Synchronizing a device that has been power cycled to an already operational system
AssigneeTexas Instruments Incorporated
InventorGary L. Swoboda
Life of this patent
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Abstract
A method comprises a system comprising a host device coupled to a first remote device actively operating according to a state diagram that the host device and all remote devices follow during operation of the system. The method further comprises powering up a second remote device while the host device and first remote device are actively operating according to the state diagram. The second remote device waits for a synchronization point sequence. Upon detecting the synchronization point sequence, the second remote device implements a predetermined feature set and synchronizes itself to the state diagram at a common point as the host device and first remote device.
Claims15
A test logic of a test target device, comprising:
- (a) a test clock input configurable to receive a test clock signal of a test bus;
- (b) a test mode input configurable to receive a test mode signal of the test bus;
- (c) test interface logic coupled to the test clock input and the test mode input and having at least an online state and an offline state:
- (i) in the offline state the test interface logic halts test operation even with receiving signals on the test bus and monitors the test clock signal and the test mode signal;
- and
- (ii) the test interface logic is capable of moving out of the offline state to the online state when the test interface logic detects a predetermined packet of the test mode signal input to the test mode input in serial during multiple cycles of the test clock signal.
Dependencies are inferred from the claim text.