The difference between VFPv4 and VFPv3, between SIMD2 and SIMD?

Dear, I am developing projcet using cortex-A8, I optimize some algorithm code on cortex-A8 cpu. The code shall be ported to cortex-A15 in near future, I got some information about BEON and VFP from website...
The difference between VFPv4 and VFPv3, between SIMD2 and SIMD?

Dear, I am developing projcet using cortex-A8, I optimize some algorithm code on cortex-A8 cpu. The code shall be ported to cortex-A15 in near future, I got some information about BEON and VFP from website...
Differences between ST10F269 and ST10F272

We recently tried upgrading a controller product by replacing an ST10F269 chip with an ST10F272. The Keil development environment seems to work. However, we have a problem when using the HiTex programmer...
difference between volatile and const

I would like to know the difference between volatile and const.Pls. explain it with an example.
Difference between Interrupts and Functions

Hi, Iam new to the microcontrollers,could u pls explain what is the difference b/w Interrupt and functions in embedded programing........