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Last Post 11 Nov 2016 05:17 AM by Sergey Brandis

Some questions about memory

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Sergey Brandis

New Member
Posts:79

27 Sep 2016 06:41 AM
Hi ! I have some questions What is Read/Write internal flash memory speed in DM3730 SoM? What is number of flash Read/Write cycles? What is maximum communication speed on SD/SDIO card ( I think that I have SDHC controller ,but I don't know speed) What is maximum external parallel bus? How can I configure and invoke interrupt in my application by changing level on uP_DREQ0/GPIO_65 ? Can I process pin/bus interruptes in application layer or only in OS layer? When my WinCe booting I saw this phrase in my log : "yaffs: Partially written block 1462 detected" It is repeated a lot of times and boot time is around 1 minute(that is very long) Can you explain me ,why it is happening? And what should I do to reduce booting time Thanx a lot for your future answers , Sergey !

Adam Ford

Advanced Member
Posts:794

28 Sep 2016 06:51 AM
1 & 2. I'm going to do some research to get the times for the flash. 3. The Maximum speed of the SHDC bus should be 50MHz 4. I am not sure I understand the question. maximum what? Are you referring to the GPMC bus? 5. I will have to talk with a Win CE developer. I know we have a couple published documents on how to use the GPIO, but when I looked through them, I didn't see interrupt usage. (http://support.logicpd.co...talid=0&EntryId=698) and (http://support.logicpd.co...alid=0&EntryId=1137) 6. We have a developer working with a customer on this issue. There appears to be an incompatibility between Logic Loader and the WinCE version of YAFFS which casues the messages and the delays. If you like, we can send you a work-around, but it's not a final fix. adam

Sergey Brandis

New Member
Posts:79

28 Sep 2016 08:20 AM
Hi ! Thanx for your answers. I mean maximum GPMC bus speed ( about fourth question). About first and second question ,can you tell when are going to research about flash? About sixth questions , certainly, send me please work version. Sergey

Adam Ford

Advanced Member
Posts:794

28 Sep 2016 01:35 PM
The data I found on the GPMC clock was located here: http://www.ti.com/lit/ds/symlink/dm3730.pdf It shows the max Frequency of the output, gpmc_clk is 100MHz. What's not as clear is that it is driven by a 200MHz clock (GPMC_FCLK) divided by 2. I am not sure which DM3730 Torpedo model you're using, but I looked up SOMDM3730-20-1780AGIR-D. NAND datasheet is located here: https://www.micron.com/parts/mcp/nandmobile-ddr-sdram/mt29c4g48mazbbakb-48-it I will talk with my colleague and separately e-mail you the patches for YAFFS work-around. adam

Adam Ford

Advanced Member
Posts:794

28 Sep 2016 02:03 PM
I have e-mailed you the LoLo with YAFFS work around. Check your spam filter if you don't see it. It is coming from our platform support ticket system. adam

Sergey Brandis

New Member
Posts:79

11 Nov 2016 05:17 AM
Hi ! I have a some additional questions : 1) Which way can take information about memory in Windows Ce ? (YaffsPart and My device ) 2) Can I use external interrupt in DM3730 on Windows CE ? ?

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