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US 10,379,160 B2Granted
Serial communication control
AssigneeArm Limited
InventorsRussell John Buckett, Ian Craig McFarland, Robert John Walker
Life of this patent
Estimating the term…
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AssigneeArm Limited
InventorsRussell John Buckett, Ian Craig McFarland, Robert John Walker
Estimating the term…
An apparatus 2 for performing serial data communication with a target device 4, such as an integrated circuit, utilizes serial transfer circuitry 16 to perform a serial transfer of data to a communication register 26 in the target device 4 and serial retrieval circuitry 18 to retrieve an acknowledge signal 32 indicating whether or not the target device is ready to perform further processing following such a transfer. Delay control circuitry 20 serves to apply a predetermined delay period following the transfer of the serial data via the serial transfer circuitry before initiating the retrieval of the acknowledge signal. This predetermined delay period is controlled in dependence upon the ready status indicated by the acknowledge signals retrieved such that the proportion of acknowledge signals retrieved which indicate an unready status meets a predetermined condition, such as being less than a non-zero predetermined value. The serial communication may take place via JTAG serial scan chains and require moving the controlling state machine 14 between a shift state and a capture state.
Apparatus for performing serial communication with a target device, said apparatus comprising:
Apparatus for performing serial communication with a target device, said apparatus comprising:
A method of performing serial communication with a target device, said method comprising the steps of:
Dependencies are inferred from the claim text.