Dual mode bus bridge for interfacing a host bus and a personal c

Details Dual mode bus bridge for interfacing a host bus and a personal c Dual mode bus bridge for interfacing a host bus and a personal c

1995-12-27

1998-10-27

Teska, Kevin J.

395281, 395306, 395307, 395308, G06F 9318

Patent

active

058288651

ABSTRACT:
The dual mode bus bridge accommodates either two 64-bit personal computer interface (PCI) buses or four 32-bit PCI buses. In either case, only a single load is applied to the host bus. The dual mode bridge includes a bridge controller unit connected to a pair of expansion bridge units by respective internal buses. Each expansion bridge unit includes two sets of 64-bit wide queues and buffers. For 32-bit PCI operation, the two sets of queues and buffers are operated in parallel. For 64-bit PCI operation, the two sets of queues and buffers are linked together so as to appear in series to provide a single queue structure having twice the depth of the separate queue structures for a 32-bit mode operation. As such, undue duplication of queue and buffer resources is avoided. Method and apparatus embodiments of the invention are described.

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