transaction <= 1'b1;
end else if (axi_wlast == 1'b1) begin
axi_last_transaction <= 1'b0;
end
axi_last_transaction_d <= axi_last_transaction;
end
end
// AXI Memory Map interface write address channel
assign axi_awid = 4'b0000;
@ -518,9 +521,11 @@ module axi_dacfifo_wr (
axi_awaddr <= axi_awaddr + AXI_AWINCR;
end
if (axi_xfer_last_m[2] == 1'b1) begin
axi_last_addr <= axi_awaddr;
axi_xfer_out <= 1'b1;
end
if ((axi_awvalid == 1'b1) && (axi_endof_transaction == 1'b1)) begin
axi_last_addr <= axi_awaddr;
end
end
end