Bus bridge circuit having configuration space enable register fo

Details Bus bridge circuit having configuration space enable register fo Bus bridge circuit having configuration space enable register fo

1996-02-20

1996-11-12

An, Meng-Ai T.

Boots, shoes, and leggings

3642402, 3642405, 36424292, 364DIG1, 36493546, 36492691, G06F 1336

Patent

active

055748694

ABSTRACT:
A configuration space enable/disable mechanism for transferring configuration data to and from peripheral components coupled to one or more peripheral component buses. Bridge circuits implement four configuration modes: a NORMAL mode, a BLOCK mode, a CONFIG mode, and a PASS mode. The configuration mode of each bridge circuit is controlled by writing to a configuration space enable (CSE) register. The BLOCK mode blocks predetermined types of accesses in order to allow configuration access through a peer bridge circuit. The CONFIG mode maps preselected types of accesses into configuration space accesses. The PASS mode passes the preselected types of accesses to the secondary bus to allow configuration space access through a bridge circuit in one of the lower levels of the hierarchy.

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