Arbitration apparatus employing token ring for arbitrating betwe

Details Arbitration apparatus employing token ring for arbitrating betwe Arbitration apparatus employing token ring for arbitrating betwe

1996-10-21

1999-03-30

An, Meng-Ai T.

Multiplex communications

Wide area network

Packet switching

395729, 395730, 395731, 395672, 395674, 370450, 370447, 370452, 370448, 370455, 370431, G06F 1314

Patent

active

058900012

ABSTRACT:
Arbitration apparatus is described for arbitrating between a number of jobs, for example for distributing message traffic over a data transmission network. The arbitration apparatus comprises an activity register containing a number of activity bits indicating which of a number of transmission jobs is currently active. The apparatus also includes a two-tier token ring arrangement comprising an outer ring and a number of inner rings. Each ring consists of a number of registers, holding a token which is passed cyclically around the ring. Each register has a bypass path which bypasses the register if a corresponding job or group of jobs is inactive. The positions of the tokens in the rings determines which job is to be scheduled next. Each ring also includes a keeper register for preserving the token if all the jobs are inactive.

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