Data crossbar switch

Details Data crossbar switch Data crossbar switch

1987-08-04

1991-12-10

Hecker, Stuart N.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

34082589, G06F 100

Patent

active

050723669

ABSTRACT:
A crossbar switch consists of a control computer, and a switching matrix which includes a number of switching cells in which connections between data input lines and data output lines are made. The switch operates to simultaneously connect to data output lines initially active data input lines and disconnect therefrom inactive data input lines. Each data input line is associated with an activity logic circuit which monitors activity on the line. The activity logic circuits connect to the control computer and inform it when an inactive data input line becomes active and requires a connection. The activity logic circuits further inform the control computer of the status of connected data input lines each time the control computer performs a connection operation. To make a connection, the control computer energizes a column enable line corresponding to the requested data output line and leaves de-energized the column enable lines corresponding to the other data output lines. It similarly energizes the row enable line corresponding to the initially active data input line. Coincidence of energized row enable and column enable lines at a switching cell causes it to latch into a state in which it connects its input line to its output line. The coincidence of an energized column enable line and a de-energized row enable line at a switching cell causes it to latch into a state in which previous connections are severed.

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