On Thu, 15 Feb 2001, Alan Cox wrote:
> > Doesn't nvidia have a patent on this? I thought one of things they sued 3dfx
> > over was mapping a register over an address range, so burst transfers that are
> > designed to write blocks of memory can write to a single register efficiently.
>
> Well if they did them its laughable. The ancient ISA bus Pro Movie Studio has
> a fifo mapped over a memory range. This is an old old idea. I learned it in
> college from people who thought it was standard things you should know
I did a search, and they do! http://www.delphion.com/details?&pn=US05687357__
What is claimed is:
1. A method for decoding addresses on a bus which provides a burst transfer
mode which may be utilized for rapidly transferring commands to sequential
addresses, the method including the steps of:
addressing a sequence of commands intended for the same address to a
sequence of serial addresses,
transferring the commands on the bus utilizing the burst transfer
mode, and
decoding all of the serial sequence of commands to the same
destination.
This sounds exactly like ignoring the low bits of an address so they all
decode to the same register. They just made it sound fancy.
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