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F28M35H52C: Read external RAM Register value exception

Part Number: F28M35H52C

Hi team,

Here're few questions from the customer may need your help:

1) There are some questions about configuring EPIOS31--A20 usage when using the TI MCU F28M35 official routine EPI_SRAM_8bit.

Why dose it require to pull high when reading and configure the output mode when configuring? A20 is not present in HB8 mode, why is it used? 

2) If the customer use HB16, they also need to use A12, but only A11, can the following pins also be selected as per the routine? 

3) When using the PJ4_GPIO60 pin as a read-write command to the external RAM, short it to 3V3 to read the external RAM register value, and a simple pull-up does not work. Why? 

Could you help check this case? Thanks.

Best Regards,