Muxed PSRAM

[rigomate2]

Posted on August 14, 2014 at 13:53

Hi!

ST refers to a technology called muxed PSRAM.

As far as I know, this simply means, that the data and address signals share the same IO pins.

All simple and good, but my question is, could someone point me to a PSRAM, which actually is compatible to such an arrangement? I googled a lot, but all I could find was a US patent about this technology.

BTW, my requirement is to drive a TFT (320x240) screen with ST's LTDC (Hsync, Vsyc etc). I would like to be able to use an LQFP100 package, which leaves me the opportunity to have a 8 bit muxed PSRAM as a frame buffer for the display.

See attached STM32Cube file.

Thanks a bunch!

#lmgtfy

[waclawek.jan]

Posted on August 14, 2014 at 14:28

> All simple and good, but my question is, could someone point me to a PSRAM, which

> actually is compatible to such an arrangement?

IS66WVD1M16ALL , for example?

You can also demux address from data using a 16x latch.

JW

[Tesla DeLorean]

Posted on August 14, 2014 at 14:44

http://www.winbond.com/hq/enu/ProductAndSales/ProductLines/MobileRAM/PseudoSRAM/W958D2B.htm

http://www.winbond.com/hq/enu/ProductAndSales/ProductLines/MobileRAM/PseudoSRAM/W957D6HBC.htm

http://www.issi.com/WW/pdf/66WVD1M16ALL.pdf

[rigomate2]

Posted on August 15, 2014 at 13:49

Thanks guys!

I really appreciate it!