ARM7 TDMI is an ARM7 core, which does not have cache or write buffer. T indicates it supports Thumb instruction set; D indicates that this core enables for enhanced debugging via a JTAG port. M indicates the core supports long multiplication and I indicates it supports break points and watch points.

ARM926 EJ-S belongs to ARM9 family. It includes cache MMU. It includes tightly coupled memory. E indicates it supports enhanced DSP instructions. J indicates it supports Java acceleration technology. S means it is delivered as VHDL source code. It includes Thumb.