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critical path optimization - fpga fmax @4c = ~212 mhz

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This commit is contained in:
Blaise Tine
2020-12-26 03:28:32 -08:00
parent d5c6b9b4d9
commit b459192dec
11 changed files with 216 additions and 169 deletions
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13
hw/rtl/VX_issue.v
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@@ -28,7 +28,6 @@ module VX_issue #(
VX_gpr_rsp_if gpr_rsp_if();
wire scoreboard_delay;
wire [`NW_BITS-1:0] deq_wid_next;
VX_ibuffer #(
.CORE_ID(CORE_ID)
@@ -37,7 +36,6 @@ module VX_issue #(
.reset (reset),
.freeze (1'b0),
.ibuf_enq_if (decode_if),
.deq_wid_next (deq_wid_next),
.ibuf_deq_if (ibuf_deq_if)
);
@@ -48,8 +46,6 @@ module VX_issue #(
.reset (reset),
.ibuf_deq_if (ibuf_deq_if),
.writeback_if (writeback_if),
.deq_wid_next (deq_wid_next),
.exe_delay (~execute_if.ready),
.delay (scoreboard_delay)
);
@@ -93,7 +89,10 @@ module VX_issue #(
.mul_req_if (mul_req_if),
.fpu_req_if (fpu_req_if),
.gpu_req_if (gpu_req_if)
);
);
// issue the instruction
assign ibuf_deq_if.ready = !scoreboard_delay && execute_if.ready;
`SCOPE_ASSIGN (issue_fire, ibuf_deq_if.valid && ibuf_deq_if.ready);
`SCOPE_ASSIGN (issue_wid, ibuf_deq_if.wid);
@@ -123,8 +122,8 @@ module VX_issue #(
`SCOPE_ASSIGN (writeback_data, writeback_if.data);
`ifdef PERF_ENABLE
reg [63:0] perf_ibf_stalls ;
reg [63:0] perf_scb_stalls ;
reg [63:0] perf_ibf_stalls;
reg [63:0] perf_scb_stalls;
reg [63:0] perf_alu_stalls;
reg [63:0] perf_lsu_stalls;
reg [63:0] perf_csr_stalls;