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Question of AddressSetupTime and AddressHoldTime value

ray_shin
Associate

Dear All,

My customer using STM32F205ZG and I have the following issue.

I am accessing dual port memory using FSMC function, but when I measured the waveform, I found that CE(CS) did not increase due to BUSY(WAIT). See picture below.

setting value : "AddressSetupTime" and "AddressHoldTime" values = "0".

Q:

1. What is the minimum value for setting "AddressSetupTime" and "AddressHoldTime"? Can I use "0"?

2. If I use "0", may the CE not increase depending on BUSY?

(When I used "1", it worked fine.)

3. When I set "0" to STM32F205ZF using the same FW, there was no problem, but I was wondering if there is a reason why the problem is occurring in "205ZG" MCU.

waveform picture :

ray_shin_0-1716792238858.pngray_shin_1-1716792262115.pngray_shin_2-1716792319419.png

Best Regards.

Ray shin.

 

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