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expansion bus J9 - BitsyXb dauther board

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Anritsu

0 Posts

Posted - 24 Oct 2006 : 05:51:30

Hi.

We´r working on making an interface to the system bus on the bitsy Xb personality board. (the J9 connector)

Is this possible when the ethernet phy is the this (J9) at the same time?

Hope you understand our question.

Regards
Lars Sauer

rwhaley

628 Posts

Posted - 24 Oct 2006 : 11:45:19

I'm finding it somewhat difficult to understand the question. I'll take my best shot at it anyway. If your question is:

Is it possible to have a BitsyXb personality board with an ethernet chip present plus some other chip and have them share the bus?

Then the answer is:

Yes, it makes things much more complex, but it is possible. An example of this is our Quad UART Personality board that has both a UART and a Ethernet chip. To make this possible a CPLD was used on the personality board to decode addresses and provide chip selects.

Note that the bus provided to the Personality board is a PCMCIA bus from the PXA processor. It would be quite difficult, if not impossible, to use the bus as both a PCMCIA (or CF) slot and also support an ethernet chip. This is because a PCMCIA slot would require the whole address space on the bus with no addresses left over for other devices.

akidder

1519 Posts

Posted - 24 Oct 2006 : 17:46:32

This issue is also discussed at topic 846.

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