a bit of issue

[firearm.git] / Issue.v

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