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Stefano Zanotti
Stefano Zanotti
Associate
July 4, 2016
Question

STM32Cube Bug - FMC write recovery time

  • July 4, 2016
  • 3 replies
  • 901 views
Posted on July 04, 2016 at 12:50

STM32CubeMX: 4.15.1

STM32CubeF7: 1.4.0

MCU: STM32F746NGHx

In the setting:

''Configuration | FMC | SDRAM1 | SDRAM timing in memory clock cycles | Write recovery time''

the value is constrained in [3,16] (and the help agrees with that).

However, it doesn't agree with the library code (stm32f7xx_ll_fmc.h:288):

#define IS_FMC_WRITE_RECOVERY_TIME(__TIME__) (((__TIME__) > 0) && ((__TIME__) <= 16))
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    3 replies

    slimen
    slimen
    Visitor II
    July 4, 2016
    Posted on July 04, 2016 at 16:13

    Hi,

    From my side, I have in CubeMx: ''WriteRecoveryTime1 must be between 1 and 16'' (as shown in the attached screen).

    Could you please put your screen to have more idea about these parameters and configuration's.

    Regards

    ________________

    Attachments :

    Capture.JPG : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006Htov&d=%2Fa%2F0X0000000aXG%2F_F4ii7Kmf5XwOieXeGuq_vV.Kz8HNYuXSOQ5rCRHK9s&asPdf=false
    Stefano Zanotti
    Stefano ZanottiAuthor
    Associate
    July 11, 2016
    Posted on July 11, 2016 at 08:13

    Attached is my FMC dialog. Do the limits depend on other parameters?

    ________________

    Attachments :

    bug_FMC.png : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006Htp0&d=%2Fa%2F0X0000000aXH%2F7gbBVoy979q8A.5lv9bErmMzBltJA.YlpW0lRKxpoW8&asPdf=false
    stm32cube-t
    stm32cube-t
    ST Employee
    July 21, 2016
    Posted on July 21, 2016 at 10:42

    Dear user,

    As stated in the user manual, we have the following condition:

    TWR >

    ≥

    TRAS - TRCD

    Which means within STM32CubeMX user interface: the write recovery time must be greater than (Self-refresh time - Row to colum delay).

    Playing with the values of self-refresh time (increase) and row to column delay (decrease) , you can reach again the lowest bound value of 1 for the Write recovery time.

    Best regards

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