[vdr] Re: Increasing SDRAM on DVB cards

[Stefaan Coddé <stefaan.codde@pandora.be>]

Joerg Schneide

>>Klaus wrote:
>> which I respect) that the SCS2 pin is not routed outside from under 
>> the AV7110 chip on the Technotrend DVB-S cards. Since all these cards

>> (Siemens, Hauppauge,...) apparently use the same board layout, I
guess 
>> this pretty much means that it is not possible to extend the SDRAM of

>> this card.
>> 
>> Well, would have been nice...

>Maybe its possible without the 2. CS line:
>If the bus connected to the single SDRAM chip is _only_ used and active
>for this single chip and nothing else (like interfacing between other 
>internal or external devices), it may be possible to use the inactive 
>state of the 1.
>CS line to activate a second SDRAM chip.
>Another way may be to misuse an unused, but connected port pin to 
>generate a second CS.

ah... split the CS1 line to an inverter which makes 0>1 and 1>0
So if CS1 goes high (1) then CS2 goes low (0)

umm... that needs many changes in the firmware and the switching must be
done within the time spec.
Still, nice idea




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