Bus arbitration system for granting bus access to devices follow

Details Bus arbitration system for granting bus access to devices follow Bus arbitration system for granting bus access to devices follow

1991-06-06

1994-01-04

Fleming, Michael R.

Communications: electrical

Land vehicle alarms or indicators

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

34082551, 370 856, 3642408, 3642401, 36424292, 364DIG1, G06F 1336

Patent

active

052768872

ABSTRACT:
A bus arbitration system is capable of granting access to an expansion bus to devices following two-wire bus arbitration protocol or a three-wire bus arbitration protocol. The bus arbitration system receives a plurality of bus request signals from a plurality of devices. Each bus request signal is made up of one or more coded pulses and has a predetermined priority. A priority encoder receives the bus request signal and assigns a priority level to each bus request signal. An arbiter determines and stores in memory which bus request signal has a highest priority and whether the device follows two-wire bus arbitration protocol or a three-wire bus arbitration protocol. The expansion bus grants access to the bus to the device having the highest priority once a previous device if any, has relinquished the bus.

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