Re: Hands on PCI interface ...
From: Jonathan Kirwan (jkirwan_at_easystreet.com)
Date: 02/04/05
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Date: Fri, 04 Feb 2005 02:07:49 GMT
On 3 Feb 2005 15:12:33 -0800, aiiadict@gmail.com wrote:
>Modern computer with PCI only, need to plug in an ISA card.
The southbridge or PCI-ISA bridge chip can only exist with "side-band" channels
to the main chipset. There is only one of these possible, and then only if the
rest of the chipset supports the southbridge concept. The side-band channels do
not exist as signals on the PCI bus, so I don't believe that it would be
possible to do a PCI board that provides full ISA -- more particularly, support
for ISA DMA. You might be able to get by with some specialized FPGA or ASIC for
the purposes of a reduced ISA feature set connecting to the PCI (no DMA and with
subtractive decoding for the ISA address space.)
I haven't heard of such a thing, though.
Jon
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