Re: [Fx2lib-devel] Change sync delay macro (Daniel O'Connor)

[-t <tg...@ya...>]

Message: 3
Date: Sat, 26 Feb 2011 16:35:36 +1030
From: "Daniel O'Connor" <doc...@gs...>
Subject: [Fx2lib-devel] Change sync delay macro
To: fx2lib developer mailing list <fx2...@li...>
Message-ID: <238...@gs...>
Content-Type: text/plain; charset="us-ascii"

Hi,
I modified SYNCDELAY to match the Cypress version - this is useful because GPIF 
designer generates code which calls it and it's a pain to re-edit the file each 
time you change your design.


--->  Hi Daniel, sync delay is used in more places that just GPIF 
implemenations.  Various registers are gated by different clock domains.  When 
the CPU writes to these specific registers the contents may not be updated 
if the sync delay is not executed.  The amount of delay is dependent on the two 
main clock domains.  All the details of sync delay can be reviewed in the 
Cypress TRM.  This one originally had me scratching my head for several days...  
Hope this helps :)  <---