Multiprotocol computer bus interface adapter and method

Abstract

A predictive time base generator having predictive synchronizer and replica delay element coupled with the synchronizer feedback delay loop. The predictive time base generator receives a clock signal delayed by a predetermined clock delay and produces a predictive time signal advanced in time by an amount represented by the replica delay element. The replica delay element can replicate one or both of a predetermined clock delay and a predetermined data delay, substantially nullifying the respective delays in critical signal paths of a device. The replica delay element can include replicas of structure(s) found in an incoming clock path and an outgoing data path, such elements including, for example, voltage level shifters, buffers or data latches, multiplexers, wire element models, and the like. A predictive computer bus interface adapter which incorporates the aforementioned predictive time base generator also is provided. Such a predictive interface adapter can be adapted to be observant of stringent bus protocol timing budgets imposed under the PCI and PCI-X local bus protocol, and to be robust relative to variations in design and fabrication processes, and environmental operating conditions.