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adding input buffering to bus arbiters to reduce backpressure delay propagation

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This commit is contained in:
Blaise Tine
2020-12-05 17:31:29 -08:00
parent 13a5370254
commit d0f2a3984d
17 changed files with 480 additions and 338 deletions
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42
hw/rtl/cache/VX_snp_forwarder.v vendored
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@@ -27,16 +27,16 @@ module VX_snp_forwarder #(
input wire snp_rsp_ready,
// Snoop Forwarding out
output wire [NUM_REQS-1:0] snp_fwdout_valid,
output wire [NUM_REQS-1:0] snp_fwdout_valid,
output wire [NUM_REQS-1:0][DST_ADDR_WIDTH-1:0] snp_fwdout_addr,
output wire [NUM_REQS-1:0] snp_fwdout_inv,
output wire [NUM_REQS-1:0][LOG_SNRQ_SIZE-1:0] snp_fwdout_tag,
input wire [NUM_REQS-1:0] snp_fwdout_ready,
output wire [NUM_REQS-1:0] snp_fwdout_inv,
output wire [NUM_REQS-1:0][LOG_SNRQ_SIZE-1:0] snp_fwdout_tag,
input wire [NUM_REQS-1:0] snp_fwdout_ready,
// Snoop forwarding in
input wire [NUM_REQS-1:0] snp_fwdin_valid,
input wire [NUM_REQS-1:0] snp_fwdin_valid,
input wire [NUM_REQS-1:0][LOG_SNRQ_SIZE-1:0] snp_fwdin_tag,
output wire [NUM_REQS-1:0] snp_fwdin_ready
output wire [NUM_REQS-1:0] snp_fwdin_ready
);
localparam ADDR_DIFF = DST_ADDR_WIDTH - SRC_ADDR_WIDTH;
localparam NUM_REQUESTS_QUAL = NUM_REQS * (1 << ADDR_DIFF);
@@ -44,6 +44,26 @@ module VX_snp_forwarder #(
`STATIC_ASSERT(NUM_REQS > 1, ("invalid value"))
// Inputs buffering
wire [NUM_REQS-1:0] snp_fwdin_valid_qual;
wire [NUM_REQS-1:0][LOG_SNRQ_SIZE-1:0] snp_fwdin_tag_qual;
wire [NUM_REQS-1:0] snp_fwdin_ready_qual;
for (genvar i = 0; i < NUM_REQS; ++i) begin
VX_skid_buffer #(
.DATAW (LOG_SNRQ_SIZE),
.PASSTHRU (NUM_REQS < 4)
) snp_fwdin_buffer (
.clk (clk),
.reset (reset),
.valid_in (snp_fwdin_valid[i]),
.data_in (snp_fwdin_tag[i]),
.ready_in (snp_fwdin_ready[i]),
.valid_out (snp_fwdin_valid_qual[i]),
.data_out (snp_fwdin_tag_qual[i]),
.ready_out (snp_fwdin_ready_qual[i])
);
end
reg [REQ_QUAL_BITS:0] pending_cntrs [SNRQ_SIZE-1:0];
wire [LOG_SNRQ_SIZE-1:0] sfq_write_addr, sfq_read_addr;
@@ -167,11 +187,11 @@ module VX_snp_forwarder #(
) snp_fwdin_arb (
.clk (clk),
.reset (reset),
.valid_in (snp_fwdin_valid),
.valid_out (fwdin_valid),
.data_in (snp_fwdin_tag),
.data_out (fwdin_tag),
.ready_in (snp_fwdin_ready),
.valid_in (snp_fwdin_valid_qual),
.data_in (snp_fwdin_tag_qual),
.ready_in (snp_fwdin_ready_qual),
.valid_out (fwdin_valid),
.data_out (fwdin_tag),
.ready_out (fwdin_ready)
);