Access-arbitration scheme

Details Access-arbitration scheme Access-arbitration scheme

1983-11-28

1987-02-03

Heckler, Thomas M.

Boots, shoes, and leggings

G06F 1324

Patent

active

046412662

ABSTRACT:
In a processing system (10) that utilizes daisy-chain arbitration for controlling access to a shared resource (11,13) by a plurality of using devices (1-4,12), a using device (1-4) is allowed to issue an access request signal onto a request signal line (17) shared in common with the other using devices (1-4) only when it senses that the request line is idle. Sensing is done during one clock period and issuance of the request signal is done during the next clock period. The clock period exceeds the signal propagation delay across the request line. Receipt by the arbitrator (14) of a request signal is delayed by a clock period. Access grant signals are daisy-chained by a grant line (18) between the using devices (1-4), without synchronization at each device of issuance of the request signal and receipt of the grant signal, and without multiple sampling at each device of the grant signal. Following receipt of a grant signal, a using device ceases to issue its request signal only upon detecting the end of the grant signal.

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P. Hughes et al., "Multi-Processor Systems", Microelectronics and Reliability, vol. 16, No. 4, 1977, pp. 281-293.
R. P. Loretan, "Timing Problems in Electronic Lockout Chains" (presumed title), source and date unknown.
K. Muhlemann, "Arbiters, Priority Access Conflicts and the `Glitch` Problem", Microprocessors and Their Applications, pp. 391-401 (1979).

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