PCI bus master with cascaded PCI arbitration

Details PCI bus master with cascaded PCI arbitration PCI bus master with cascaded PCI arbitration

1996-03-06

1999-07-27

Sheikh, Ayaz R.

395299, 395293, G06F 1336

Patent

active

059304871

ABSTRACT:
A PCI bus master supporting cascading PCI arbitration. The cascading arbitration allows another PCI initiator on the same bus to share the request and grant signal pair to/from the PCI central arbiter. This allows two PCI devices to appear as a single source to the PCI central arbiter. When a request and grant signal pair are cascaded, they are connected to a subordinate arbiter contained within the cascading bus master. The subordinate arbiter is connected to an internal request and grant signal pair from the cascading bus master, and to an external request and grant signal pair from the cascaded device. The cascading PCI bus master then arbitrates between its internal request and the external cascaded device request and issues the resulting request to the central PCI arbiter. When the grant signal from the central arbiter is returned, the cascading bus master routes it to the appropriate internal or external device. Thereby, bus master support signals can be expanded without having to add a costly bridge.

REFERENCES:
patent: 4597054 (1986-06-01), Lockwood et al.
patent: 5388228 (1995-02-01), Heath et al.
patent: 5396602 (1995-03-01), Amini et al.
patent: 5557756 (1996-09-01), Spencer
patent: 5598542 (1997-01-01), Leung

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