Hi All,
I am Embedded hardware designer. I hear about SDRAM driver, DDRAM driver. Can anyone explain me as what is it?

Regards
sharath

 

These types of memory are hardware, and so operate in specific ways. A driver in software must be able to handle the requirements of each one as to addressing and doing background refreshes.

There is a lot of information online - http://en.wikipedia.org/wiki/Synchronous_dynamic_random_access_memory

http://en.wikipedia.org/wiki/DDR_SDRAM

http://wiki.answers.com/Q/How_is_SD_RAM_different_from_DD_RAM

Of course, each manufacturer will publish complete specs on their memory IC's.

 

because most external memory devices do not have their own clock signals, a driver/controller is necessary to make sure that you do not violate any of the SDRAM/DDRAM timing constraints.

Some examples of these timing constraints can be your address access time (time it takes for the memory module to obtain stable data after an address change), output hold time (time data remains valid after an address change). There are a lot of these timing constraints, so that is why a driver is necessary. To ensure proper interaction between your memory and your other device(s) in your design.

Your driver design might be different depending on what device is using the memory module.