METHOD FOR GENERATING MULTIPLE SERIAL BUS CHIP SELECTS USING SINGLE CHIP SELECT SIGNAL AND MODULATION OF CLOCK SIGNAL FREQUENCY
First Claim
1. A device for individually selecting a plurality of slave devices coupled to a serial bus, the master device comprising:
- a master serial port interface, configured for coupling to the serial bus, wherein the master serial port interface has an output for transmitting a clock signal from the master device to the plurality of slave devices; and
a processor, coupled to the master serial port interface, wherein the processor is configured to control the master serial port interface to;
modulate the clock signal on the output according to a first manner to select a first of the plurality of slave devices; and
modulate the clock signal on the output according to a second manner to select a second of the plurality of slave devices, wherein the first manner is distinct from the second manner.
1 Assignment
0 Petitions
Accused Products
Abstract
A system includes a serial bus having an electrical net for conveying a clock signal, and a master device and a plurality of slave devices coupled to the serial bus. The master device modulates a clock signal on its output on an electrical net according to first and second manners to select respective first and second of the slave devices. The first manner is distinct from the second manner. In alternate embodiments, the first and second manners are: (1) different frequencies of the clock signal; and (2) pulse trains on the clock signal with different predetermined numbers of clock edges prior to the assertion of a single slave select signal from the master device. In alternate embodiments: (1) each slave detects the first and second manners directly from the master; and (2) a distinct device detects the first and second manners from the master device and generates individual slave selects.
73 Citations
30 Claims
-
1. A device for individually selecting a plurality of slave devices coupled to a serial bus, the master device comprising:
-
a master serial port interface, configured for coupling to the serial bus, wherein the master serial port interface has an output for transmitting a clock signal from the master device to the plurality of slave devices; and a processor, coupled to the master serial port interface, wherein the processor is configured to control the master serial port interface to; modulate the clock signal on the output according to a first manner to select a first of the plurality of slave devices; and modulate the clock signal on the output according to a second manner to select a second of the plurality of slave devices, wherein the first manner is distinct from the second manner. - View Dependent Claims (2, 3, 4, 5, 18, 19, 20, 21, 22, 23)
-
-
6. A system, comprising:
-
a serial bus, having an electrical net for conveying a clock signal; a plurality of slave devices, coupled to the serial bus; and a master device, coupled to the serial bus, wherein the master device comprises an output coupled to the electrical net for transmitting a clock signal to individually select the plurality of slave devices, wherein the master device is configured to; modulate the clock signal on the output according to a first manner to select a first of the plurality of slave devices; and modulate the clock signal on the output according to a second manner to select a second of the plurality of slave devices, wherein the first manner is distinct from the second manner. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A method for a master device coupled to a serial bus to individually select a plurality of slave devices coupled to the serial bus, wherein the serial bus has a single electrical path for conveying a clock signal from the master device to the plurality of slave devices, the method comprising:
-
modulating the clock signal on the single electrical path according to a first manner to select a first of the plurality of slave devices; and modulating the clock signal on the single electrical path according to a second manner to select a second of the plurality of slave devices, wherein the first manner is distinct from the second manner. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
-
Specification