CN101729189B - Transceivers and Receivers - Google Patents

Abstract

A transceiver and a receiver. The receiver comprises an analog-digital converter, an equalizer, a slicer, a delay unit, a decoder, a selection unit and a control unit. The analog-to-digital converter is used for performing analog-to-digital conversion on the received signal to generate a digital signal. The equalizer is used for adjusting the digital signal and generating an equalized signal. A slicer receives and slices the equalized signal and generates a sliced signal. The delay unit is used for delaying the slicing signal. The decoder is used for determining whether to decode the received equalization signal according to the control signal. The selection unit is coupled to the slicer and the decoder and is used for selecting one of the slicing signal or the output of the decoder as an output signal according to a second control signal. The control unit is coupled to the slicer and the selection unit and used for determining whether the control signal and the second control signal are enabled or not according to the slicing signal and the state of the output signal.

Description

Transceivers and Receivers

technical field

The present invention relates to a transceiver, and in particular to a transceiver and a receiver.

Background technique

In a network communication system, a transceiver device (Transceiver) is usually used as a signal transmission medium. The transceiver device is generally composed of a transmitter (TX for short) and a receiver (RX for short), and the transmitter can be used to output signals, and the receiver can be used to receive signals.

Generally speaking, the transceiver device will not always be in the data transmission state during the signal transmission process, that is to say, the transceiver device will also be in the idle (Idle) state during the signal transmission process, that is, the signal transmission There is no data in the process. In addition, in a Gigabit Ethernet network (GigabitEthernet), the receiver will be equipped with a Viterbi decoder (Viterbi Decoder) to reduce the bit error rate of the signal. Since the Viterbi decoder itself does not have a mechanism for detecting the signal state, that is, the Viterbi decoder does not detect whether the signal is in a data transmission state or an idle state at this time, and the power consumption of the Viterbi decoder is quite large. In this way, the known transceiver device wastes too much power consumption.

Contents of the invention

The invention provides a transceiver and a receiver to achieve the purpose of power saving.

The present invention proposes a receiver suitable for receiving a received signal transmitted by a remote device. The receiver includes an analog-to-digital converter, an equalizer, a slicer, a delay unit, a decoder, a selection unit and a control unit. The analog-to-digital converter is used to perform analog-to-digital conversion on the received signal to generate a digital signal. The equalizer is coupled to the analog-to-digital converter for adjusting the digital signal and generating an equalized signal. The slicer (Slicer) is coupled to the equalizer, receives and slices the equalized signal, and generates the sliced signal. The delay unit is coupled to the slicer for delaying the sliced signal. The decoder is coupled to the equalizer for determining whether to decode the received signal according to the control signal. The selection unit is coupled to the slicer and the decoder, and is used for selecting one of the output equalized signal and the output of the decoder as the output signal according to the second control signal. The control unit is coupled to the splitter and the selection unit, and is used for determining whether to enable the control signal and the second control signal according to the states of the split signal and the output signal.

In one embodiment of the present invention, when the control unit detects that the segmentation signal has the start position of the string character of the data in the received signal, the control signal is enabled, and when the control unit detects that the output signal has the data in the received signal When the end position of the stream character of the received signal and the segmented signal does not have the start position of the stream character of the data in the received signal, the control signal is disabled.

In one embodiment of the present invention, when the control unit detects that the segmented signal has the start position of the data in the received signal, the second control signal is enabled after a preset time interval, and when the control unit detects When the output signal has the end position of the stream character of the data in the received signal and the split signal does not have the start position of the stream character of the data in the received signal, the control signal is disabled.

In an embodiment of the present invention, the above-mentioned decoder is a Viterbi decoder.

The present invention proposes a transceiving device having the above-mentioned receiver.

In the present invention, the control unit in the receiver detects the state of the split signal (that is, the state of the received signal), and generates a control signal correspondingly. That is to say, when the splitting signal (receiving signal) is in an idle state, the control unit disables the above-mentioned control signal; when the splitting signal (receiving signal) is in a data transmission state, the control unit enables the above-mentioned control signal. After that, the decoder decides whether to decode the received signal according to the state of the control signal. That is to say, when the control signal is disabled, the decoder stops decoding the received signal, that is, the decoder is in a stopped state, and the control unit will control the selection unit to select the delayed split signal as the output signal of the receiver , and when the control signal is enabled, the decoder decodes the received signal, that is, the decoder is in the working state, and the control unit controls the selection unit to select the output of the decoder as the output signal of the receiver. In this way, the present invention can effectively reduce the power consumption of the receiver.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a block diagram of a transceiver device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a received signal according to an embodiment of the present invention.

FIG. 3 is a flowchart of a power saving method according to an embodiment of the present invention.

[Description of main component labels]

100: transceiver device

110: remote device

150: Receiver

152: Slicer

154: Decoder

156: Select Unit

158: Control unit

160: delay unit

162: Analog-to-Digital Converter

164: Equalizer

S1: receive signal

ES: Equalized signal

CS: control signal

CS2: Second control signal

OS1: output signal

Idle: idle state

SSD1, SSD2: starting position of string characters

Csreset: during reset

ESD1, ESD2: end position of string characters

Data: Data transmission status

T1, T2: period

S301～S307: each step of the power saving method of the receiver according to the embodiment of the present invention

Detailed ways

FIG. 1 is a block diagram of a transceiver device according to an embodiment of the present invention. The transceiver device 100 of this embodiment can be applied to a Gigabit Ethernet network (Gigabit Ethernet), but its scope is not limited. Please refer to FIG. 1 , the transceiver device 100 includes a receiver 150 . The receiver 150 is used for receiving the received signal S1 transmitted by the remote device 110 . In this embodiment, the received signal S1 is a continuous signal, that is, after the transceiver device 100 starts to operate, the receiver 150 will continuously receive the received signal S1 outputted by the remote device 110 .

Generally speaking, the receiving signal S1 will have an idle state or a data transmission state during transmission. Moreover, when the receiving signal S1 is in an idle state, it transmits voltage signals of 3 levels, that is, "1", "0", and "-1". When the received signal S1 is in the data transmission state, it transmits 5-level voltage signals, that is, "1", "0.5", "0", "-0.5", and "-1".

Please continue to refer to FIG. 1, the receiver 150 includes an analog-to-digital converter (Analog to DigitalConverter, ADC) 162, an equalizer (Equalizer) 164, a slicer (Slicer) 152, a delay unit 160, a decoder 154, a selection unit 156 and control unit 158 . The analog-to-digital converter 162 is configured to perform analog-to-digital conversion on the received signal S1 to generate a digital signal. The equalizer 164 is coupled to the analog-to-digital converter 162 for adjusting the digital signal to generate an equalized signal ES.

The splitter 152 is coupled to the equalizer 164 for receiving and splitting the equalized signal ES to generate split signals. In this embodiment, since the decoder 154 needs a preset time, it can decode the equalized signal ES to obtain a correct decoded signal. Moreover, the slicer 152 and the decoder 154 have different time lengths for the equalization signal ES. In order to avoid that the segmented signal transmitted to the selection unit 156 is not synchronized with the output of the decoder 154 , causing the receiver 150 to generate an erroneous decoded signal. Therefore, the delay unit 160 can be coupled to the slicer 152 to delay the sliced signal.

The decoder 154 determines whether to decode the equalized signal ES according to the control signal CS. For example, when the control signal CS is enabled, the decoder 154 decodes the equalized signal ES, that is, the decoder 154 is in an operating state at this time. On the other hand, when the control signal CS is disabled, the decoder 154 will not decode the equalized signal ES, that is, the decoder 154 is turned off at this time. Accordingly, the receiver 150 of this embodiment can effectively reduce power consumption. In this embodiment, the decoder 154 may be a Viterbi decoder, and is used to process the 5-level voltage signal. In addition, the slicer 152 is used to process the 3-level voltage signal.

The selection unit 156 is coupled to the slicer 152 and the decoder 154, and selects and outputs one of the delayed split signal (the output of the delay unit 160) and the output of the decoder 154 as the output signal according to the second control signal CS2 OS1. For example, when the decoder 154 does not decode the equalized signal ES, the second control signal CS2 is disabled, so the selection unit 156 selects the delayed split signal as the output signal OS1. When the decoder 154 decodes the equalized signal ES, the second control signal CS2 is enabled, so the selection unit 156 selects the output of the decoder 154 as the output signal OS1. In this embodiment, the selection unit 156 may be a multiplexer (Multiplexer).

The control unit 158 can detect the split signal and the output signal OS1 to determine whether to enable the control signal CS and the second control signal CS2, so as to control whether the decoder 154 needs to be closed or to operate, and the selection unit 156 selects the delayed split signal and One of the outputs of the decoder 154 is used as the basis for the output signal OS1.

It is worth mentioning that, in this embodiment, the 3-level voltage signal is processed by the slicer 152 , and the 5-level voltage signal is processed by the decoder 154 . In this way, the bit error rate (Bit Error Rate) when the receiver 150 decodes the received signal S1 can be effectively reduced.

In order to make those skilled in the art understand how to control the operation of the decoder 156, an example will be given below to illustrate. FIG. 2 is a schematic diagram of a received signal according to an embodiment of the present invention. Please refer to Figure 2, the label Idle indicates that the received signal S1 is in an idle state; the labels SSD1 and SSD2 indicate the starting position (Start of Stream Delimiter, SSD) of the data in the received signal S1; the label Data indicates that the received signal S1 is in the data state. Transmission status; the label Crreset indicates the reset period, which means that the received signal S1 is about to change from the data transmission state to the idle state; ESD1 and ESD2 indicate the end position of the data in the received signal S1 (End of Stream Delimiter, ESD) . In this embodiment, for the convenience of description, the states of the received signal S1 are sequentially Idle, SSD1, SSD2, Data, Crreset, Crreset, ESD1, ESD2, Idle, . . . .

Please refer to FIG. 1 and FIG. 2 together. First, the state of the received signal S1 is Idle. Therefore, after the equalization signal ES is processed by the slicer 152 , the state of the generated split signal is also Idle. Therefore, the control unit 158 disables the control signal CS and the second control signal CS2 according to the state of the split signal being Idle, so that the decoder 154 stops operating and the selection unit 156 selects the delayed split signal as the output signal OS1 .

Next, the slicer 152 continues to process the equalized signal ES, and when the control unit 158 detects that the sliced signal has the stream character start position SSD1 of the data in the received signal S1, that is, the received signal S1 is switched from the idle state In the data transmission state, the control signal CS is enabled so that the decoder 154 starts to operate. Since the decoder 154 decodes the equalized signal ES (received signal S1) and decodes it, there will be a period of data processing time, and this data processing time is about the memory length (Memory Length), and this memory length can be determined by the user Adjustment. Therefore, when the control unit 158 enables the control signal CS, and after the preset time (that is, the storage length), when the output of the decoder 154 is an effective decoding signal, the control unit 158 will enable the second control signal CS. The signal CS2 is used to allow the selection unit 156 to select the output of the decoder 154 as the output signal OS1.

Afterwards, the decoder 154 continues to process the equalized signal ES, and the selection unit 156 continues to select the output of the decoder 154 as the output signal OS1. In this embodiment, the received signal S1 is in the last data transmission state and the interval between the next data transmission state is the InterPacket Gap (IPG), that is, the time length of the received signal S1 in the idle state. Therefore, when the control unit 158 detects that the output signal OS1 has the end positions ESD1 and ESD2 of the data in the received signal S1, that is, the packet in the received signal S1 has been transmitted and is about to switch from the data transmission state to the idle state. state, the control unit 158 will then judge whether the packet interval is greater than the storage length.

If the packet interval is greater than the preset time, it means that the received signal S1 has been in the idle state for a long time, that is, the control unit 158 detects that the output signal OS1 has the end position ESD1 of the data in the received signal S1, and at the same time as the above-mentioned It is not detected before or after the preset time that the segmented signal has the start position SSD1 of the next data in the received signal S1. Therefore, the control unit 158 will disable the control signal CS and the second control signal CS2 to facilitate decoding. The device 154 stops operating, and the selection unit 156 selects the delayed split signal as the output signal OS1. Thereby, this embodiment can effectively save the power consumption of the receiver 150 .

Conversely, if the packet interval is less than the preset time, it means that the received signal S1 is in the idle state for a short time (decoder 154 has not processed the previous data, but the next data has already been generated), that is, the control unit 158 When it is detected that the output signal OS1 has the stream character end position ESD1 of the data in the input signal S1, and it is detected that the split signal has the stream character start position SSD1 of the data in the input signal S1 before and after the preset time, Therefore, at this time, the control unit 158 will continue to enable the control signal CS and the second control signal CS2, so that the decoder 154 can continue to operate, so that after decoding the previous data, it can immediately decode the next data, and let The selection unit 156 continuously selects the output of the decoder 154 as the output signal OS1 to prevent the output signal OS1 from generating an erroneous decoding signal.

Through the description of the above embodiments, a receiver power saving method can be summarized. FIG. 3 is a flowchart of a power saving method of a receiver according to an embodiment of the present invention. The receiver of this embodiment may have a decoder, such as a Viterbi decoder, without limiting its scope. Please refer to FIG. 3 , firstly, in step S301 , a received signal is received, that is, the receiver receives the received signal output by the remote device.

Afterwards, in step S303, it is detected whether the received signal is in an idle state to control the decoder to operate. When it is detected that the received signal is in an idle state, proceed to step S305 to disable the control signal so as to control the decoder to stop operating. Afterwards, when the decoder stops working, the control unit in the receiver disables the second control signal so that the selection unit does not select the output of the decoder as the output signal of the receiver.

On the other hand, when it is detected that the state of the received signal is not the idle state (that is, the data transmission state), proceed to step S307 to enable the control signal to control the decoder to decode the received signal. Afterwards, when the decoder decodes the received signal, the control unit in the receiver will enable the second control signal so that the selection unit can select the output of the decoder as the output signal of the receiver. In this way, the The receiver of the embodiment can effectively reduce power consumption.

To sum up, in the present invention, the control unit in the receiver detects the state of the split signal (ie, the state of the received signal), and generates a control signal correspondingly. That is to say, when the splitting signal (receiving signal) is in an idle state, the control unit disables the above-mentioned control signal; when the splitting signal (receiving signal) is in a data transmission state, the control unit enables the above-mentioned control signal. After that, the decoder decides whether to decode the received signal according to the state of the control signal. That is to say, when the control signal is disabled, the decoder stops decoding the received signal, that is, the decoder is in a stopped state, and the control unit will control the selection unit to select the delayed split signal as the output signal of the receiver ; When the control signal is enabled, the decoder decodes the received signal, that is, the decoder is in the working state, and the control unit controls the selection unit to select the output of the decoder as the output signal of the receiver. In this way, the present invention can effectively reduce the power consumption of the receiver.

Although the present invention has been disclosed above with the embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection should be defined by the appended claims.

Claims (5)

1. a receiver is applicable to the reception signal that the receiving remote device is transmitted, and this receiver comprises:

Analog-digital converter carried out the analog digital conversion in order to should receive signal, to produce digital signal;

Equalizer is coupled to this analog-digital converter, in order to adjusting this digital signal, and produces equalizing signal;

Sheer is coupled to this equalizer, in order to reception and this equalizing signal of cutting, and produces the cutting signal;

Delay cell is coupled to this sheer, in order to postpone this cutting signal;

Decoder is coupled to this equalizer, in order to determine whether this equalizing signal is decoded according to control signal;

Selected cell is coupled to this sheer and this decoder, in order to according to second control signal, and select this cutting signal that is postponed of output and this decoder output one of them as exporting signal; And

Control unit; Couple this sheer and this selected cell; In order to judging that according to the state of this cutting signal and this output signal the state that receives signal is idle state or data transmission state, with corresponding decision whether this control signal of activation and this second control signal.

2. receiver according to claim 1; Wherein when this control unit detects this cutting signal and has a crossfire character original position of data in this reception signal; This control signal of activation then; And have a crossfire character end position of data in this reception signal and do not detect this cutting signal before and after the Preset Time when having a crossfire character original position of data in this reception signal when this control unit detects this output signal, this control signal of forbidden energy then.

3. receiver according to claim 1; Wherein when this control unit detects this cutting signal and has a crossfire character original position of data in this reception signal; At interval behind the Preset Time; This second control signal of activation; And have a crossfire character end position of data in this reception signal and before and after this Preset Time, do not detect this cutting signal when having a crossfire character original position of data in this reception signal when this control unit detects this output signal, this control signal of forbidden energy then.

4. receiver according to claim 1, wherein this decoder is a Viterbi decoder.

5. R-T unit with receiver as claimed in claim 1.

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