FSMC configuration for 100pin footprint

[nanjun]

Hello,

I would like to implement a 64 Mbit PSRAM for the MCU F207VGT6 with a 100 pin footprint.

There are 22-bit address pins and 16-bit wide data pins on required by the IS66WVE4M PSRAM.

How can I configure this MCU in CubeIDE?  It is shown that Data/Adress: max 24bits. Do the data and address share pins ?  

Attached is the screen shoot of this configuration.

Kind regards,

Neo

[waclawek.jan · Accepted solution]

In the 100 pin packages, the lower addresses (A0-A15) are not available.

If your memory needs them (i.e. if it is not a memory with built-in address/data demultiplexer), you have to use a higher-pin-count package; or, if your application is OK with decreased bandwidth and additional hardware use a multiplexed address/data mode and external demultiplexer (esentially a 16-bit latch).

Read the relevant portion of FSMC chapter in Reference Manual.

JW

[Tesla DeLorean]

Some reason to choose such an old part over newer, lower power ones?

[nanjun]

Hello,

since the RMII is necessary in our application, the F207 could be a proper option for it. The  F427 is more costly and it consumes more current when we have a look in the sleep mode. Do you mean F407?