ci_nand.v

周立功:SOPC嵌入式系统实验教程（一）部分章节及实验代码

// Verilog Custom Instruction Template File for Combinatorial Logic

module ci_nand(
	dataa,		// Operand A (always required)
	datab,		// Operand B (optional)
	result		// result (always required)
);

//INPUTS
input	[31:0]	dataa;
input	[31:0]	datab;

//OUTPUTS
output	[31:0]	result;

// custom instruction logic (note:  no external interfaces are allowed in combinatorial logic)
assign result = ~(dataa&datab);

endmodule