Alan McIvor wrote:
>
> Hi,
>
> Does anybody have any details on how to use and interpret the
> RISC_STATUS bits inside the BT878? This and other areas aren't covered
> very well in the Data Sheets. The data sheets mention that there is a
> Technical Reference Manual and a Programmer's Guide but whenever I
> request them from Conexant I get a copy of the Data Sheet. Do they
> actually exist?
>
> Thanks
>
> Alan
The RISC status bits are under software control. They can be monitored
by looking at the top 4 bits of INT_STAT. These map 1:1 with bits
23..20 and 19..16 in a RISC command. When bit 23 is set in a RISC
command, bit 31 of INT_STAT is reset. When bit 19 is set in a RISC
command, bit 31 of INT_STAT is set. Use this together with bit 24 of a
RISC command to trigger an interrupt. You can then read INT_STAT to see
which RISC command caused the interrupt.
-justin
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