Data processing system for accessing an external device and meth

Details Data processing system for accessing an external device and meth Data processing system for accessing an external device and meth

1995-08-02

1998-03-03

Donaghue, Larry D.

39580038, 395496, 395500, 395310, G06F 1206

Patent

active

057246041

ABSTRACT:
A data processing system (15) allows a user great flexibility in interfacing with a variety of memory devices (50, 55) and external peripheral devices (70, 72). In the data processing system, a control register (300, 400) is provided for dynamically controlling a function of a plurality of byte enable signals (204, 206, 208, 210) provided to any external device. In a first case, the register may indicate that the plurality of byte enable signals should function as a plurality of write enable signals. However, in a second instance, the register may indicate that the plurality of byte enable signals should function as a plurality of byte enable signals. The use of the register to determine a function of the byte enable signals allows a user greater functional flexibility without software intervention and without increasing a number of external integrated circuit pins required to select an external device.

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