AM625: DDR sysconfig

Part Number: AM625
Other Parts Discussed in Thread: SYSCONFIG

Hi:

    1. About the entry for the tXPR parameter of DDR sysconfig, the calculation method the FAE told us is: minimum value of the changed value = max(5nCK, tRFC(min)+10ns). 

    But TI default value is 5, so should we enter 5 here , or the value obtained from the FAE's calculation formula?

    2. There are 2 sysconfigs, the only difference is: the tDQSCK is 0.225 , another is 0.18.

    But the board_ddrReginit.h generated from the 2 different sysconfigs are same. 

  • 1. You should only enter the tCK component (5).  The ns component is calculated based on tRFC

    2. It is likely the change in value wasn't large enough to change any of the registers.

    Regards,

    James