FSMC configuration for 100pin footprint
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‎2023-12-14 05:55 AM
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
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‎2023-12-14 07:53 AM - edited ‎2023-12-14 07:55 AM
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
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‎2023-12-14 07:53 AM - edited ‎2023-12-14 07:55 AM
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
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‎2023-12-14 08:10 AM
Some reason to choose such an old part over newer, lower power ones?
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‎2023-12-18 12:30 AM
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?
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