CCS / TMS320F28377S： Asram question

Tool/software: Code Composer Studio

Hello, I found the following problem when accessing external ASRAM through CS3

1.Data with more than 64K RAM per access is written back

2.ASRAM type:62-65WV25616EALL-BLL-CLL   256k*16bit

What is the cause of this problem?

code example:

gExRam[0]=0x1234;
gExRam[1]=0x4212;
gExRam[65537]=0x1112;