Data exchange interface that directly transmits control signals

Details Data exchange interface that directly transmits control signals Data exchange interface that directly transmits control signals

1998-07-27

2000-10-10

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output access regulation

710 23, 710107, G06F 1300

Patent

active

061311332

ABSTRACT:
A communication system includes a data exchange interface which is coupled via an internal bus to a microprocessor and a DMA unit. For controlling the data exchange, the interface transmits control signals either to a microprocessor or a DMA unit. The control signals are acknowledged each time. For realizing an efficient data exchange via the interface, the interface is an I.sup.2 C bus interface with minimum load of the microprocessor, and transmits a first group of control signals by a first control line to the DMA unit and a second group of control signals by a second control line to the microprocessor. By respective settings of the interface, a selectable part of the control circuitry may be transferred from the microprocessor to the DMA unit. The total number and type of control signals (interrupts) which correspond each to a specific mode of the interface may be retained.

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