Counters - how to divide by 160?

[shazia277]

Counters

how can be Divide-by-160 counter achieved?????

 

[Jack// ani]

Re: Counters

80 D Flip-flops arranged is fashion shown below:

**broken link removed**

 

[neils_arm_strong]

Counters

How does this 80 D flip flop arrangement give divide by 160 ?
what about a divide by 16 using 2 such blocks as given in link above followed by a decade counter ?

 

[keith1200rs]

Counters

You most certainly don't need 80 flip-flops to divide by 160! Around 8 would be enough. The crude way to do it is to use a counter with enough bits where they are all available (eg 74HC4040) and then use logic to reset it when the correct number is reached. 160 = 0xA0 so you only need to detect two tbits to know you have reached 160. When The 7th and 5th bits are logic one (assuming bit zero is the lowest) you can reset the counter. A 2 input AND would do it.

The reason it is crude is that you will get a very short glitch of 160 before the counter resets. If this is a problem to you then you need a synchronous counter, but that takes a lot more logic and is easiest to do in a small FPGA/PLD type device.

Keith.