移位寄存器设计实验 74LS198

实验原理

image-20211210205325528

实验步骤

image-20211210205357683

image-20211210205436290

实验代码

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`timescale 1ns / 1ps
module reg_74LS198(CR_, CP, S1, S2, SR, SL, D, Q);
    input CR_, CP, S1, S2, SR, SL;
    input [7:0]D;

    output reg[7:0]Q;

    always @(posedge CP or negedge CR_) begin
        if(!CR_) Q <= 8'b0000_0000;
        else begin
            case({S1, S2})
            2'b00: Q <= Q;
            2'b01: Q <= {SR, Q[7:1]};
            2'b10: Q <= {Q[6:0], SL};
            2'b11: Q <= D;
            endcase           
        end
    end
endmodule

板极验证

使用的板卡型号：xc7a100tlcsg324-2L

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set_property CLOCK_DEDICATED_ROUTE FALSE [get_nets CR_]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN V5} [get_ports CR_]

set_property CLOCK_DEDICATED_ROUTE FALSE [get_nets CP]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN U17} [get_ports CP]

set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN T4} [get_ports S1]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN V6} [get_ports S2]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN T5} [get_ports SR]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN T6} [get_ports SL]

set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN R11} [get_ports {D[7]}]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN U12} [get_ports {D[6]}]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN T13} [get_ports {D[5]}]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN V14} [get_ports {D[4]}]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN T14} [get_ports {D[3]}]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN V15} [get_ports {D[2]}]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN R15} [get_ports {D[1]}]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN U16} [get_ports {D[0]}]

set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN U6} [get_ports {Q[7]}]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN R5} [get_ports {Q[6]}]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN U7} [get_ports {Q[5]}]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN R6} [get_ports {Q[4]}]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN R7} [get_ports {Q[3]}]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN U8} [get_ports {Q[2]}]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN T8} [get_ports {Q[1]}]
set_property -dict {IOSTANDARD LVCMOS18 PACKAGE_PIN V9} [get_ports {Q[0]}]