EPROM emulator

[David A. Cooley]

John,
I have CircuitMaker 6 and TraxxMaker pro...
I'm sure you have something similar (maybe better) but if you need them let
me kno.

-----Original Message-----
From: jgwynne at mrcday.com <jgwynne at mrcday.com>
To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
Date: Friday, February 12, 1999 10:49 AM
Subject: Re: EPROM emulator


>
>
>   In message <Pine.LNX.3.96.990212020658.14316A-100000 at svn.net>, you
write:
>
>| A Cypress cy7c008 or cy7c009 might work
>| http://www.cypress.com/cypress/prodgate/dual/cy7c019.htm
>|
>| Accesses to the same address at the same time are a problem.  Since
>| there's probably no way to make the ECM cpu wait, collisions would have
to
>| be avoided altogether or the ECM cpu should be able to terminate the
other
>| sides memory cycle if needed. The rams mentioned have access times of
20ns
>| or lower compared to the 120ns needed, which may help in the logic design
>| for the collision handling.
>
>
>We need a price quote.
>
>Approach #3.... time multiplex bus cycles with a single fast
>(single port) SRAM. Probably almost 1/2 the chip count, all cheap and
>readily available. I'll sketch up something to get a better idea of
>the part count... Any other approaches?
>
>john
>