Hi Vijay -
--- In "Vijay" <> wrote:
>
> Hi friends,
> Sorry if this has been answered already. I am using a TS-7250 and a
> Cirrus Logic CS4341A DAC. I am trying to connect the two using an I2S
> bus. But, looks like the Ts-7250 does not export any of the I2S pins
> to an external header pin. [ I am just prototyping right now ]
>
> Namely,
> PIN 154 - ARST
> PIN 107 - ABITCLK
> PIN 89 - ASYNC
> PIN 156 - ASDI
> PIN 92 - ASDO
>
> 1. Is my understanding of the 7250 limitation correct?
Yes, the TS-7400 is the only one of the TS ep9302 boards to expose the
i2s pins (i2s or AC97).
> 2. Any suggestions on how I can interface the 7250 to a DAC chip
> using I2S protocol? Would bitbanging using one of the DIO ports be a
> viable solution?
It should be do-able, depending on your frequency. Not sure what
kernel you are planning, but you might want to look at the HRT (high
resolution timers) in recent 2.6 kernels. HRT should help bitbanging
without too high CPU load.
You can also check the list archives, this has come up before.
regards, ..... Charlie
>
> Any help in this regard is appreciated.
> Thanks,
> -Vijay
>
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