68300

development,\ufffd\ufffd\ufffd�\ufffd

	Maybe you can have a look at the DSACK signal,I remember that one
time I tied DSACK line to the wrong level(CPU can't end the memory write
and read) and the system can not boot.

======= 2004-09-02 10:14:00 \ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\u0434\ufffd\ufffd\ufffd\ufffd=======

>Hello All,
>         I am facing a very curious problem related to expansion of 
>memory. I used to access 1 MB of RAM using 4 chip selects (CS0, CS1, CS2, 
>CS10).
>       I got a ciruit from Mr Liubo, which I am using to access 4 MB of 
>RAM using the 4 chip selects along with SIZ1, SIZ0, A0, RW.
>
>         The circuit works fine but I added a header to the circuit which 
>connects to a daughter board. The problem I face is that as soon as I 
>connect a cable (even without the daughter board connected at the other 
>end) the system fails to initialize.
>         Pull out the cable and the board initializes, and if the cable 
>length is less than 5 cm the board initializes.
>
>        The signals going to the header are D8-D15, A1-A6, PORTF1, RW, 
>RESET, AVEC(I/O), DSACK1(I/O) and CS4.
>
>   When I connect a debugger I get an error that there is an error 
>writing to the registers initializing PortE. Siz0 and Siz1 are part of 
>PortE, so that is probably the problem.
> 
>    Does anybody have any suggestions.
>
>
>Thanks & Regards,
>Philip Jones,
>Engineer,
>R&D Department,
>ID Technologies. (A division of mark elektriks)
>============================================================
>B1/1, Sai Sahawas Apt.,  | Phone: +91-20-4003315, 4007158
>Oppo. Corporation Bank,  | TeleFax: +91-20-5410479
>Maharshi Karvenagar,     | Email: development@...
>Hingne (Bk),             | www.markelektriks.com
>Pune - 411052. India.    |
>============================================================
>
>
>
>
>
> 
>Yahoo! Groups Links
>
>
>
> 

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\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffdboliu@...
\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd\ufffd2004-09-03