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优化sram的写路径，待验证

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FallenSigh
2026-07-02 00:36:59 +08:00
parent ed2876b3a8
commit 297b93b828
1 changed files with 35 additions and 45 deletions
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80
rtl/ip/Bus_interconnects/axi2sram_sp_external.v
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@@ -95,7 +95,6 @@ module axi2sram_sp_external #(
localparam WRITE = 3'h2; localparam WRITE = 3'h2;
localparam SEND_B = 3'h3; localparam SEND_B = 3'h3;
localparam WAIT_WVALID = 3'h4; localparam WAIT_WVALID = 3'h4;
localparam WRITE_NOP = 3'h5;
localparam READ_ADDR = 3'h6; localparam READ_ADDR = 3'h6;
localparam FIXED = 2'b00; localparam FIXED = 2'b00;
@@ -104,10 +103,6 @@ module axi2sram_sp_external #(
reg [AXI_ADDR_WIDTH-1:0] req_addr_d, req_addr_q; reg [AXI_ADDR_WIDTH-1:0] req_addr_d, req_addr_q;
reg [7:0] cnt_d, cnt_q; reg [7:0] cnt_d, cnt_q;
reg [AXI_DATA_WIDTH-1:0] rdata_q;
reg rlast_q;
reg read_capture;
reg read_capture_last;
function automatic [AXI_ADDR_WIDTH-1:0] get_wrap_boundary; function automatic [AXI_ADDR_WIDTH-1:0] get_wrap_boundary;
input [AXI_ADDR_WIDTH-1:0] unaligned_address; input [AXI_ADDR_WIDTH-1:0] unaligned_address;
@@ -150,8 +145,6 @@ module axi2sram_sp_external #(
ax_req_d_burst = ax_req_q_burst; ax_req_d_burst = ax_req_q_burst;
req_addr_d = req_addr_q; req_addr_d = req_addr_q;
cnt_d = cnt_q; cnt_d = cnt_q;
read_capture = 1'b0;
read_capture_last = 1'b0;
// Memory default assignments // Memory default assignments
data_o = s_wdata; data_o = s_wdata;
be_o = s_wstrb; be_o = s_wstrb;
@@ -190,7 +183,7 @@ module axi2sram_sp_external #(
ax_req_d_len = s_arlen; ax_req_d_len = s_arlen;
ax_req_d_size = s_arsize; ax_req_d_size = s_arsize;
ax_req_d_burst = s_arburst; ax_req_d_burst = s_arburst;
state_d = READ_ADDR; state_d = READ;
// we can request the first address, this saves us time // we can request the first address, this saves us time
req_o = 1'b1; req_o = 1'b1;
addr_o = s_araddr; addr_o = s_araddr;
@@ -215,7 +208,7 @@ module axi2sram_sp_external #(
if (s_wvalid) begin if (s_wvalid) begin
req_o = 1'b1; req_o = 1'b1;
we_o = 1'b1; we_o = 1'b1;
state_d = (s_wlast) ? SEND_B : WRITE_NOP; state_d = (s_wlast) ? SEND_B : WRITE;
cnt_d = 1; cnt_d = 1;
// we still have to wait for the first w_valid to arrive // we still have to wait for the first w_valid to arrive
end else end else
@@ -237,11 +230,14 @@ module axi2sram_sp_external #(
end end
READ: begin READ: begin
// keep request to memory high
req_o = 1'b1;
addr_o = req_addr_q;
// send the response // send the response
s_rvalid = 1'b1; s_rvalid = 1'b1;
s_rdata = rdata_q; s_rdata = data_i;
s_rid = ax_req_q_id; s_rid = ax_req_q_id;
s_rlast = rlast_q; s_rlast = (cnt_q == ax_req_q_len + 1);
// check that the master is ready, the slave must not wait on this // check that the master is ready, the slave must not wait on this
if (s_rready) begin if (s_rready) begin
// we sent the last byte -> go back to idle // we sent the last byte -> go back to idle
@@ -250,24 +246,7 @@ module axi2sram_sp_external #(
// we already got everything // we already got everything
end end
else begin else begin
req_o = 1'b1; state_d = READ_ADDR;
case (ax_req_q_burst)
FIXED, INCR: addr_o = cons_addr;
WRAP: begin
if (cons_addr == upper_wrap_boundary) begin
addr_o = wrap_boundary;
end else if (cons_addr > upper_wrap_boundary) begin
addr_o = ax_req_q_addr + ((cnt_q - ax_req_q_len) << LOG_NR_BYTES);
end else begin
addr_o = cons_addr;
end
end
endcase
cnt_d = cnt_q + 1;
req_addr_d = addr_o;
read_capture = 1'b1;
read_capture_last = (cnt_d == ax_req_q_len + 1);
state_d = READ;
end end
end end
end end
@@ -275,23 +254,40 @@ module axi2sram_sp_external #(
READ_ADDR: begin READ_ADDR: begin
// keep request to memory high // keep request to memory high
req_o = 1'b1; req_o = 1'b1;
addr_o = req_addr_q; // send the response
read_capture = 1'b1; s_rvalid = 1'b0;
read_capture_last = (cnt_q == ax_req_q_len + 1); // ----------------------------
state_d = READ; // Next address generation
// ----------------------------
// handle the correct burst type
case (ax_req_q_burst)
FIXED, INCR: addr_o = cons_addr;
WRAP: begin
// check if the address reached warp boundary
if (cons_addr == upper_wrap_boundary) begin
addr_o = wrap_boundary;
// address warped beyond boundary
end else if (cons_addr > upper_wrap_boundary) begin
addr_o = ax_req_q_addr + ((cnt_q - ax_req_q_len) << LOG_NR_BYTES);
// we are still in the incremental regime
end else begin
addr_o = cons_addr;
end end
end
//ext SRAM need nop between continuous write operations endcase
WRITE_NOP: begin // we need to change the address here for the upcoming request
s_wready = 1'b0; // we can decrease the counter as the master has consumed the read data
state_d = WRITE; cnt_d = cnt_q + 1;
// save the request address for the next cycle
req_addr_d = addr_o;
state_d = READ;
end end
// ~> we already wrote the first word here // ~> we already wrote the first word here
WRITE: begin WRITE: begin
s_wready = 1'b1; s_wready = 1'b1;
state_d = WRITE_NOP; state_d = WRITE;
// consume a word here // consume a word here
if (s_wvalid) begin if (s_wvalid) begin
@@ -350,8 +346,6 @@ module axi2sram_sp_external #(
ax_req_q_size <= 3'h0; ax_req_q_size <= 3'h0;
req_addr_q <= 'h0; req_addr_q <= 'h0;
cnt_q <= 8'h0; cnt_q <= 8'h0;
rdata_q <= 'h0;
rlast_q <= 1'b0;
end else begin end else begin
state_q <= state_d; state_q <= state_d;
ax_req_q_addr <= ax_req_d_addr; ax_req_q_addr <= ax_req_d_addr;
@@ -361,10 +355,6 @@ module axi2sram_sp_external #(
ax_req_q_size <= ax_req_d_size; ax_req_q_size <= ax_req_d_size;
req_addr_q <= req_addr_d; req_addr_q <= req_addr_d;
cnt_q <= cnt_d; cnt_q <= cnt_d;
if (read_capture) begin
rdata_q <= data_i;
rlast_q <= read_capture_last;
end
end end
end end