Digital control system
First Claim
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1. A digital control system having two control lanes which are selectively operable to control an apparatus, each lane comprising:
- a digital computer;
input and output devices;
an input-output bus for connecting said devices to said computer;
means responsive to selection of that lane as inoperable to control said apparatus for isolating said computer from said input-output bus; and
an interface unit, said interface unit including;
means, responsive to a signal selecting that lane as operable to control said apparatus, for transmitting data from said computer to the input-output bus in the other lane and for receiving data from the input-output bus in said other lane;
means, responsive to a signal selecting that lane as inoperable to control said apparatus, for transmitting data from said input-output bus to the computer in said other lane, and for receiving data from the computer in said other lane;
means for generating an indicating signal for separate groups of data transmitted; and
means responsive to indicating signals from the other lane for generating control signals for handling an indicated data group from that other lane.
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Accused Products
Abstract
A digital control system for a gas turbine engine comprises two identical control lanes each of which includes a digital computer, two data buses, input circuits, output circuits and an interface unit. Each interface unit is arranged to multiplex data on the buses and transmit this data serially through a connection. Each interface unit is responsive to receipt of data from the other unit to generate control signals (read, write and valid address) for the received data, so that, in addition to timing signals on a further connection data only is transferred between the lanes.
21 Citations
11 Claims
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1. A digital control system having two control lanes which are selectively operable to control an apparatus, each lane comprising:
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a digital computer; input and output devices; an input-output bus for connecting said devices to said computer; means responsive to selection of that lane as inoperable to control said apparatus for isolating said computer from said input-output bus; and an interface unit, said interface unit including; means, responsive to a signal selecting that lane as operable to control said apparatus, for transmitting data from said computer to the input-output bus in the other lane and for receiving data from the input-output bus in said other lane; means, responsive to a signal selecting that lane as inoperable to control said apparatus, for transmitting data from said input-output bus to the computer in said other lane, and for receiving data from the computer in said other lane; means for generating an indicating signal for separate groups of data transmitted; and means responsive to indicating signals from the other lane for generating control signals for handling an indicated data group from that other lane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification