题解 | #多功能数据处理器#
多功能数据处理器
https://www.nowcoder.com/practice/e009ab1a7a4c46fb9042c09c77ee27b8
`timescale 1ns/1ns
module data_select(
input clk,
input rst_n,
input signed[7:0]a,
input signed[7:0]b,
input [1:0]select,
output reg signed [8:0]c
);
always @ (posedge clk or negedge rst_n)
begin
if( ~rst_n ) begin
c <= 9'b0;
end
else begin
case ( select )
2'b00 : begin
c <= {a[7], a};
end
2'b01 : begin
c <= {b[7], b};
end
2'b10 : begin
c <= {a[7], a} + {b[7], b};
end
2'b11 : begin
c <= {a[7], a} - {b[7], b};
end
default : begin
c <= 9'b0;
end
endcase
end
end
endmodule
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