How to configure FSMC for the task?

[t2399]

Posted on November 11, 2014 at 10:26

Hi, All.

 ??????? ???, All!

I need connect MCU to

http://galios.ru/content/doc_shdsl_b1h_v14.pdf

, but I can't understand, how should comfigure FSMC. I'm using STM32F407VG (then it will replaced to STM32F103VC). I have read descriptions MCU and AN2790, but it didn't help me.

 What I want?

I have &sharpCS, &sharpWR, &sharpRD, &sharpA0 ('♯' means inverted) and D0..D7 data/adress. ST says in the AN it 8080-like type. I need NOR interface. Ok, but I still have one problem.

 For multiple read or write the device need 'read' ( or 'write' in second case) condition, then clean, then set 'read' again, ...

 I can select adress over connecting &sharpA0 of device to A9 of MCU. But how to configure FSMC for save possibility read/write miltiple values in the same register?

 I think about external gate for &sharpWR and &sharpRD, managed by CLK.. I very hope, it can be decided over configure FSMC.

http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/CD00201397.pdf

, see page 11.

http://galios.ru/content/doc_shdsl_b1h_v14.pdf

, page 48 (It isn't english!)

PS: Sorry my enlish.

b.r., Oleg

#fsmc

[waclawek.jan]

Posted on November 11, 2014 at 10:41

I don't quite understand what's your problem. Try to describe it in more detail. (I do understand Russian a bit, but others here probably don't).

JW

[t2399]

Posted on November 11, 2014 at 11:08

 I asked

http://caxapa.ru/558839.html

. Look it, please. Maybe you catch more...

 And for other.

So, on the picture 'read' operation from device. It can autoincremen adressing.. no. One more time - device has FIFO register, wich register  - it defined by value from ADR register (select by #A0). It means, I should read values from the same adress few times without second (3-th, 4-th,...) select addres. Like burst mode, but for 'write' operation also. On the picture, after Trz I should reset #WR ( =0), read data(i+1), set #WR, and repeat that some time.

[waclawek.jan]

Posted on November 11, 2014 at 12:25

I still don't quite understand your problem.

Simply connect directly the /RD, /WR, /CS, data as appropriate, and address to any address pin (N). Then, accessing any address which falls into respective FSMC area and has bit N cleared accesses the address register of modem; accessing address which has bit N set accesses the data register.

If you are concerned about back-to-back writes/reads, they are probably separated by 1 cycle by default (the datasheet/RM is unclear about it), and this time can be increased by setting the BUSTURN field

Review the waveforms in FSMC chapter of RM0090, the timing parameters the datasheet, and have a look at [DEAD LINK /public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/memory%20with%20long%20write%20recovery%20time%20with%20FSMC%20of%20STM32F407IG&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=712]this thread.

JW

[t2399]

Posted on November 12, 2014 at 08:17

 Thank you!

 Did I read this Reference Manual esterday? Yes, of course. Few times. But didn't see waveform diagrams! Don't ask me  - 'how'. I'm confused.

 So, I'll use Mode A and 9 pins for data-adress. The highest (A8) will use as data/adress signal.