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移位寄存器:74164.txt
Package: VHDL 的实例程序,共44个.rar [view]
Upload User: easylife05
Upload Date: 2013-03-21
Package Size: 42k
Code Size: 1k
Category:
VHDL-FPGA-Verilog
Development Platform:
C/C++
- -- TTL164 Shift Register
- -- download from: www.fpga.com.cn & www.pld.com.cn
- library IEEE;
- use IEEE.Std_logic_1164.all;
- ENTITY dev164 IS
- PORT(a, b, nclr, clock : IN BIT;
- q : BUFFER BIT_VECTOR(0 TO 7));
- END dev164;
- ARCHITECTURE version1 OF dev164 IS
- BEGIN
- PROCESS(a,b,nclr,clock)
- BEGIN
- IF nclr = '0' THEN
- q <= "00000000";
- ELSE
- IF clock'EVENT AND clock = '1'
- THEN
- FOR i IN q'RANGE LOOP
- IF i = 0 THEN q(i) <= (a AND b);
- ELSE
- q(i) <= q(i-1);
- END IF;
- END LOOP;
- END IF;
- END IF;
- END PROCESS;
- END version1;