• Resolved

TMUX1574: SPI load fail issue

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Replies: 6

Views: 116

Part Number: TMUX1574

Hello

           Customer use BMC->U119 SPI mux-> load SPI flash and use another path I/O card->U549->U119-> load SPI flash. 

           U119 is TMUX1574 and load SPI flash code is fail. But if change U119  to SN74CB3Q3257. SPI Flash code is loaded successfully. Why is the issue rot cause and the difference? Attached is testing waveform. Thank you. 

Sparrow_09112019.rar

  • Hi

    What is the voltage supply you are using for both switches? What is the maximum SPI clock signal frequency?

    Any reason why you are using two different types of switches SN74CB3Q3257 and TMUX1574?

    The TMUX1574 device was specifically designed for SPI mux applications  and has a wide operating voltage and 1.8V compatible control logic which makes it suitable for many applications including multiplexing SPI lines.

    I am reviewing the scope shots and get back to you with more details.

    Thanks

    Saminah

  • In reply to Saminah C:

    Hello Saminah

                    Supply voltage is 3.3V and 50MHz. if used U119 3257 , BMC load SPI Flash code is fail. But U119 change to TMUX1574 from 3257 . BMC load SPI flash code is successful. We will send compare waveform between  TMUX1574 and 3257 later. Thank you. 

    BR

    Patrick

                   

  • In reply to Patrick Chen:

    Hello

               Attached is customer issue description and testing waveform. Has any comments for this issue? Thank you.

    BR

    PatrickIssue Description.pptx

  • In reply to Patrick Chen:

    Hi Patrick,

    Thank you for sharing the details.

    Looking at the waveforms you shared, we still need some more information to understand the issue.

    Is it possible to share the following information:

    • Board Layout
    • Part No. (other than TI switches you have in the schematic)
    • VIH and VIL for the flash parts
    • Drive Strength and rise time

    You can share the information via email if that works better.

    Thanks

    Saminah

  • In reply to Saminah C:

    Hello Saminah

                 Thanks. We will update the above information while get it from customer Could you help provide your email to me? Thank you. 

    BR

    Patrick

  • In reply to Patrick Chen:

    Sure. please share details at saimnah_c@ti.com.