Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1996-04-23
1997-06-17
Ray, Gopal C.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
395280, 324 731, 371 221, G06F 1300, G01R 3128
Patent
active
056405219
ABSTRACT:
A protocol and associated circuitry operable for efficiently extending serial bus capability to the backplane environment is described. The protocol is designed to coexist and be fully compatible with existing serial bus approaches. The circuitry and protocol required to couple any one of the boards on the backplane to the serial bus master without modifying the existing serial bus protocol, without adding additional signals and without affecting the throughput rate of the serial bus is described. The invention advantageously allows a primary serial bus master to select, communicate with, and deselect multiple serial bus slave boards, each having a remote serial bus master. A command and messaging protocol is described, and the remote serial bus master circuits described are capable of responding to command and data transmissions from the primary serial bus master and autonomously performing high level functions on the local board level serial bus without intervention by the primary serial bus master. Additional selection of boards and communications by the primary serial bus master are made without the necessity of resetting the serial bus, so that high level test functions may be simultaneously executed and monitored on multiple slave boards. Additional preferred embodiments are also described.
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Courtney Mark E.
Donaldson Richard L.
Ray Gopal C.
Stahl Scott B.
Texas Instruments Incorporated
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