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delfino 28341 ROM BOOT Xint parallel mode pin usage confirmation

Colombo Carlo
Mastermind 24170 points

Hello Champs ,

please  customer  is using

XINTF_Parallel_Boot Function   mode .    now   they want to be offcially confimred    XA bus ,  XRD , XZCS6   are in high impedance  during boot , is this true ?

as far as I can see we do not touch them  inside Rom Boot code .  am I right ?

thank you

bye

Carlo

  • 0
    TI__Guru* 92140 points

    Colombo Carlo said:

    Hello Champs ,

    please  customer  is using

    XINTF_Parallel_Boot Function   mode .    now   they want to be offcially confimred    XA bus ,  XRD , XZCS6   are in high impedance  during boot , is this true ?

    as far as I can see we do not touch them  inside Rom Boot code .  am I right ?

    thank you

    bye

    Carlo

    Carlo,

    In the file XINTF_Parallel_Boot.c you will see the configuration for the GPIO MUX in the function   XINTF_Parallel_GPIOSelect();

    The address lines are configured as address lines so they will react to reads from the XINTF zone.

    XZCS6 is also configured as a chip select and will react to reads to zone 6.

    XRDn is on a dedicated pin and will likewise react to any read to any of the zones.

    Cheers,

    Lori

     

     

  • 0 in reply to Lori Heustess
    TI__Mastermind 24170 points

    Hi  Lori ,

    thank you .

    So considering all  data is read at address 0x100000  in Xintf  zone 6  ,     address  and  CS pins  are driven  not tristate .

    am I right ?

    sorry to double check but customer is laucnhing pcb now .

    thank you once again

    bye

    Carlo

  • 0 in reply to Colombo Carlo
    TI__Guru* 92140 points

    Colombo Carlo said:

    So considering all  data is read at address 0x100000  in Xintf  zone 6  ,     address  and  CS pins  are driven  not tristate .

    am I right ?

    Yes, they will be driven when the read occurs.  Address always holds the last value driven.

    Colombo Carlo said:

    sorry to double check but customer is laucnhing pcb now .

    If they are still concerned they can check on a device with a scope to see that the lines are driven.

    -Lori