Add in C_ACCUM to debug accumulation sum

rtl/ip/matmul/matmul_axi_slave.v

@@ -446,6 +446,10 @@ module matmul_axi_slave (
                         b1_c[calc_idx] <= {2'b0, mult_p_r[0]} + {2'b0, mult_p_r[1]} + 
                                           {2'b0, mult_p_r[2]} + {2'b0, mult_p_r[3]};
                     end
+                    $display("ACCUM calc_idx=%d sum=%h p0=%h p1=%h p2=%h p3=%h",
+                             calc_idx,
+                             {2'b0, mult_p_r[0]} + {2'b0, mult_p_r[1]} + {2'b0, mult_p_r[2]} + {2'b0, mult_p_r[3]},
+                             mult_p_r[0], mult_p_r[1], mult_p_r[2], mult_p_r[3]);
                     
                     if (calc_idx == 4'd15) begin
                         calc_done_pulse <= 1'b1;