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Problem with external HY62256A RAM

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ramasamy

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Hello
I am using HY62256A RAM with P89V51RD Ic , some time RAM is giving wrong data, what could be a problem , is it require pull up resistor in P0 port , as per data sheet for accessing external RAM pull up resistor is not requied.Please any one provide me the solution to over come this problem.
 

Re: External RAM Problem

Hi
Upload schematic of your design

all the best



Bobi
 

Re: External RAM Problem

Does this problem occur within the first 1kB of data RAM?
Maybe somewhere in your code you haven't set the EXTRAM bit to a "1" ..

As far as the pullups are concerned - I would just try them ..

Regards,
IanP
 

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