System for providing reprogramming data to an embedded...

Details System for providing reprogramming data to an embedded... System for providing reprogramming data to an embedded...

G - Physics

06

F

342/21

G06F 9/44 (2006.01) G06F 9/445 (2006.01)

Patent

CA 1244917

SYSTEM FOR PROVIDING REPROGRAMMING DATA TO AN EMBEDDED PROCESSOR ABSTRACT OF THE DISCLOSURE A system for providing information to alter the software of an electronic data processor embedded in an electronic module includes a remote reprogramming module that conducts a sequence of operations to provide data to the processor which the processor uses to reprogram itself. The system em- ploys a data link having a bi-directional transmission path connecting the processor and the reprogramming module. A controlled switching circuit is provided at each end of the trans- mission path. Under normal operating conditions, the transmis- sion path is used to transmit a function signal for a function performed by the electronic module. Periodically, the processor operates one switching network to capture the path for trans- mission of a reprogramming inquiry signal to the reprogramming module. At the same time, the function signal is diverted to an alternate path internal to the electronic module. When the reprogramming module detects a reprogramming inquiry, it operates the other switching circuit to gain access to the trans- mission path. Then, in response to commands from the pro- cessor, the reprogramming module undertakes the reprogramming sequence and transfers data to alter program information held in the memory of the processor. Thereafter, both the processor and the reprogramming module operate their respective switching circuits to restore the transmission path to its normal opera- tional use for the transmission of the function signal.

504617

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