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K2G PCB Guidlines for QSPI

Takahiro Ogo
Genius 5940 points
Other Parts Discussed in Thread: 66AK2G02

Hi,
My customer is designing their board for 66AK2G02. They wil use QSPI peripheral.
From 66AK2G02 data sheet, I think we can refer to PCB Guidelines for QSPI.




Where is this PCB Guideline for QSPI?
I have already checked an application note for Hardware desing. It's "Hardware Design Guide for KeyStone II Devices"
However, there is no description for QSP in this guide.

Also, we are checking K2G EVM shcematic. there are some temination registers on RCLK line. I don't know we need this...

Best Regards,
Taka

  • 0
    TI__Guru**** 161600 points
    Hi Taka,

    I've notified our HW experts. Their feedback will be posted here.

    Best Regards,
    Yordan
  • 0
    TI__Mastermind 42545 points

    Hi Taka,

    The following guidelines will be provided in future documentation.

    Regards,

    Bill

    • The QSPI interface includes both the QSPI_CLK signal and the QSPI_RCLK signal. For proper operation, the QSPI_CLK must be connected to both the CLK input on the QSPI device and the QSPI_RCLK input. The proper length matching must be achieved and including some additional resistors between these connections can help.
    • If your schematic tool allows, include the length matching requirements based on the diagram below.
    • Place a 0 ohm resistor close to the QSPI_CLK output. This will allow the clock signal to be tuned by allowing a series termination.
    • Place a 10 ohm resistor close to the clock CLK input for the QSPI device. This resistor should be located close to that device.
    • Place a second 10 ohm resistor close to the QSPI device connected to the QSPI_CLK on one end and the QSPI_RCLK on the other end.
    • Length A to B < 450ps
    • Length B to C < 60ps
    • Length A to C =  Length C to D = Length E to F to within 60ps

  • 0 in reply to Bill Taboada
    Genius 5940 points
    Hi Bill,
    Thank you for your kind support. I understood it.

    Best Regards,
    Taka
  • 0 in reply to Takahiro Ogo
    TI__Mastermind 42545 points

    Hi Taka, 

    Please continue to post questions if you see items missing from the documentation. We are still working on the final documentation for the K2G component and it is helpful to get feedback from customers on what is missing.

    Regards,

    Bill