Why Asynchronous Reset in our Design ?

[imbichie]

Hi All,

Why we are using Asynchronous Reset in our Design...?

What are the advantages of Asynchronous Reset...?

What happens if we use Synchronous Reset...?

Thanks in Advance..

 

[guguwuwu]

If we adopt an asynchronous reset, it can take effect immediately. But I do't think we have to use the asynchronous Reset。

Refer to the following website：
http://forums.xilinx.com/t5/PLD-Blog/That-Dangerous-Asynchronous-Reset/ba-p/12856

---------- Post added at 13:36 ---------- Previous post was at 13:27 ----------

Addionally，we spend more device resourses using synchronous reset, but make less mistakes.

 

[ravics]

Thanks @guguwuwu for the link. WP272 & WP275 are a must read.

 

[TrickyDicky]

It really depends on the device.
In Altera devices, all resets are asynchronous. Sync resets in the code are actually created by muxing the input to a D input. But Xilinx devices have a specific Sync reset on all registers.