Monday, May 17, 2010

Read/Write bus cycle difference in minimum and maximum mode

Given in the diagram below is the 8088 chip and 8288 chip connection in maximum mode. Explain the read / write difference between maximum and minimum mode operation in 8088 chip.

 Diagram: Maximum mode connection

Table: 8288 Command Table
 In minimum mode, the read and write command signal are generated by 8088 using the WR' and RD' pin.

In maximum mode, the control signal to read and write are generated by external chip which is 8288. The corresponding command include MRDC' (for read) and MWTC (for write).

The following two diagram depic the difference for Read bus cycle in both minimum and maximum mode.

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