ram memory state of the art

[one]

schematic epm3032

i have an aplication whit 64 kbyts of data i work whit sdram of toshiba, this use many pins of pic, i wanna upgrade my board and have one question?


How dont use an latch, in order to save the pins of pic?


Exist serial memorys of 32kx8?

Exist chips to manage srams memorys ?


thanks

 

[mr_ghz]

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

 

[one]

yes is sram memory many thanks, u know an easy and little cpdl
for recommend me




gracias

 

[mr_ghz]

Hi one,

To make your serial to parallel converter you can use a CPLD from
different manufacturers. One possibility is Altera, a device could be the
EPM3032 or the EPM3064. The design tools (schematic entry or AHDL)
can be downloaded from their website for free.
I think you will also find an example with google how to make such a
converter.

Bye

 

[one]

u know cpld whit 28 pins or less

thanks

 

[mr_ghz]

Mostly CPLD's have much IO-Pins. But they can be obtained in small
packages (TQFP). I don't know a CPLD with 28 pins. Does anybody
know one?

Bye