Apparatus and method for activating and providing multi-core environment on a bus

Abstract

An apparatus and method for activating and providing a multi-core environment on a bus. The method includes the steps of generating an indication signal by a configuration array arranged in a processor core to indicate how one of a plurality of nodes is driven, wherein the processor core is arranged on a multi-core substrate. A configurable multi-core / multi-package logic circuit arranged in a driver controls how the nodes are driven. If the indication signal indicates that the nodes are driven according to a location-based bus terminal rule, a pull-up logic circuit, a first pull-down logic circuit and a second pull-down logic circuit are controlled according to a multi-package signals and one of a plurality of location signals; if the indication signal indicates that the nodes are driven according to a communication protocol based bus terminal rule, the pull-up logic circuit, the first pull-down logic circuit and the second pull-down logic circuit are controlled according to a bus ownership signal. The invention is capable of providing good bus initiative impedance control and keeping required transmission lines characteristics.

Description

technical field [0001] The present invention relates to microelectronics, and in particular to a mechanism for enabling and maintaining multiple processor contexts on a bus that require active control of bus termination impedance, wherein the multiple processor contexts include A processor package substrate (Processor Package Substrate) has a plurality of processor dies on it. Background technique [0002] Currently, in order to support fast incident wave switching (Incident Wave Switching) with low output amplitude (Low Output Swing), the bus architecture provides a point-to-point bus interface (Point- To-Point Bus Interface). In addition to providing a point-to-point bus interface, the bus architecture also requires the microprocessor (or other devices) to provide an internal termination impedance control circuit to dynamically adjust the termination impedance on the point-to-point bus, where the impedance value can generally be selected to match the characteristics of th...

AI Technical Summary

Problems solved by technology

Therefore, driving the I / O signal to the actual pull-up termination impedance will cause high frequency noise (High Frequency Noise), reflection (Reflection), ringing (Ringing), timing offset (Timing Displacement) and other defects

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