Patent ID: 7051256

Claim:
An emulator for emulating the operation of data processing circuitry normally connected to and cooperable with a peripheral circuit, comprising: A. serial scanning circuitry adapted to be connected to the peripheral circuit for, when connected to the peripheral circuit, providing to and receiving from the peripheral circuit signals which would normally be provided and received by the data processing circuitry during normal cooperation between the data processing circuitry and the peripheral circuit, the serial scanning circuitry being adapted to be connected to an emulation controller for transferring serial data from the emulation controller to the emulator and from the emulator to the emulator controller, and the serial scanning circuitry including a first state machine having plural states controlling the transferring serial data; and B. control circuitry connected to the serial scanning circuitry and adapted to be connected to the emulation controller for, when connected to the emulation controller, effecting the providing and receiving of signals and the transferring of serial data continuously without interruption while the first state machine remains in one state.