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Asked: May 4, 20222022-05-04T21:42:34+05:30 2022-05-04T21:42:34+05:30In: Microprocessor

Describe the function of the following pins in 8086 maximum mode of operation

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Describe the function of the following pins in 8086 maximum mode of operation:

  1. TEST
  2. RQ/GT0 and RQ/GT1
  3. QS0 and QS1
  4. s0, s1, s2.
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    1. I'M ADMIN
      2022-05-05T10:52:08+05:30Added an answer on May 5, 2022 at 10:52 am

      (i) TEST:

      • TEST pin is examined by the “WAIT” instruction. If the TEST pin is Low, execution continues. Otherwise the processor waits in an “idle” state. This input is synchronized internally during each clock cycle on the leading edge of CLK.

       

      (ii) RQ/GT0 and RQ/GT1 :

      • Request/Grant. These pins are used by local bus masters used to force the microprocessor to release the local bus at the end of the microprocessor’s current bus cycle. Each of the pin is bi-directional. RQ’/GT0′ have higher priority than RQ’/GT1′.

       

      (iii) QS0 and QS1 :

      • Queue Status. These signals indicate the status of the internal 8086 instruction queue according to the table shown below
      QS1QS0Status
      00No operation
      01First byte of op code from queue
      10Empty the queue
      11Subsequent byte from queue

       

      (iv) s0, s1, s2. :

      • Status pins. These pins are active during T4, T1 and T2 states and is returned to passive state (1,1,1 during T3 or Tw (when ready is inactive). These are used by the 8288 bus controller for generating all the memory and I/O operation) access control signals. Any change in S2, S1, S0 during T4 indicates the beginning of a bus cycle.
      S2S1S0Characteristics
      000Interrupt acknowledge
      001Read I/O port
      010Write I/O port
      011Halt
      100Code access
      101Read memory
      110Write memory
      111Passive state
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