标题: 如何AHDL编写4 bit Latch电路 [打印本页]

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作者: a0931727149    时间: 2023-1-31 18:49
标题: 如何AHDL编写4 bit Latch电路
请问先进 如何用AHDL编写 4 bit Latch  电路 ,

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作者: xuyaqi    时间: 2023-2-1 14:25
为什么非要AHDL，用VHDL或Verilog HDL不行吗，后两者既通用资料还多。

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作者: angmall    时间: 2023-2-2 08:11
这是将锁存器的输入连接到称为 data_in 的输入线的 AHDL 代码，
锁存器的输出到称为 data_out 的输出线，以及到输入的使能线
称为 latch_enable：

下面是指定八位锁存器的方法：

1. Latch
   
2. A latch in AHDL has two inputs – D and En, and one output Q. When En is low, the output
   
3. Q does not change. When En is high, the output Q is equal to the input D. Thus, when En is
   
4. low, it will hold the value which was on the D input when En went from high to low. To use
   
5. a latch in AHDL, declare it in the VARIABLE section of the program:
   
6. VARIABLE
   
7. A : LATCH;
   
8. will define a one-bit latch. To specify what should on the D input of A, use A.d. To specify
   
9. what should on the En input of A, use A.ena. To use the Q output, refer to A.q.
   
10. Here is the way to specify an eight-bit latch:
    
11. VARIABLE
    
12. A[7..0] : LATCH;
    
13. Here is AHDL code to connect the inputs of the latch to input lines called data_in, the
    
14. outputs of the latch to output lines called data_out, and the the enable lines to an input
    
15. called latch_enable:
    
16. 
    
17. SUBDESIGN my_latch
    
18. (
    
19. data_in[7..0] : INPUT;
    
20. latch_enable : INPUT;
    
21. data_out[7..0] : OUTPUT;
    
22. )
    
23. VARIABLE
    
24. A[7..0] : LATCH;
    
25. BEGIN
    
26. A[].d = data_in[];
    
27. A[].ena = latch_enable;
    
28. data_out[] = A[].q;
    
29. END;
    

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