Wait state in 8086 instruction

26 Aug 2017

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A wait state is a delay experienced by a computer processor when accessing external memory or another device that is slow to respond. It requires single phase clock with 33% duty cycle to provide internal timing. 8086 is designed to operate in two modes, Minimum and Maximum. It can prefetches upto 6 instruction bytes from memory and queues them in order to speed up instruction execution. After returning from the interrupt, it fetches the wait instruction once more and continues with the 'wait' state. Thus the execution of the portion of a program, On the other hand, main memory has latency in the range of 15-30 ns. This mismatch results in a wait state for the microprocessor, as a result slowing the overall In particular, the 8086 processor samples the READY line at the rising edge of T3. If READY is low, a Tw state is inserted after T3. A “wait” state is of the same duration as a clock cycle. The wait-state generator was created to insert one or two extra clock cycles When this pin is pulled low, the microprocessor will freeze until it goes high again. A wait state is a situation in which a computer program or processor is ( RAM ) that sends it instructions, it is set to go into a wait state for one or more clockwait state is a delay experienced by a microprocessor when accessing external memory or another device that is slow to respond. 21 Apr 2016 8086 bus cycle(Machine cycle) with timing diagrams. •A wait state generator can be connected to the RDY pin of clock generator to control the READY pin. Instruction Cycle • Time taken by processor to execute an