Crossbar switch system for always transferring normal messages and selectively transferring broadcast messages from input buffer to output buffer when it has sufficient space respectively
US6032205A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1998 |
| Grant date | Feb 29, 2000 |
| Priority date | — |
| Expiry date | Mar 6, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F15/17375
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.