Method and apparatus for adaptive clocking for boundary scan...

Details Method and apparatus for adaptive clocking for boundary scan... Method and apparatus for adaptive clocking for boundary scan...

G - Physics

01

R

G01R 31/28 (2006.01) G01R 31/3185 (2006.01) G01R 31/3193 (2006.01)

Patent

CA 2273603

A boundary scan controller and method. The boundary scan controller generates an output clock for shifting output data to a target device as a serial stream. The boundary scan controller generates another clock for receiving a serial stream of input data from the target device. The input clock is generated after the output clock according to a predetermined delay. The predetermined delay provides a period of time for the target device to respond to the serial stream of output data. The boundary scan controller comprises a clock generator for generating a system clock, a transmit module having a transmit clock generator and an output data register, a receive module having a receive clock generator and an input data register, and a state machine controller. The receive module includes a delay counter for generating a delay between the transmit and receive data clocks.

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