exactly when is interrupt raised?

exactly when is interrupt raised?

[Shaju Abraham]

Hi all,
        We are working with a cm8738 which is built into the
motherboard. We could not find the data sheets for the chipset. If
someone could direct us to the data sheets of cm8738 it will be great
else one doubt that we have about the card is -

when exactly does the card raise the interrupt in playback mode. Is it
after physically playing out and thus finishing the period_size number
of frames or is it after the period_size number of frames are copied
into the hw buffers(?) of the card?

Exactly at what point does the cm8738 card raise an interrupt?

--Shaju Abraham



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Re: exactly when is interrupt raised?

[Takashi Iwai]

At Wed, 25 Sep 2002 10:41:25 +0530,
Shaju Abraham wrote:
> 
> Hi all,
>         We are working with a cm8738 which is built into the
> motherboard. We could not find the data sheets for the chipset. If
> someone could direct us to the data sheets of cm8738 it will be great
> else one doubt that we have about the card is -
> 
> when exactly does the card raise the interrupt in playback mode. Is it
> after physically playing out and thus finishing the period_size number
> of frames or is it after the period_size number of frames are copied
> into the hw buffers(?) of the card?

this card has no such big hw buffer (nor fifo), so even in the latter
case, the time is almost identical with the prefetched time and
shouldn't be audible.


Takashi


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