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8086/8088 Architecture

8086/8088 Architecture. Seven categories of signals. Max/min mode: min mode is used for single procss. Max mode is used for multiprocss Test: synchronize multiple processors Data Enable: generally connected to biriectional buffer to isolate MPU from system bus.

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8086/8088 Architecture

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  1. 8086/8088 Architecture • Seven categories of signals. • Max/min mode: min mode is used for single procss. Max mode is used for multiprocss • Test: synchronize multiple processors • Data Enable: generally connected to biriectional buffer to isolate MPU from system bus. • Data tran/rcvr: controls data flow. • IO or memory: indicates whether the proc cycle is memory operation or IO operation. • Bus High Enable: enble the higher order byte of 16 bit data Power & clock BHE/S7 A19/S6 A16/S3 AD15 AD0 ALE M/IO RD WR DEN DT/R VCC CLK MuX add & status signals GND INTR NMI HOLD READY RESET External rqst Mux add and data buses Response to External rqst INTA HOLDA Control & status signals Multipro envrnmnt TEST MN/MX

  2. Max/min mode control signals

  3. Programming model AX BX CX DX SP BP SI DI CS DS SS ES IP

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