Two pin serial bus communication interface and process
AssigneeTexas Instruments Incorporated
InventorLee D. Whetsel
Life of this patent
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Abstract
A two pin communication interface bus and control circuits are used with circuit boards, integrated circuits, or embedded cores within integrated circuits. One pin carries data bi-directionally and address and instruction information from a controller to a selected port. The other pin carries a clock signal from the controller to a target port or ports in or on the desired circuit or circuits. The bus may be used for serial access to circuits where the availability of pins on ICs or terminals on cores is minimal. The bus is used for communication, such as serial communication related to the functional operation of an IC or core design, or serial communication related to test, emulation, debug, and/or trace operations of an IC or core design.
Claims17
A debug circuit comprising:
- (a) a bidirectional data pin;
- (b) a clock input pin;
- (c) shift register circuitry coupled to the bidirectional data pin and the clock input pin and receiving data bits, address bits, and a write bit serially via the bidirectional data pin.
An integrated circuit comprising:
- (a) a bidirectional data pin;
- (b) a clock input pin;
- (c) shift register circuitry having an input coupled to the bidirectional data pin, an input coupled to the clock input pin, data bit outputs, address bit outputs, and a write bit output.
Dependencies are inferred from the claim text.