Questions about FSMC expansion mode?

lifengstar

Questions about FSMC expansion mode? [Copy link]

The timing rules of FSMC are mode A, B, C, D, mode 1, mode 2, etc. Does the extended mode refer to A, B, C, D? For whom is it extended? Mode 1, mode 2? Please advise, thank you.

hzwwqq

As long as EXTMOD is set to "1", it is extended mode.

STM32_FSMC_EXTMOD.GIF (33.22 KB)

Downloads:0

2010-4-16 14:32

sjx2002

                                 I think the main purpose of FSMC extended mode is to set read and write to different timings. The so-called modes A, B, C, and D are actually not much different.

yimaoqian

                                 What are the concepts of Mode 1 and Mode 2 mentioned in the manual? Can Mode 1 and Mode 2 be set to extended mode? Getting started question, thanks.

tianweiming9527

What are the concepts of Mode 1 and Mode 2 mentioned in the manual? Can Mode 1 and Mode 2 be set to extended mode? Getting started question, thanks.

Look at section 19.5.4 "NOR Flash and PSRAM controller timing diagrams" of the STM32 reference manual, for each mode there is a table listing the possible configurations.

liangmao

                                 Thanks, I understand a little bit.

Swd21ic

                                 It's a question of different timing.

zhanghuan

                                 Learned

zxhnet

                                 I looked it up yesterday, and my understanding is that modes A, B, C, and D can be used in extended mode, that is, if EXTMOD is set to 1, the read and write timing can be any of A, B, C, and D. Mode 1 and Mode 2 cannot be used in extended mode, that is, Mode 1 and Mode 2 can only be used for memory operations with the same read and write timing.