Question:

I want to boot the TMS320F28345 from an external x16 Flash on XINTF.  It looks possible from the datasheet by using Boot Mode 9, but based on forum discussions, the XINTF must be configured first before it can be used.  Is is it possible?

Can I use CS0 or CS7 instead or CS6?

Answer:

The boot ROM configures the XINTF before it jumps to it.  This is described in the boot ROM guide www.ti.com/lit/SPRUFN5  refer to page 19.

Boot mode 9  is "Jump to XINTF x16".  This is the mode you want to use. The address where it jumps is fixed to zone 6 so only XCS6 can be used.

Boot mode 5 is a different load - it pulls data in using the XINTF data pins, but doesn't "jump to XINTF".  This is also described in detail in the boot ROM guide.