Using memory mapped external memories with SMIF on TraveoII

[sobuc_3832691]

Hello,

I have a question related to memory mapping and how it works in case of writing data.

Assuming I have a serial flash connected to the SMIF peripheral, as I understand it's no problem to use the XIP mode to read data. However, for writing data I heard that using XIP is not possible because the writing implies 2 SPI commands sent to the serial flash: WREN and the write command.  

What about the same situation, but with an FRAM connected instead of serial flash? The FRAM also needs the WREN command before being able to write anything. I am not sure if there's any difference.

The question is can we use memory mapping to write data to external memory? Will the SMIF know to convert the write data instruction into the 2 SPI commands and send them to the external memory?

Thank you!

Sorin

[Apurva_S]

Hi @sobuc_3832691 

Could you please tell me the part number of the Traveo T2G device which you are planning to use?

Regards.

[JJack]

Hi sobuc_3832691,

maybe my answer is completely wrong (I have absolutely no experience with SMIF) but I give it anyway.

Please look at this register (SMIF_DEVICE_WR_CMD_CTL):

It enables to give 2-byte (16-bit) commands. What if you set  CODEH = 06H (WREN) and CODE to the value of the actual write command you want the flash device to execute?

CODEH will be transmitted first (WREN) immediately followed by the flash manipulation (e. g. write) command.