Crossbar switch system for always transferring normal messages a

Details Crossbar switch system for always transferring normal messages a Crossbar switch system for always transferring normal messages a

1998-03-06

2000-02-29

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Data transfer specifying

710 52, 710131, 710132, 370230, 370236, 370254, 370419, 370422, 370428, G06F 1500, G06F 1300

Patent

active

060322055

ABSTRACT:
A crossbar switch and a broadcast communication method for use in a parallel computer that avoids an occurrence of deadlock states caused by conflicts for use of a path by a plurality of broadcast messages. The parallel computer, in which a plurality of nodes are connected by a crossbar switch, is provided with output buffer monitoring circuits. A vacant capacity of each of the output buffers is monitored. The vacant capacity of each output buffer is monitored to ensure that it is sufficiently high to store the broadcast message. The parallel computer is also provided with a priority controller in which one of a plurality of broadcast messages is selected when they are input. The message transmission-permit signal is issued to the packet selector circuits only when the broadcast transmission-permit signals for all the output ports for transmitting the message are issued. The broadcast transmission-permit signals are issued only when the vacant capacity of each output buffer is sufficiently high to store a broadcast message.

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