[linuxdc-dev] IDE/ISA Interface

[Michael R. <mro...@fu...>]

I'm glad you found the correct part number for the 74ALS245 
transceivers, I've been looking for them (everyone else labels them as 
74245).  They were right in front of me on Kiyoshi's site the entire 
time.  Interestingly enough we don't need them, all they are is simple 
logic to isolate the IDE bus from the parallel port and select which way 
the data can flow, they can be implemented with logic in the Xilinx.  We 
may be able to improve the operation speed too if we use the 7.5 ns 
version of the Xilinx versus the 15 ns version Kiyoshi used.  That's 
half of the delay of Kiyoshi's version.  I'm going to try integrating 
all of the logic into the Xilinx that way I can play around with it and 
add extra logic so you can use multiple devices, etc.  I'll put the 
datasheets for the parts I found up in case anyone needs them.  Also, 
about the programmer, you can build one for about $10.00 from the 
parallel programmer schematic in Xilinx's JTAG manual, I'll post that 
too for anyone whois interested.  Good luck.

Michael Robinson
mro...@fu...
www.fuzzymuzzle.com

Mike Frysinger wrote:

>On Friday 25 June 2004 10:12 pm, Michael Robinson wrote:
>  
>
>>Check out Bitmaster's mirror at my site, he has the IDE schematic there
>>that tells you how to connect your IDE circuit to the Dreamcast:
>><snip>
>>that utilizes currently available components and well document it so
>>people don't have to keep running around trying to figure out how to do it.
>>    
>>
>
>yeah, ive been through all those sites, ive got the parts now to build 
>Kiyoshi's dcext ;)
>http://linuxdc.net/dcext/
>the only real part i'm lacking (due to no schematic/etc...) is that dc ext 
>port that the modem turned into
>-mike
>
>
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