a bit of issue

diff --git a/Issue.v b/Issue.v
new file mode 100644 (file)
index 0000000..a303e85
--- /dev/null
+++ b/Issue.v
@@ -0,0 +1,44 @@
+module Issue(
+       input clk,
+       input Nrst,
+       
+       input stall,    /* pipeline control */
+       input flush,
+       
+       input inbubble, /* stage inputs */
+       input [31:0] insn,
+       input [31:0] inpc,
+       
+       output reg outbubble,   /* stage outputs */
+       output reg [31:0] outpc
+       /* other */
+       );
+       
+       always @(posedge clk)
+       begin
+               outbubble <= inbubble;
+               outpc <= inpc;
+       end
+
+`ifdef COPY_PASTA_FODDER
+       /* from page 2 of ARM7TDMIvE2.pdf */
+       casex (insn)
+       32'b????000000??????????????1001????:   /* Multiply -- must come before ALU, because it pattern matches a specific case of ALU */
+       32'b????00001???????????????1001????:   /* Multiply long */
+       32'b????00??????????????????????????:   /* ALU */
+       32'b????00010?00????????00001001????:   /* Atomic swap */
+       32'b????000100101111111111110001????:   /* Branch */
+       32'b????000??0??????????00001??1????:   /* Halfword transfer - register offset */
+       32'b????000??1??????????00001??1????:   /* Halfword transfer - register offset */
+       32'b????011????????????????????1????:   /* Undefined. I hate ARM */
+       32'b????01??????????????????????????:   /* Single data transfer */
+       32'b????100?????????????????????????:   /* Block data transfer */
+       32'b????101?????????????????????????:   /* Branch */
+       32'b????110?????????????????????????:   /* Coprocessor data transfer */
+       32'b????1110???????????????????0????:   /* Coprocessor data op */
+       32'b????1110???????????????????1????:   /* Coprocessor register transfer */
+       32'b????1111????????????????????????:   /* SWI */
+       endcase
+`endif
+
+endmodule