is latch combinational or sequential
Ok, let's go one by one.
1) the difference between combinational and sequential architecture.
RE: A combinational circuit's output depends only on its current inputs. This means, it has a truth table. A sequential circuit's output depends on its previous inputs. This means, it's output will depend on which state it is.
2)What happenes to speed when temprature of a cmos transistor
increases.
RE: Sorry, don't know
3)what is the difference between a flipflop and latch.
RE: A FF is activated by border and a Latch is activated by level. This means, the FF output will be the input that was present at the time we had the clock border(up or down). If the input changes right after the clock border, its output won't change. When it comes to latch, its output changes accordingly to the input while we have a level of voltage(the border means nothing to the latch).
4)what is the difference between a risc and sisc processor.
RE: It's the number of instructions recognized by the processor. RISC stands for Reduced Instruction Set Computer. CISC, stands for Complex Instruction Set Computer. Some say RISC computer tends to be faster and cheaper, since they have a small number of instruction. At the bottom, this saves transistors, but since it has a small set of instructions, it needs higher software work.
5) what is the reason one chooses for state machines.
RE: Instead of what ? Micro-controllers ? I think it is becouse you can make very low power circuits using state machines instead of microcontrolers. You can project your circuit to your needs so you don't waste power in functions you will never use like in the case of the micro- controllers.
I hope my answers helpd you.
mcoster