Hmmm ... I thought I counted 2x(9+7) pins. Perhaps there were some parts made
with 28 pins, but that would make it difficult to sort out the selects with
the 40 pins on the module. The 32-pin parts that I have have got two high
selects, a low select, a low enable, and a low write strobe. That would allow
for selecting four banks, wouldn't it? With only 32 pins used for address and
data, that would allow for 8 banks of 64Kx16. Of course, with only 28 pins,
you'd have a select, a write, 8 data, and 16 addresses ... hmmm that would
work too since each pair could be selected separately.
Dick
----- Original Message -----
From: "Tony Duell" <ard_at_p850ug1.demon.co.uk>
To: <classiccmp_at_classiccmp.org>
Sent: Friday, May 03, 2002 5:06 PM
Subject: Re: Need IDT 7M624 Info
> > I believe it could be a 1 Meg SRAM. Thanks for the info about IDT. The 16
> > pieces soldered on the top and bottom seem to have a solder pad pattern of
5
> > on the ends and 9 on the sides. Would this jibe with the 64KX8
configuration?
>
> Possible, just... You have 28 pins, right (2*(5+9))
>
> 64K*8 would need :
>
> 16 address lines
> 8 data lines
> Vcc
> Ground
> Write Enable
> Chip Select
>
> That's 28 connections. I would have expected a separate Output Enable (==
> Read Enable, basically), but it would be possible to manage without it.
> So they could be 64K*8 SRAMs.
>
> -tony
>
>
Received on Fri May 03 2002 - 21:43:45 BST