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snooping response handling

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This commit is contained in:
Blaise Tine
2020-05-11 22:55:44 -04:00
parent b6c4aa0baa
commit c49f01b769
36 changed files with 848 additions and 456 deletions
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65
hw/rtl/VX_dram_arb.v
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@@ -15,7 +15,7 @@ module VX_dram_arb #(
input wire [NUM_REQUESTS-1:0][`DRAM_ADDR_WIDTH-1:0] core_req_addr,
input wire [NUM_REQUESTS-1:0][`BANK_LINE_WIDTH-1:0] core_req_data,
input wire [NUM_REQUESTS-1:0][CORE_TAG_WIDTH-1:0] core_req_tag,
output reg [NUM_REQUESTS-1:0] core_req_ready,
output wire [NUM_REQUESTS-1:0] core_req_ready,
// Core response
output wire [NUM_REQUESTS-1:0] core_rsp_valid,
@@ -24,11 +24,11 @@ module VX_dram_arb #(
input wire [NUM_REQUESTS-1:0] core_rsp_ready,
// DRAM request
output reg dram_req_read,
output reg dram_req_write,
output reg [`DRAM_ADDR_WIDTH-1:0] dram_req_addr,
output reg [`BANK_LINE_WIDTH-1:0] dram_req_data,
output reg [DRAM_TAG_WIDTH-1:0] dram_req_tag,
output wire dram_req_read,
output wire dram_req_write,
output wire [`DRAM_ADDR_WIDTH-1:0] dram_req_addr,
output wire [`BANK_LINE_WIDTH-1:0] dram_req_data,
output wire [DRAM_TAG_WIDTH-1:0] dram_req_tag,
input wire dram_req_ready,
// DRAM response
@@ -37,47 +37,34 @@ module VX_dram_arb #(
input wire [DRAM_TAG_WIDTH-1:0] dram_rsp_tag,
output wire dram_rsp_ready
);
reg [`REQS_BITS-1:0] bus_req_idx;
reg [`REQS_BITS-1:0] bus_req_sel;
always @(posedge clk) begin
if (reset) begin
bus_req_idx <= 0;
bus_req_sel <= 0;
end else begin
bus_req_idx <= bus_req_idx + 1;
bus_req_sel <= bus_req_sel + 1;
end
end
integer i;
generate
always @(*) begin
dram_req_read = 0;
dram_req_write = 0;
dram_req_addr = 'z;
dram_req_data = 'z;
dram_req_tag = 'z;
assign dram_req_read = core_req_read [bus_req_sel];
assign dram_req_write = core_req_write [bus_req_sel];
assign dram_req_addr = core_req_addr [bus_req_sel];
assign dram_req_data = core_req_data [bus_req_sel];
assign dram_req_tag = {core_req_tag [bus_req_sel], (`REQS_BITS)'(bus_req_sel)};
for (i = 0; i < NUM_REQUESTS; i++) begin
if (bus_req_idx == (`REQS_BITS)'(i)) begin
dram_req_read = core_req_read[i];
dram_req_write = core_req_write[i];
dram_req_addr = core_req_addr[i];
dram_req_data = core_req_data[i];
dram_req_tag = {core_req_tag[i], (`REQS_BITS)'(i)};
core_req_ready[i] = dram_req_ready;
end else begin
core_req_ready[i] = 0;
end
end
end
endgenerate
genvar j;
wire [`REQS_BITS-1:0] bus_rsp_idx = dram_rsp_tag[`REQS_BITS-1:0];
for (j = 0; j < NUM_REQUESTS; j++) begin
assign core_rsp_valid[j] = dram_rsp_valid && (bus_rsp_idx == (`REQS_BITS)'(j));
assign core_rsp_data[j] = dram_rsp_data;
assign core_rsp_tag[j] = dram_rsp_tag[`REQS_BITS +: CORE_TAG_WIDTH];
for (i = 0; i < NUM_REQUESTS; i++) begin
assign core_req_ready[i] = dram_req_ready && (bus_req_sel == `REQS_BITS'(i));
end
assign dram_rsp_ready = core_rsp_ready[bus_rsp_idx];
wire [`REQS_BITS-1:0] bus_rsp_sel = dram_rsp_tag[`REQS_BITS-1:0];
genvar i;
for (i = 0; i < NUM_REQUESTS; i++) begin
assign core_rsp_valid[i] = dram_rsp_valid && (bus_rsp_sel == `REQS_BITS'(i));
assign core_rsp_data[i] = dram_rsp_data;
assign core_rsp_tag[i] = dram_rsp_tag[`REQS_BITS +: CORE_TAG_WIDTH];
end
assign dram_rsp_ready = core_rsp_ready[bus_rsp_sel];
endmodule