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PostPosted: Wed Jan 11, 2006 11:59 pm 
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This is the official Data Sheet for the Cirrus Logic 8900a NIC


Attachments:
File comment: Important Information on operating the CS8900a in 8-bit mode
an181.pdf [66.41 KiB]
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File comment: CS8900a General Documentation
cs8900a-4.pdf [2.1 MiB]
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Last edited by RaveGuru on Fri Jan 13, 2006 3:06 pm, edited 1 time in total.
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PostPosted: Fri Jan 13, 2006 2:01 pm 
For RR-Net programming you also need a 2nd datasheet which describes the 8-bit mode a bit further. Some important information from the datasheet:

If you receive a frame from the streaming registers, you have to read the first two 16 bit words in hi/lo order, and all following words in lo/hi order. If you don't do it like this, you will have strange byte skipping effects.

Code example:

LDA $DE09
STA TYPE+1
LDA $DE08
STA TYPE

LDA $DE09
STA SIZE+1
LDA $DE08
STA SIZE

LDA $DE08
...
LDA $DE09
...

etc


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PostPosted: Fri Jan 13, 2006 3:04 pm 
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Very interesting! I had no idea about this! Perhaps that could explain some of the mysterious problems i had with my UDP/IP code...

PS. I've added the Documentation on 8-bit mode! Thanks for pointing it out :)


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