RR(Rotate Right)

Transform() 함수 내부에서 동작하는 여러 모듈 중 하나.

 

 

---

* RTL

// rotate right
module calc_RR(
	input 	wire 	[8*8-1:0] 	x,
	input 	wire 	[4:0]		n,
	output 	wire 	[8*8-1:0] 	calc_x
);

	assign calc_x = (x>>n) | (x<<(64-n)); // 64bit

endmodule

(x>>13) | (x<<(64-13))

= (x>>13) | (x<<51)

 

* TestBench

`timescale 1ns/1ps

module tb_define;
	reg 	[8*8-1:0]	i_msg;
	reg 	[4:0]		i_cnt;
	wire 	[8*8-1:0]	o_result;

	calc_RR U0_RR	(
		.x	(	i_msg		),
		.n	(	i_cnt		),
		.calc_x	(	o_result	)
	);

	// Generate inputs
	initial begin
		i_msg = 'b1100_1100;
		i_cnt = 'd13;

		#(50);
		$finish;
	end

endmodule

 

 

 

---

출력 결과

이건..(32-n)햇을 때

64bit Roate Right 출력 결과

13회 오른쪽으로 회전 이동을 한 결과이다.

입력값: 0000_0000_0000_0000__0000_0000_0000_0000__0000_0000_0000_0000_0000_0000_1100_1100

출력값: 0000_0110_0110_0000__0000_0000_0000_0000__0000_0000_0000_0000__0000_0000_0000_0000

 

 

x>>13 : 0000_0000_0000_0000__0000_0000_0000_0000__0000_0000_0000_0000__0000_0000_0000_0000

x<<51 : 0000_0110_0110_0000__0000_0000_0000_0000__0000_0000_0000_0000__0000_0000_0000_0000

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or연산 : 0000_0110_0110_0000__0000_0000_0000_0000__0000_0000_0000_0000__0000_0000_0000_0000

 

 

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