In some cases the memory that stores the microprogram is rewritable, making it possible to change the way in which the CPU decodes instructions.
12.
He was responsible for extending the 80286 architecture and instruction set to 32-bit, and then led the microprogram development for the 80386 chip.
13.
For example, simulators have been used to debug a microprogram or sometimes commercial application programs, before the program is downloaded to the target machine.
14.
Microcode simplified the job by allowing much of the processor's behaviour and programming model to be defined via microprogram routines rather than by dedicated circuitry.
15.
A CPU that uses microcode generally takes several clock cycles to execute a single instruction, one clock cycle for each step in the microprogram for that instruction.
16.
After the microprogram is finalized, and extensively tested, it is sometimes used as the input to a computer program that constructs logic to produce the same data.
17.
A logically equivalent "'transistor matrix "'is still used as the control store or microprogram or'decode ROM'in many modern microprocessors.
18.
Most operations could be performed in 150 ns, however the cycle time was variable from 125 ns to 200 ns under microprogram control so that timing could be optimized.
19.
Even though the computer was complex, its " control store " holding the microprogram would stay relatively small, and could be made with very fast memory.
20.
Writing microcode is often called "'microprogramming "'and the microcode in a particular processor implementation is sometimes called a "'microprogram " '.
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