Patent ID: 6175247
Filing Date: 2001-01-16
Classification: H03K

Abstract:
A context switching logic cell with data sharing for use in a context switching system, comprising:a programmable logic unit connected from an address/data input for implementing at least one programmable logic function for a corresponding context,a context memory connected from the function control memory and including a plurality of registers for storing and providing as an output the results of context dependent logic operations, the plurality of registers includinga plurality of private registers, each private register corresponding to a context and being addressable only within the corresponding context for storing and providing as outputs the results of logic operation in the corresponding contexts,at least one public register addressable within all contexts for storing and providing as outputs the results of logic operations within all contexts, andan active register for storing and providing as an output the results of logic operations for a current context, andcarry logic for receiving a carry bit and generating a carry bit output dependent upon the received carry bit and a current logic operation.