fixed DRAM response backpressure inside Cache

2020-11-10 05:24:57 -08:00
parent ed69be4027
commit 725322807e
19 changed files with 69 additions and 36 deletions
--- a/hw/rtl/VX_io_arb.v
+++ b/hw/rtl/VX_io_arb.v
@@ -64,7 +64,7 @@ module VX_io_arb #(
            .grant_onehot (req_1hot)
        );

-        wire stall = (| io_req_valid_out) && ~io_req_ready_out;
+        wire stall = ~io_req_ready_out && (| io_req_valid_out);

        VX_generic_register #(
            .N(`NUM_THREADS + TAG_OUT_WIDTH + (`NUM_THREADS * ADDR_WIDTH) + 1 + (`NUM_THREADS * WORD_SIZE) + (`NUM_THREADS * WORD_WIDTH)),
@@ -91,6 +91,7 @@ module VX_io_arb #(
            assign io_rsp_tag_in[i]   = io_rsp_tag_out[REQS_BITS +: TAG_IN_WIDTH];   
            assign io_rsp_data_in[i]  = io_rsp_data_out;           
        end
+        
        assign io_rsp_ready_out = io_rsp_ready_in[rsp_sel];
        
    end else begin