Vector2
Problem Statement
A 32-bit vector can be viewed as containing 4 bytes (bits [31:24], [23:16], etc.). Build a circuit that will reverse the byte ordering of the 4-byte word.
AaaaaaaaBbbbbbbbCcccccccDddddddd => DdddddddCcccccccBbbbbbbbAaaaaaaa
This operation is often used when the endianness of a piece of data needs to be swapped, for example between little-endian x86 systems and the big-endian formats used in many Internet protocols.
Tip
Part-select can be used on both the left side and right side of an assignment.
Official Solution
module top_module (
input [31:0] in,
output [31:0] out
);
assign out[31:24] = in[ 7: 0];
assign out[23:16] = in[15: 8];
assign out[15: 8] = in[23:16];
assign out[ 7: 0] = in[31:24];
endmodule
My Solution
module top_module(
input [31:0] in,
output [31:0] out );//
// assign out[31:24] = ...;
assign out = {in[7:0],in[15:8],in[23:16],in[31:24]};
endmodule
Note
- 这道题使用拼接符
{}就很方便。