Bus interface circuit for an intelligent low power serial bus
First Claim
1. A method of operation of a serial bus interface circuit in a peripheral device comprising:
- entering a power-on state upon detection of a transmission error over a bus coupled to said bus interface circuit; and
entering said power-on state upon powering-up said peripheral device wherein said bus interface circuit generates an interrupt signal upon entering said power-on state.
6 Assignments
0 Petitions
Accused Products
Abstract
A low power, single master, variable clock rate, daisy-chainable, serial bus connects a bus dispatch (master) to a chain of one or more daisy-chained peripheral devices (slaves). The bus has a bidirectional serial data line, a bidirectional clock line, unidirectional interrupt line, power and ground lines. Each peripheral device includes a first bidirectional signal line, a second bidirectional signal line coupled to the bus clock and data lines, respectively, and an interface circuit coupled to the first and second bidirectional signal lines. The interface circuit includes a first buffer circuit coupled to the first and second bidirectional signal lines, and a second buffer circuit coupled to the first buffer circuit. A control circuit in the interface circuit couples the first and second buffer circuits where in a first mode of operation, the control circuit passes signals on the first and second bidirectional signal lines through the first and second buffer circuits, and in a second mode of operation, the control circuit passes signals on the first and second bidirectional signal lines through the first buffer circuit and configures the second buffer circuit to terminate the first bidirectional signal line. Thus bus power supply line is coupled to the interface circuit and a voltage on the power supply line is used to power the first and second buffer circuits and the control circuit. The bus interrupt line is coupled to the control circuit of the interface circuit. The interface circuit is also coupled to signal lines of the peripheral device.
113 Citations
28 Claims
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1. A method of operation of a serial bus interface circuit in a peripheral device comprising:
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entering a power-on state upon detection of a transmission error over a bus coupled to said bus interface circuit; and entering said power-on state upon powering-up said peripheral device wherein said bus interface circuit generates an interrupt signal upon entering said power-on state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification