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TM4C129ENCPDT: Connecting external SRAM on Serial Quad Interface instead of SPI

Darren Jenkins
Genius 11746 points
Part Number: TM4C129ENCPDT
Other Parts Discussed in Thread: EK-TM4C1294XL

Tool/software:

TM4C team,

Our customer is connecting a Serial SRAM device externally.  Part number:

IS62WVS2568GBLL

https://www.issi.com/WW/pdf/IS62-65WVS2568GALL-BLL.pdf

They would like to operate in the Serial Quad Interface (SQI) described on page 12 of the SRAM datasheet.  It looks like we support this mode of operation for a flash device, shown in our referenced design.

Do we have a driver for interfacing with the SRAM in SQI?  Or example software of any kind?

What clock rate is supported in this mode?

Thanks,
Darren

  • 0
    TI__Guru**** 182576 points

    Hi Darren,

      There is no specific example for interfacing with the ISI serial SRAM memory. However, in the TivaWare SDK we have a generic Quad-SPI mode example that can be found at C:\ti\TivaWare_C_Series-2.2.0.295\examples\boards\ek-tm4c1294xl\ssi_quad_mode. 

      Reading the ISI datasheet, accessing serial SRAM should be straight forward. See below figure for a simple byte read operation. Give the READ command (0x03) followed by the 24-bit address and then read the data. I don't think you need a special driver for it.