Method and apparatus for performing multiplexed and non-multiple

Details Method and apparatus for performing multiplexed and non-multiple Method and apparatus for performing multiplexed and non-multiple

1993-11-29

1996-01-09

Bowler, Alyssa H.

Static information storage and retrieval

Magnetic bubbles

Guide structure

395550, 395800, 395410, 36518902, 36523002, 364DIG1, 3642329, 364238, 364240, G06F 1338

Patent

active

054836603

ABSTRACT:
Method and apparatus for performing multiplexed and non-multiplexed bus cycles in a data processing system (10). The present invention allows a data processing system (10) to switch from multiplexed bus cycles to non-multiplexed bus cycles, and vice-versa, without requiring the data processing system (10) to be reset. In one embodiment of the present invention, a single user programmable control bit (90) is used to select whether an external bus cycle will be multiplexed or non-multiplexed. In more complex embodiments of the present invention, the ability to switch between multiplexed external bus cycles and non-multiplexed external bus cycles may be achieved by way of a plurality of user programmable register fields (96, 100, 102, and 104) located in registers 44. The plurality of user programmable register fields (96, 100, 102, and 104) may be associated with one or more chip select signals.

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Motorola, Inc., MC68332 User's Manual, Chapter 4: System Integration Module, pp. 4-27 through 4-46, 1990.

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