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SPORT of SHARC

Started by Ralf Heuser-Lindner May 12, 2000
I have a question about the TFS signal of an
SPORT in an ADSP 21061:

I set up the TFS of SPORT 1 as follows:
Internally generated (ITFS = 1),
data independent (DITFS = 1),
late (LAFS = 1),
active low (LTFS=1).

When SPORT is enabled it works as expected.
When SPORT is disabled (SPEN=0), I would
expect the TFS signal beeing high (inactive),
but I observe it low. Is this correct?

Thanks for any advice.
Ralf Heuser-Lindner



Ralf Heuser-Lindner wrote:
> I have a question about the TFS signal of an
> SPORT in an ADSP 21061:

> When SPORT is enabled it works as expected.
> When SPORT is disabled (SPEN=0), I would
> expect the TFS signal beeing high (inactive),
> but I observe it low. Is this correct?

on my development board (bittware snaggletooth) an inactive TFS
is also low. inactive data and clock lines are high.

according to the manual SPORT data and clock have internal
pull-ups, whereas the frame lines have not.

so your observation seems to be ok.

Michael

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