Finish splitting out functions.

[fpgaboy.git] / insn_rst.v

`ifdef EXECUTE
	`INSN_RST: begin
		case (cycle)
		0:	begin
				`EXEC_INC_PC;		// This goes FIRST in RST
			end
		1:	begin
				wr <= 1;
				address <= {registers[`REG_SPH],registers[`REG_SPL]}-1;
				wdata <= registers[`REG_PCH];
			end
		2:	begin
				wr <= 1;
				address <= {registers[`REG_SPH],registers[`REG_SPL]}-2;
				wdata <= registers[`REG_PCL];
			end
		3:	begin
				`EXEC_NEWCYCLE;
				{registers[`REG_PCH],registers[`REG_PCL]} <=
					{10'b0,opcode[5:3],3'b0};
			end
		endcase
	end
`endif

`ifdef WRITEBACK
	`INSN_RST: begin
		case (cycle)
		0:	begin /* type F */ end
		1:	begin /* type F */ end
		2:	begin /* type F */ end
		3:	{registers[`REG_SPH],registers[`REG_SPL]} <=
				{registers[`REG_SPH],registers[`REG_SPL]}-2;
		endcase
	end
`endif