Process for digital communication and system communicating digitally
First Claim
1. A method of digital communicating via a three-wire link amonga first unit having at least one serial data input and a write select command output;
- at least two second units, each having a serial data output and a write select command input;
a one-wire serial data communication line interconnecting second unit serial data outputs and said serial data input;
a one-wire write select command line interconnecting said write select command output and said second unit write select command inputs;
a clock wire line interconnecting said first and said at least two second units;
comprising the steps of;
establishing communication from said second units to said first unit by generating from said write select command output a write select command signal to said write select command inputs, thereby establishing which of said second units is allowed to write data on said serial data communication line;
establishing communication from said first unit to said second units by encoding at said first unit upon said write select command signal on said write select command line further data, and decoding said further data from said write select command line at said second units.
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Accused Products
Abstract
According to the present invention, a three-line bus is used for communication between a first digital unit (1) and two other digital units (3). The three-line bus includes a system clock line (SCL) as well as a data transmission line (SD) through which data is sent from the two other units (3), i.e. transmitting units, to the first unit (1), i.e. receiving unit. The system uses an authorization line (WS) for determining which of the two transmitting units (3) is capable of writing data on the data transmission line (SD) and when it can do so. The communication from the first unit (1), now operating as a transmitter, to the two other units (3), now operating as receivers, is made possible by the fact that data signals are also injected in the authorization line (WS) and transmitted through the line together with the authorization control signals.
14 Citations
34 Claims
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1. A method of digital communicating via a three-wire link among
a first unit having at least one serial data input and a write select command output; -
at least two second units, each having a serial data output and a write select command input; a one-wire serial data communication line interconnecting second unit serial data outputs and said serial data input; a one-wire write select command line interconnecting said write select command output and said second unit write select command inputs; a clock wire line interconnecting said first and said at least two second units; comprising the steps of; establishing communication from said second units to said first unit by generating from said write select command output a write select command signal to said write select command inputs, thereby establishing which of said second units is allowed to write data on said serial data communication line; establishing communication from said first unit to said second units by encoding at said first unit upon said write select command signal on said write select command line further data, and decoding said further data from said write select command line at said second units. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for digital communication, comprising:
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a digital processing unit having at least one input for serial digital data and an output for a write select signal; at least two removable further units, each with an output for serial digital data and an input for a write select signal; removable further unit outputs being connected by a first single-wire line to said input of said digital processing unit; said output of said digital processing unit being connected to said removable further unit inputs by a second single-wire line; said digital processing unit and said further units being interconnected by a third single wire line for a clock signal;
said digital processing unit having an encoder operationally connected to said output for said write select signal to encode upon a second line further signals;said two removable further units having each a decoder operationally connected to said removable further unit inputs for said write select signal to decode said further signals. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification