[oc] Async reset: active high or active low?

[Allan Herriman <allan_herriman@agilent.com>]

Hi,
   I'm readying a core for publication on opencores, so I thought I'd 
better check it against the opencores coding standards (since I usually 
write against a proprietary internal coding standard).

I found there were a few contradictory coding standards documents on the 
opencores web site.  In particular, I found one saying that the async 
reset signal should be active high, and another saying it should be 
active low.  I found one that said it should be active high, then gave 
some example code with an active low reset.
(The good thing about standards is that there are so many to choose from.)

So I thought I'd look at some code in some projects.  You guessed it, a 
mixture of active high and active low.  (My sample was very small, so I 
may have missed the trend.)

I realise that the actual polarity doesn't matter that much (since it 
can be inverted in the instantiation), but which is the "right" way to 
do it from the opencores perspective?  Active high or active low?

BTW, my vote's for active high signals wherever possible.

Thanks,
Allan.
-- 
Allan Herriman
Advanced Networks Division    +61 3 9210 5527 Tel
Agilent Technologies, Inc.    +61 3 9210 5550 Fax
347 Burwood Highway  Forest Hill 3131 Australia

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