Programmable multi-level bus arbitration apparatus in a data pro

Details Programmable multi-level bus arbitration apparatus in a data pro Programmable multi-level bus arbitration apparatus in a data pro

1995-03-21

1996-06-18

Ray, Gopal C.

Communications: electrical

Land vehicle alarms or indicators

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

3408255, 370 856, 364240, 3642401, 3642426, 36424292, 3642427, 3642429, 364DIG1, G06F 13362

Patent

active

055287670

ABSTRACT:
A programmable multi-level bus arbitration apparatus for computer systems which implements dynamic arbitration for the grant of control over a system bus by one of a number of bus master devices. A number of programmable restricters each receive a system bus request signal issued by a corresponding one of the bus master devices competing for the control over the system bus. The restricters block or relay the bus request signal. A programmable priority arbiter receives an output of each of the restricters for arbitration to grant control of the system bus to a selected one of the bus master devices based on a pre-programmed priority scheme. A communication protocol handler receives and monitors the status of the bus enable signal for generating a bus busy signal to control the issuing of a verified bus request signal by one of the restricters or the blocking of the bus request signal based on the status of the bus busy signal.

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