digital audio to FCDEV3B

[Serg l]

Just one problem... Does anybody knows how to remove that epoxy without
damaging the board? C155 has J2 area covered with white compound and those
are not through holes, so they are not accessible on the other side as
well. Any suggestions?


On Tue, Jan 3, 2017 at 5:05 PM, Serg l <serg at tvman.us> wrote:

> Mychaela,
>
> I was looking into vanilla TI DSP datasheet, which should resemble the
> core inside the Calypso chip here http://www.ti.com/lit/ug/
> spru307a/spru307a.pdf and registers mapping document. Based on that MCSI
> got to be a double-buffered SPI which would save us from the frame slips.
>
> It is not clear if TX pins are tri-state, thanks for pointing out to this,
> I just assumed that since it is SPI compliant it just got to be tri-state
> outputs.
>
> Also it could be possible to drive the whole thing in a TDM mode nicely,
> when each bit from the same port is transmitted not every clock tick, but
> in one of 16 positions (channels), this way I can use the same frame sync
> without messing with chip select signals. This functionality seems to be
> not related to the DSP application itself and configurable via control
> registers, which seem to be fully mapped into ARM address space.
>
> I understand your concerns about messing with off-the-shelf stuff, so I
> will just try to play with MCSI off the C155  while you take care of
> FCDEV3B :)
>