External Memory Interface

[shermantec]

Posted on November 30, 2005 at 00:53

External Memory Interface

[shermantec]

Posted on May 17, 2011 at 12:09

Hello Support ,

Could you send me some links or code examples / apps.notes how to use the external memory interface with uPSD33xx family ?

Thx

Amir

[jim239955_stm1]

Posted on May 17, 2011 at 12:09

In PSDsoft, goto the Pin Definitions page and define your lower 8 bit address bus using the ''latched address out -Low byte'' option. I would suggest pa0-pa7. This will give you your lower 8 address lines.

On the same page (under CPLD Output) define an external chip select on the pin of your choice. Later in the Design Assistant you will be able to map that select line to a block of memory as a chip select. Use the rd/wr lines for control. You can also combine the ram/code area if you like using (/rd & /psen == /ram_rd)

The processors AD0-AD7 can be directly used as data lines for standard memory. Remember to read the data sheet on what memory block wins when you overlap memory segments!