Well, if it's an ARM7TDMI, then it's an ARM7TDMI - what else?
ARM7 - 32 Bit base architecture with
- T - Thumb instruction set, therefore an ARMv4T micro architecture, so no more 26 bit addressing.
- D - Debug extension (JTAG-Port)
- M - Fast multiplier
- I - enhanced ICE support
That's what ARM sold and Nintendo bought. Or more precisely, they bought an ARM7TDMI-S core, the synthesizable version, one that can be integrated with other parts into a single chip. And that's what they did :)
Good one stop shops for information to start might be
For more information RC might not be the perfect forum, as it's still actual technology.