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Frame Sync Edge Detection does not work on ADSP-21469

Question asked by kenfred on May 5, 2011
Latest reply on May 20, 2011 by kenfred

Hello,

 

I recently discovered the following from the chip anomaly document:

 

http://www.analog.com/static/imported-files/ic_anom/ADSP-21467_21469_anomaly_rev.D.pdf

 

"15000007 - Frame Sync Edge Detection (FSED) feature in SPORT TDM mode does not work:
DESCRIPTION:
The newly defined Frame Sync Edge Detection (FSED) feature in SPORT TDM mode does not work. This feature was introduced to ensure
that when a SPORT is operating in TDM mode with external clock and frame sync, it waits for an active edge of the external frame sync
signal before initiating SPORT RX/TX transfers, regardless of whether it was enabled during the time of the frame sync signal being at an
active level.
WORKAROUND:
Do not set the FSED bit (bit 2 within the SPCTLNn register). This will ensure that the SPORT functions identically as on prior products."

 

I assume this means that TDM mode must operate in a level detection mode.  Does that mean I should monitor the external FS and only enable the SPORTs when the FS is logic low?

 

Thanks!

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