What is machine cycle time and instruction time for CC2538 ?

Hi,
I apologize in advance if I am misunderstanding the question, anyway the here's some data.
The CM3 integrated on the CC2538 is clocked by the system clock, which can be up to 32MHz. This gives an instruction cycle time down to 31.3ns for one-cycle instructions.
Instruction time depends on the instruction type (as different instructions may need different cycles) and on the clock speed (or cycle time).
Please check the CortexM3 instruction set and reference manual, as indicated here.
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0337i/CHDDIGAC.html

Thanks,
TheDarkSide