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WL1271 SDIO IRQ

Doug DeVries
Prodigy 185 points
Other Parts Discussed in Thread: WL1271

Hi all,

The WL1271 has a dedicated IRQ pin (WLAN_IRQ).   This is fine for use in systems where the WL1271 will be connected to the host CPU directly.  However in systems where the WL1271 must connect to the host CPU only through a atandard SDIO interface, this could present problems.  SDIO multiplexes an IRQ onto SD _DAT[1] line in 4-bit transfer mode. 

Questions

 - Does the WL1271 support the standard multiplexed SDIO IRQ function, or only a seperate dedicated IRQ pin?

- If WL1271 does not support SDIO IRQ directly already, is there a well-known circuit that can be used to multiplex the dedicated IRQ line onto the SDIO D1 line?

Doug

  • 0
    TI__Genius 9240 points

    Hi Doug,

    current 1271 inplementation support dedicated IRQ pin only, and there is no inband interrupt opstion using the SDIO lines. also we dont have a circuit for in band indication.

    Regards,

    Eyal

  • 0 in reply to Eyal a
    Prodigy 185 points

    Hi Eyal,

    Thanks for your fast reply.  The use of the phrase "current 1271 implementation" in your reply leaves me with a follow up question.... 

    Just to be clear, are you saying that the WL1271 hardware (the WL1271 IC itself) does not support in band IRQ indication on the SD_D[1] line, or are you saying that the WL1271 hardware can do it, but the software implementation does not support it?   This is a potentially important distinction for my application.

    Thanks again!

    Doug  

  • 0 in reply to Doug DeVries
    TI__Genius 9240 points

    Hi Doug,

    we use external GPIO in order to enable SDIO operation under platform power management.

    and in that case it is not possible to use the IRQ indication on the SDIO Data bus

    Regards,

    Eyal