Abstract: A method for resolving differential signals is provided which quickly and efficiently recognizes signals by resolving differences between the signals using a resolving circuit which is powered by a clock signal. The resolving circuit operates with supply voltage levels as low as one threshold voltage. Also, the signal hold time can be made very small depending on the sizing of certain transistors. Other advantages include reduced power consumption, high speed operation, good rejection of input noise and power supply noise, ability to resolve small (e.g., 1.0 mVolt) voltage differences, and the ability to function with a variety of types of drivers, including HSTL, DTL and PECL.

Abstract: A receiver is provided which quickly and efficiently recognizes signals by including with the receiver a resolving circuit which is coupled to a node control circuit which determines the signals to be recognized. The resolving circuit can operate with supply voltage levels as low as one threshold voltage. Also, the signal hold time can be made very small depending on the sizing of certain transistors. Other advantages include reduced power consumption, high speed operation, good rejection of input noise and power supply noise, ability to resolve small (e.g., 1.0 mVolt) voltage differences, and the ability to function with a variety of types of drivers, including HSTL, DTL and PECL.

Abstract: A fault isolation system for use in an integrated circuit. The fault isolation system includes multiple input shift registers which are connected end-to-end, serial output to serial input, for convenient interface with a test data input and test data output that are controlled by the test access port controller (tap controller) of conventional JTAG circuitry that is frequently provided in such integrated circuits. The multiple input shift registers include parallel inputs which receive test data from test nodes within functional blocks such as general circuit blocks and linear bus alleys. The multiple input shift registers are efficiently controlled by a global controller which talks to many local controllers. The global controller distributes control signals that are received by the local controllers.