Communication control unit for selecting a control mode of data

Details Communication control unit for selecting a control mode of data Communication control unit for selecting a control mode of data

1991-08-27

1994-09-20

Coleman, Eric

Boots, shoes, and leggings

3642407, 364260, 3642382, 3642329, 364DIG1, 395325, G06F 300

Patent

active

053496795

ABSTRACT:
A communication control unit includes a central processing unit, a peripheral circuit part for operating the central processing unit, a line interface part for carrying out a call control, a data communication part for controlling a data terminal, a line system bus which couples the central processing unit, the peripheral circuit part and the line interface part, a data system bus which is coupled to the data communication part, an interprocessor interface part which is coupled to the data communication part, and a bus selector part which is coupled to the line system bus, the data communication part and the interprocessor interface part. The bus selector part bypasses the interprocessor interface part and couples the line system bus to the data communication part in a single mode in which the central processing unit controls both the line interface part and the data communication part, and said bus selector part couples the line system bus to the data communication part via the interprocessor interface part in a multi mode in which the central processing unit controls the line interface part and another central processing unit controls the data communication part via the data system bus.

REFERENCES:
patent: 4490785 (1984-12-01), Strecker
patent: 4744078 (1988-05-01), Kowalczyk
patent: 4975838 (1990-12-01), Mizuno
patent: 5140691 (1992-08-01), Austruy
patent: 5297260 (1994-03-01), Kametani

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