Patent ID: 8634508
Filing Date: 2014-01-21
Classification: G01R,G06F,H04B,H04J,H04L

Abstract:
1. A selection circuit comprising: A. a serial data input lead, a serial data output lead, a clock input lead, a mode input lead, and an enable output lead; B. shift and update circuitry having control inputs, an input connected to the serial data input lead, an output coupled to the serial data output lead, and an enable output coupled to the enable output lead; and C. state machine circuitry having a clock input connected to the clock input lead, a mode input connected to the mode input lead, and control outputs connected to the control inputs of the shift and update circuitry, the state machine circuitry stepping though only the states of Idle, Capture, Shift Data, Update Data, and back to Idle, in that order with no intervening states, in response to changing signals on the clock and mode inputs.