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AM5746: SDR104 mount issue

rei
Mastermind 6155 points

Part Number: AM5746

Hi Experts,

Customers are using AM5746 and TI-RTOS. They cannot be mounted using older standard SD cards.
The tuning process fails when using the UHS1 SDR104 on custom board.

They have questions about "AM574x Technical Reference Manual Rev1 spruih8b" in the 26.5.1.2.4 SDR104/HS200 DLL Tunig Procedure on page 7156. In the Figure 26-51 and 8th flow, Repeat steps 2 through 7 with the following values loaded in the FORCE_SR_C bit field.

In several repeat loop, when CMD19 response and the Tuning Block Pattern Comparison fail, it become MMCHS_AC12[23] SCLK_SEL= 0x0 in 9th flow and Tunig Procedure fail.

Question 1:
Would you tell me the 0/1 condition of MMCHS_AC12[23] SCLK_SEL?
Due to tuning failure, MMCHS_AC12 [23] SCLK_SEL = 0x0 and SD card mounting fails.

Question 2:
If the tuning process fails, they want to retune. Would you tell me the solution?

AM574x
CCS v8
GCC GNU v6.3.1(Linaro)
HW AM57 Custom Board
SW pdk_am57xx_1_0_11
bios_6_76_00_08
XDCTools 3.50.3.33
ICE Lauterbach

Regards, Rei

  • 0
    TI__Genius 10180 points

    Rei,

    What is the older standard SD card customer is using?  Please help dump the MMCHS registers as well as the failure log that shows the tuning result; make sure to include all PASS/FAIL result for each delay ratios.  Also check the I/O and power voltage rails to make sure there are no accidental dip in the levels.

    Moreover, have you checked the latest errata to make sure all applicable changes are implemented in customer software?

    Regarding your questions:

    1. SCLK_SEL is set when there is a valid tuning ratio to use.  This bit is cleared if there are no passing results from tuning

    2. Set SRD and SRC and recall the tuning process.

    Best Regards,

    Shiou Mei 

  • 0 in reply to Shiou Mei Huang
    Mastermind 6155 points

    Hi ShiouMei,

    Thank you for your reply!

    SD card is SDR104. Is required information the Parts(product) name? I told this to the customer. Please wait a moment.

    Regards,

    Rei