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Re: Ramtron chip in place of Dallas

 

-CS does more than latch the address. Like DRAM, FRAM uses sense
amplifiers which must be precharged before each read operation. When
-CS is high, the sense amplifiers are precharged in preparation for
the next read operation.

On Tue, 5 Dec 2017 21:17:25 -0500, you wrote:

You got lucky, as the 1225 chip behaves exactly like
the CMOS RAM chip that it contains... a 6116 type.. Your
EPROM programmer happened to do it accidentally right. It
wasn't on purpose as the FRAM didn't exist until a decade
later.

The FRAM is different, its CS is used to latch the address
lines... not to simply enable the bus drivers.

-Chuck Harris
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