RU2275682C2 - Device for transferring data between computer and peripheral devices - Google Patents

Abstract

FIELD: computer science, possible use for transferring data between computer and peripheral device, made in form of universal serial bus, including cable with signal lines, power buses and sockets.

SUBSTANCE: device has micro-chip of controller, generating commands, controlling operation of peripheral device and micro-chip of controller, controlling directions of transferred data streams, and also additionally has at least two relay microchips, connected by first and second external electrodes to outputs of controller microchips, and by third and fourth external electrodes - to cable, synchronizing impedances of cable and controllers, and transforming signal levels from outputs of controller microchips for allowing their transfer along cable without reflection of signals therein. Each one of relay microchips contains receivers and transmitters, which by differential outputs are connected to external electrodes of microchips. Microchips have logical block, generating signals for transmitters, permitting transmission of data to external electrodes of micro-circuit. Additional micro-circuits may be positioned, for example, in sockets at ends of cables.

EFFECT: increased distance of communication between personal computer and peripheral devices.

6 cl, 2 dwg

Description

The invention relates to the field of local area computer networks, in particular home networks on universal serial buses.

Serial data transfer buses are known for peripheral devices such as a mouse, keyboard, printer, modem, and hard disk [1].

Also known devices for transmitting data between a computer and peripheral devices, made in the form of a universal serial bus, including a cable with signal lines, power buses and connectors at the ends to connect peripheral devices to a personal computer, a controller chip that generates commands that determine the operation of the peripheral device and a controller chip that controls the directions of the streams of transmitted data located in the peripheral device [2]. These conditions are, by technical nature, closest to the claimed result and are selected as a prototype.

The disadvantages of the known devices for communicating personal computers with peripheral devices are:

- restrictions on the distance of transmission of packets of digital information;

- high complexity due to the complexity of the electrical signal transponders;

- high complexity due to the presence of cable splitter devices.

The technical result of the present invention is to increase the communication distance of a personal computer with peripheral devices.

Another technical result is to simplify the design and reduce the cost of data transmission devices made in the form of universal serial buses.

These technical results were achieved in a device for transmitting data between a computer and peripheral devices, made in the form of a universal serial bus, including a cable with signal lines, power buses and connectors at the ends for connecting peripheral devices to a personal computer, a controller chip that generates commands that determine the operation peripheral device and the controller chip that controls the directions of the streams of transmitted data located in the peripheral device, which additionally contains at least two repeater circuits, the first and second external electrodes connected to the outputs of the controller circuits, and the third and fourth external electrodes - connected to the cable, matching the impedances of the cable and the controllers and converting the signal levels from the outputs of the controller circuits located in personal computer and peripheral device, to ensure their transmission via cable without reflection of signals in it.

The second variant of a specific embodiment of the device according to the present invention is characterized in that each of the above additional relay microcircuits contains first and second receivers connected by differential inputs to the first, second, third and fourth external electrodes of the microcircuits, respectively, and the outputs to the inputs of the first and second, respectively transmitter, which differential outputs are connected to the third and fourth external electrodes of the microcircuits, while the microcircuits contain a timer device ystvo connected to the logic unit generates enable signals for the transmitters transmit data to the external electrodes of the chip, whose inputs are connected to the outputs of the receivers and the outputs to the control inputs of the first and second transmitters.

A third embodiment of a particular embodiment of the device according to the present invention is characterized in that additional microcircuits are located in connectors at the ends of the cables.

A fourth embodiment of a particular embodiment of the device according to the present invention is characterized in that one of the additional microcircuits is located in a personal computer, and the second in a cable connector.

The fifth embodiment of a particular embodiment of the device according to the present invention is characterized in that one of the additional chips is located in the peripheral device, and the second in the cable connector.

The sixth embodiment of a specific embodiment of the device according to the present invention is characterized in that the additional chips are made on CMOS type elements.

The present invention is illustrated by the drawings.

Figure 1 shows a schematic diagram of a device for transmitting data between a personal computer and a peripheral device according to the present invention.

Figure 2 shows a block diagram of a relay chip.

A device for transmitting data between a personal computer 1 and peripheral devices 2, according to the present invention, is made in the form of a universal serial bus and includes: a cable with signal lines 3 and 4, power buses (not shown) and connectors 5 and 6 at the ends for connecting peripheral devices with a personal computer, the controller microcircuit 7, forming the commands that determine the operation of the peripheral device, and the controller microcircuit 8, which controls the directions of the transmitted data streams, located s in the peripheral device 2. The device further comprises at least two identical microcircuits 9 and 10, the functional block diagram of which is shown in figure 2. The microcircuits have the first 11 and second 12, the third 13 and fourth 14 external electrodes, the first 11 and second 12 connected to the outputs of the microcircuits of the controllers 7 and 8, and the third 13 and fourth 14 - with the signal lines 3 and 4 of the cable. Chips 9 and 10 convert the signal levels from the outputs of the chips of the controllers 7 and 8, located in the personal computer 1 and peripheral device 2, to ensure their transmission via cable without reflection.

Each additional chip 9 and 10 contains the first and second receivers 15 and 16, connected by differential inputs respectively to the first 11, second 12, third 13 and fourth 14 external electrodes of the microcircuits 9 and 10, and the outputs to the inputs of the first and second transmitter 17 and, respectively 18, which are connected by differential outputs to the third 13 and fourth 14, first 11 and second 12 external electrodes of microcircuits 9 and 10. The microcircuits 9 and 10 contain a timer device 19 connected to a logic unit 20, the inputs of which are connected to the outputs p receivers, and the outputs - to the control inputs of the first and second transmitters 17 and 18, generating signals for transmitters transmitting permission signals to the external electrodes 11, 12, 13, 14 of microcircuits 9 and 10.

In a specific embodiment of the data transmission device according to the present invention, additional microcircuits 9 and 10 may be located in connectors 5 and 6 at the ends of the cables.

In the second embodiment, one of the additional microcircuits 9 can be located in the personal computer 1, and the second 10 in the cable connector 6.

In the third embodiment, one of the additional microcircuits 10 may be located in the peripheral device 2, and the other 9 in the connector 5 of the cable.

In the fourth embodiment, additional microcircuits can be performed on CMOS type elements.

The device according to the present invention operates as follows.

In standby mode, the outputs of the controller 7 are in the states of logical "0" and logical "1", respectively. When this state changes, in the relay circuits 9 and 10, the direction of data transfer from the controller 7 of the personal computer 1 to the controller 8 of the peripheral device 2 is set. The direction of the data transfer is set by the logical unit 20, which generates a data transmission permission signal for the transmitter 17 to the external electrodes 13 and 14. After that, a digital data packet is transmitted from the outputs 13 and 14 of the relay chip 9 to the signal lines 3 and 4 of the cable. When the state of signal lines 3 and 4 changes, the logic device 20 generates a control circuit 10 that activates the transmitter 15. The relay chip 9 transmits data using pulsed signals of lower amplitude (~ 0.5 V) compared to the amplitude of the output signal (~ 3.3 V) controller 7. Since the output impedance of the transponder chip 9 is selected equal to (45-55) Ohms, that is, equal to the input impedance of the cable, the device provides reliable data transmission without reflection of signals in lines 3 and 4 This allows you to increase the length of communication lines 3 and 4 in the data transmission device according to the present invention, up to 25 and more meters. The decrease in the amplitude of the signal in the data relay chip 9, which comes from the output of the controller 7, provides less power consumption and less generation of interference in the device. A packet of digital data from communication lines 3 and 4 is supplied to the inputs 13 and 14 of the relay chip 10 and, through the transmitter 15, is transmitted to the bidirectional inputs of the controller 8.

The transmission of data packets from the peripheral device 2 to the personal computer 1 is carried out as described above.

The device for transmitting data, according to the present invention, can be widely used in computer networks, in particular home, for connecting a personal computer with various peripheral devices, such as a video camera, printer, etc.

Literature

1. M. Dolle, A Dynamic Line-Termination Circuit for Multireceiver Nets, IEEE Journal on Solid-State Circuits, vol. 28, NO.12, December 1993, pp 1370-1373

2. Han Shu, USB Multi-Function Connecting Device, United States Patent 6058441, May 2, 2000.

Claims (6)

1. A device for transmitting data between a computer and peripheral devices, made in the form of a universal serial bus, including a cable with signal lines, power buses and connectors at the ends for connecting peripheral devices to a personal computer, a controller chip that generates commands that determine the operation of the peripheral device and a controller chip that controls the directions of the streams of transmitted data located in the peripheral device, which additionally contains at least two relay circuits with the first and second external electrodes connected to the outputs of the controller microcircuits, and the third and fourth external electrodes with the cable, matching the impedances of the cable and the controllers and converting the signal levels from the outputs of the controller microcircuits located in the personal computer and peripheral device, for ensuring their transmission by cable without reflection of signals in it. 2. The device for transmitting data according to claim 1, characterized in that each of the mentioned additional relay microcircuits contains first and second receivers connected by differential inputs to the first, second, third and fourth external electrodes of the microcircuits, and outputs, respectively, with the inputs the first and second transmitters, which are connected by differential outputs to the third and fourth external electrodes of the microcircuits, while the microcircuits contain a timer device connected to the logic unit, operating signals for transmitters operating for transmitters on the external electrodes of the microcircuit, the inputs of which are connected to the outputs of the receivers, and the outputs to the control inputs of the first and second transmitters. 3. A device for transmitting data according to claims 1 and 2, characterized in that the additional microcircuits are located in the connectors at the ends of the cables. 4. A device for transmitting data according to claims 1 and 2, characterized in that one of the additional microcircuits is located in a personal computer, and the second in the cable connector. 5. A device for transmitting data according to claims 1 and 2, characterized in that one of the additional microcircuits is located in the peripheral device, and the other in the cable connector. 6. A device for transmitting data according to any one of claims 1 to 5, characterized in that the additional microcircuits are made on CMOS type elements.

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