Hi Matthias,
My PCB worked. I don't know why (maybe internal capacitance), but I
replaced the 20MHz crystal to another 20MHz from other manufacturer
and both EasyWeb PCBs started working.
I noted that CHIP-ID can be read before chip initialization.
I also read in Cirrus-Logic datasheet that you can do this:
/* Just after reset, before writing anything to CS8900A */
if ( Read8900(0x0A)==0x3000 ) {
/* CS8900A was found */
/* maybe try to read again? :-) */
} else {
/* CS8900A was not found, trouble... */
}
Thanks,
Pedro
On Wed, Apr 30, 2003 at 09:25:11AM -0400, Fend, Matthias wrote:
> hello pedro,
>
> i used the same schematic for my pcb (with the exception that i had to use the
> 5V version of the CS8900)
> and it's working fine.
>
> so i think the schematic is ok - but i don't know if the easyWeb pcb is
> correct
> ???
>
> for testing i added also a debug output (but after chip reset sequence) and i
> got:
> WR:0x0000
> RD:0x630E
> WR:0x0002
> RD:0x0900
>
> i recommend to request the chipo id after reset
>
> try this - then we'll se
>
> matthias
