Bus system having a system bus, an internal bus with functional units coupled therebetween and a logic unit for use in such system
AssigneeMotorola, Inc.
InventorsAnil Gercekci, Roland H. Schwarz
Life of this patent
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Abstract
A bus system has a main bus and an internal bus. The main bus is coupled to a number of driver units which drive data onto the main bus and to receiver units which respond to that data and provide response data to the main bus. A logic unit provides two-way communication directly between the main and internal buses and allows testing of individual driver and receiver units independently of other units.
Claims8
A bus system comprising a main data bus, a functional block having one or more unidirectional driver units and one or more unidirectional receiver units, and an internal data bus, the one or more unidirectional driver units and one or more unidirectional receiver units being coupled between the main bus and the internal bus wherein data on the internal bus is not accessible during testing of the one or more unidirectional driver and receiver units, and logic means provides two way test access between the main and internal buses for individual testing of the one or more unidirectional driver and receiver units, wherein the logic means provides driver test data placed on the internal data bus by a driver unit under test to the main data bus for verification of the driver unit functionality, and wherein the logic means provides receiver test data to the internal data bus such that a receiver unit under test receives the receiver test data from the internal bus and transfers the receiver test data to the main data bus for verification of the receiver unit functionality.
Dependencies are inferred from the claim text.