Hi one,
I think you have a SRAM on your PIC, not an SDRAM! SDRAM's are very
complicated to talk to. They are used for high memory amount >1MB and
are not compatible to a PIC.
It's possible to use a serial RAM on your PIC, but it is very slow. Each
access has to be serialized (by software) and that takes time. Additionally
such serial devices are small. Manufacturer of such devices are:
Philips: (PCF8570)
Dallas/Maxim: (DS1200)
ST: (M41T256Y)
Another possibility is to use a CPLD that does the serial/parallel conversion
and the RAM-access.
Bye