Re: [microblaze-uclinux] CS8900 10Mb Ethernet

[Aurelian Lazarut <aurelian.lazarut@xxxxxxxxxxx>]

Hi Johan

I just finished a tiny board with cs8900 to see how it goes, my
connections with the FPGA are much less than the ISA bus, I was trying
to keep the pin count to a minimum

a short list of signals:

DATA[0:15] data lines bidirectional
ADDRESS[1:3] only 3 lines - without ADDRESS[0] which is not used in 16
bit transfer mode 
AEN address latch enable (used as chip select, will register the address
internally on falling edge so basically will be used as ALE and CSn)
IOW, IOR read and write signals
INTRq interrupt signal
 
that's all
the unused address lines are connected to GND, with 2 exceptions the
AD[8] and AD[9] which simulate the address 0x300h to always match the
default address for the CS8900 (basically is hardwired in the 0x300
address range)

the bottom line is that I don't need a bridge for this but I'm still
interested in your IP   

On Tue, 2004-03-09 at 22:18, johan@itee.uq.edu.au wrote:
> Hi Aurash,
> 
> I am the one who have developed the IP interfacing a cs8900. It is in fact a 
> bus bridge between OPB and ISA. It works as it should as far as I know. 
> Unfortunately the CS8900 chip didn't arrive before I left Australia (I'm on my 
> way back to Sweden). I made some other tests though, I made an on-chip ISA GPIO 
> that had the same functionality as the OPB GPIO (but much more simplified), and 
> it seemed to work fine.
> 

what about a test bench for simulation the behavior?

> John has the core, and so do I. But I can't give it to you before I'm back in 
> Sweden. Is this something that would be of interest for you? I can give you 
> some support on the core when I'm back home. I am also very interested in 
> learning about bugs that you might find.
> 
I can try to simulate the bridge by putting together a test bench.

I was thinking that we can attach an old VGA card or even a sound
blaster ? (maybe I got carried away a bit)

 
> Cheers
> Johan
> 
> 
Aurash
> 
> Quoting Aurelian Lazarut <aurelian.lazarut@ntlworld.ie>:
> 
> > Hi John,
> > 
> > I know from a previous post that somebody there in Queensland is working
> > on a design with CS8900 ethernet chip (a student if I remember
> > correctly) can you tell me in which stage is the project (if it started)
> > I've designed already a board with cs8900 (16 bit I/O mode) to be
> > connected with a spartan3 board (the PCB only) and I'll start to make an
> > IP to connect the chip to the OPB bus
> > maybe we can share some info regarding this to avoid duplication here 
> > ;-)
> > to be honest I'm more concerned by the sw driver,in the hw land I'm more
> > confident of positive results - 
> > 
> > 
> > Cheers,
> > Aurash
> >       
> > 
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> 
> 
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