Hi @赵壮钦,
Let me share you the links of the package information related to MPC7448 which will help you.
PBGA Packaging Customer Tutorial: https://www.nxp.com/docs/en/package-information/PBGAPRES.pdf
PBGA Packaging Customer Tutorial: https://www.nxp.com/docs/en/package-information/CBGAPRES.pdf
Regards,
Mrudang