KR20020001006A - A control circuit for transmitting packet data - Google Patents

Abstract

PURPOSE: A circuit for controlling transmission of packet data is provided to transmit signals of a high level channel in the first place by detecting a storage level of data stored in FIFOs of each channel. CONSTITUTION: A level detection portion(60) receives data transmission admission signals from a receiving side and level signals of packet data stored in FIFOs of each channel of a transmitting side and outputs channel segment signals of each level and level state signals. A channel selection portion(70) outputs a channel number of high priority and channel enable signals by processing the channel segment signals of each level and the level state signals. A multiplexing portion(35) outputs packet data of the channel number received from the channel selection portion(70). A UTOPIA(Universal Test and Operation Physical Interface for ATM) portion(45) outputs a transmission admission signal of the data of the channel number and a UTOPIA packet data transmission start signal. A multitude of AND gates(55) perform a logical AND operation for the channel enable signal, the transmission admission signal, and the UTOPIA packet data transmission start signal.

Description

Packet data transmission control circuit {A CONTROL CIRCUIT FOR TRANSMITTING PACKET DATA}

The present invention relates to a packet data communication system for transmitting and receiving packet data. In particular, when traffic of a specific channel increases, that is, the amount of data to be transmitted for each channel is detected, the priority is determined, and the priority is increased. The present invention relates to a control circuit of a utopia packet data transmission channel in which traffic is transmitted starting from a high channel data.

A system for transmitting packet data uses a common communication line to transmit transmission data and received data separately or selectively, so that when one device of the same system is to transmit data, it is common to other equipment. Do not use telecommunication lines or buses.

In the packet data system using a common communication line as described above, the data transmission order of each connected equipment is determined, and the data is transmitted according to the above order in a round robin manner, and asynchronous in order to transmit data at high speed. Utopia (Utopia: Universal Operation Physical Interface for ATM) method, which is a transmission mode (ATM), adopts a packet data to be transmitted to the FIFO until the channel to be transmitted is selected by the round robin channel selection. Save it.

In the round robin packet data transmission system as described above, when a traffic congestion phenomenon occurs in which channel data increases, the FIFO must be increased.

Hereinafter, a round robin utopia packet data transmission circuit according to the prior art will be described with reference to the accompanying drawings.

1 is a functional block diagram of a round robin utopia packet data transmission circuit according to the prior art.

Referring to FIG. 1, the conventional round-robin utopia packet data transmission circuit includes a channel selector 10 for selecting a device or a channel to receive utopia packet data in a round robin manner;

When there is data to be transmitted, a high signal is received from a data line allocated for each channel, a data empty, and a signal line TCLAV applied from a plurality of packet data receiving devices, respectively. If it is possible to receive a high signal, and at the same time, when receiving a control signal that the corresponding channel is selected from the channel selector 10, a channel check outputting a channel enable (channel_enb) signal Section 20,

When the packet data to be transmitted for each channel is received from the equipment for transmitting the packet data and the signal of the channel selected by the round robin method is received from the channel selector 10, the data of the selected channel is received. A multiplexer 30 for outputting to a data receiving side;

The channel select signal is received from the channel selector 10, and the transmittable signal TXENB and the data transmission start signal TXSOC of the corresponding channel are received by the channel enable signal received from the channel checker 20. ) Is composed of a utopia interface unit 40 for outputting to the packet data receiving side.

Hereinafter, a round robin utopia packet data transmission circuit or apparatus according to the related art having the above-described configuration will be described in detail with reference to FIG.

In a transmission device to transmit packet data, when there is packet data to be transmitted, a channel number signal indicating a device to receive the transmitted packet data is generated by the channel selection unit 10, and the generated channel number signal Is applied to the channel checker 20, the multiplexer 30 and the utopia interface 40.

The multiplexer 30 applies the data signal Data applied to the selected channel as transmission data TXDATA to a bus commonly used.

In order for the transmission data TXDATA applied to the common bus as described above to be received at the transmission destination, the channel confirmation unit 20 applies a signal TCLAV to allow packet data transmission from all the receiving devices. In response to the data generation unit not shown in detail in the drawing, a signal (Data Empty) for checking whether there is data to be transmitted or not for each channel is received, and the channel signal received from the channel selection unit 10 is processed. That is, when a channel is selected and the receiving device of the selected channel outputs a TCLAV signal for allowing packet data transmission in a high state, and at the same time a Data Empty signal indicating that there is data to be transmitted in the corresponding channel is enabled, the channel is enabled. A (channel_enb) signal is output to the utopia interface unit 40.

The utopian interface unit 40 receives a TXENB signal for allowing data transmission of the corresponding channel and a TXSOC signal for starting data transmission of the corresponding channel by a channel received from the channel selection unit 10. To transmit.

When the utopia interface unit 40 does not receive the channel_enb signal from the channel checking unit 20, since the receiving device of the channel is not ready to receive data, it does not receive the TCLAV signal. Alternatively, since there is no data to be transmitted to the corresponding channel, the Data Empty signal is not received, and the TXENB signal and the TXSOC signal of the corresponding channel are disabled, and the channel selector 10 has an internal counter value. By increasing the value, it is checked whether the TCLAV signal and the Data Empty signal are applied high by the round-robin method from the next channel.

On the receiving side of the channel connected to the common bus for packet data transmission, when the TXENB signal and the TXSOC signal are simultaneously received from the utopia interface unit 40, the transmission data TXDATA output from the multiplexer 30 is received. Done.

However, in the above-described conventional round-robin utopia packet data transmission circuit, there are 20 channels, and in the process of transmitting data according to the round-robin method, channel 4 receives traffic to channel 1. Increasingly, when data to be congested is congested, channels 5 to 20 are sequentially selected by a round-robin method, and after each data is transmitted, channel 1 is selected, so that data to be transmitted is first in first out. There was a problem to be stored using.

In particular, when the data to be transmitted to the channel is congested, the FIFO capacity for storing the data must be greatly increased, there is a problem that the manufacturing cost increases.

It is an object of the present invention to provide a utopia-type packet data transmission control circuit considering traffic, which detects the data storage level of a FIFO provided for each channel and transmits the signal of the channel with the largest level first. .

In order to achieve the above object, the present invention provides a round robin utopian packet data transmission system, comprising: a signal allowing data transmission from a receiving device and a level of data stored in a channel-specific packet of the transmitting device; A level detector receiving a signal and outputting a channel discrimination signal and a level status signal for each level; A channel selector configured to process the channel discrimination signal for each level received from the level detector and a level state signal to output a channel number and a channel enable signal having the highest priority; A multiplexer for outputting packet data of a channel number received from the channel selector; A utopian interface unit for outputting a signal allowing transmission of data of a channel number received from the channel selection unit, and a signal for allowing the channel to start data transmission; The channel enable signal received from the channel selector and the data transmission permission signal or data transfer start signal received from the utopia interface are received, and a plurality of AND gates are outputted and operated.

1 is a functional block diagram of a round-robin utopia packet data transmission circuit according to the prior art;

2 is a functional block diagram of a packet data transmission control circuit considering traffic according to the present invention;

3 is a detailed functional block diagram of a level detector according to the present invention.

** Explanation of symbols on the main parts of the drawing **

10: channel selector 20: channel checker

30,35: multiplexer 40,45: utopia interface

50,55,66,66N: AND gate 60: level detector

62,62N: Priority selector 64,64N: Permit detection

68,68N: channel detector 69,69N: priority level detector

70: channel selector

Hereinafter, a packet data transmission control circuit of a utopia method considering traffic according to the present invention will be described with reference to the accompanying drawings.

2 is a functional block diagram of a packet data transmission control circuit considering traffic of the present invention, and FIG. 3 is a detailed functional block diagram of a level detection unit of the present invention.

Referring to the accompanying drawings, according to the present invention, the Utopia packet data transmission control circuit considering the traffic, in a round robin (UTOPIA) packet data transmission system, transmits the packet data Priority selectors 62 and 62N for receiving the level of data stored in each channel FIFO from the corresponding channel FIFO and outputting a level signal of the selected channel; Permission detection units (64, 64N) receiving a signal (TCLAV) for allowing data transmission from a receiving device and outputting a signal (TCLAV) for allowing packet data transmission of a selected channel; And gates 66 and 66N which receive signals from the priority selector 62 and 62N and permission detectors 64 and 64N, respectively, and perform an AND operation and output the signal as a level state signal port_enb; When the output signal of the AND gates 66 and 66N is in a low state, the output signal is output as an up-counted channel number signal, that is, a channel classification signal for each level, and the priority selector ( 62, 62N and permission detectors 64, 64N, and when the AND gate 66, 66N output signal is high, the channel detector 68 maintains and outputs the signal of the channel number currently counted. A plurality of priority level detection units 69 and 69N each composed of 68N are configured to provide a signal TCLAV allowing data transmission from a receiving device and a FIFO for each channel of the transmitting device. A level detector 60 receiving a level signal Level_enb of the stored packet data and outputting a channel classification signal Level and a level status signal port_enb for each level;

The channel discrimination signal Level and the level status signal port_enb applied from the level detection unit 60 are processed, and the channel number and channel enable signal having the highest priority are channel_enb. A channel selector 70 for outputting

A TXDATA Multiplexer 35 for outputting packet data Data of a channel number received from the channel selector 70;

Utopia interface unit 45 for outputting a signal (TXENB) to allow the transmission of the data of the channel number received from the channel selector 70, and a signal (TXSOC) for the channel to start the transmission of utopian packet data. Wow,

The channel enable signal channel_enb received from the channel selector 70, the data transmission permission signal TXENB or the data transmission start signal TXSOC received from the utopia interface 45 are received, and AND) and a plurality of AND gates 55 for outputting.

Hereinafter, a utopia packet data transmission control circuit considering traffic according to the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

In the level detecting unit 60, a plurality of priority level detecting units 69 and 69N having the configuration as shown in FIG. 3 are configured for each level for transmitting UTOPIA system packet data, and the plurality of priority level detecting units ( 69, 69N) are applied for each of the N channels, and share the TCLAV signal allowing the transmission of packet data from the utopian system packet data receiving side.

In addition, the N-channel transmitting side classifies the data stored in the channel-specific (1-N) FIFO in units of levels, so that the signal of level 1 having the highest priority (Level_enb 1) is given priority. It is applied to the priority selection unit 62 of the priority level detection unit 69, and is sequentially input according to the priority, so that the signal of the lowest level M (Level_enb M) having the lowest priority is the priority of the priority level detection unit 69N. It is applied to the ranking selector 62N.

The priority level unit 69 for detecting the priority 1 is selected from the channel detector 68 and applied to the priority selector 62 and the permission detector 64, respectively.

When the amount of data recorded or recorded in the FIFO of one channel is high and is at level 1 (Level_enb 1), a high signal is applied from the first channel to the priority selector 62, but not at level 1. Low state signal is applied.

In addition, one channel of the permission detection unit 64 also receives a signal in a high state when the receiving channel 1 equipment can receive the packet data, and when the receiving channel 1 channel equipment cannot receive the packet data. Receives a low signal.

In the same way as above. The priority selector 62 and the permission detector 64 receive the corresponding signals from one channel to the N channel.

The channel detector 68 of the priority level detector 69 assigns one channel to each of the priority selector 62 and the permission detector 64 so as to apply the state signal of one channel to the AND gate 66. Output each to

The AND gate 66 outputs a one-level state signal port_enb # 1 when all signals input to both inputs are high, and at the same time, a signal having a high state to the channel detector 68. Therefore, the channel detector 68 maintains the current one channel and outputs a signal level # 1 [1] indicating one channel.

However, in one embodiment, when there is no signal having the highest priority in one channel, the channel detector 68 receives a low state signal, counts the channel upward, selects two channels, and selects the priority. The rank selection unit 62 and the permission detection unit 64 are applied.

When there is a signal having the highest priority in the two channels, the priority level unit 69 outputs a 'port_enb # 1' signal by the AND gate 66 and at the same time, two channels by the channel detector. The signal (Level # 1 [2]) indicating that the signal having the highest priority is outputted.

As another example, the priority level unit 69 outputs a port_enb # 1 signal and a signal of Level # 1 [3] when there is packet data with priority 1 in the FIFO of three channels. .

In the same manner as described above, the first to N channels are repeated until packet data of priority 1 is detected.

The priority level section 69 which detects packet data of priority 2 shown by dots in Fig. 3 outputs the port_enb # 2 signal and the signal of Level # 2 [1-N] by repeating the above method. do.

The priority level section 69N which detects the 'M' signal having the lowest priority repeats the same method as described above, and outputs the detected channel signal as the port_enb #M and Level #M [1-N] signals. Done.

A level status signal 'port_enb # 1 to port_enb #M' signal and a detected channel signal 'Level # 1 [1-N] to Level #M [1-N]' signals for each level are applied from the level detector 60. The receiving channel selector 70 analyzes the received signal and outputs the channel number of the signal having the highest priority in the current state to the multiplexer 35 and the utopia interface 45, respectively. At the same time, a channel enable signal (channel_enb) is output.

The multiplexer 35 outputs the Utopia packet data Data signal of the applied channel as an output signal TXDATA.

The utopia interface unit 45 outputs a data transmission permission signal TXENB and a data transmission start signal TXSOC of the authorized channels 1-N to correspond to a corresponding channel among the end gates 55. Are applied to the AND gates 55 of each.

The AND gate 55 simultaneously receives a channel enable signal channel_enb signal from the channel selector 70 to output an output signal in a high state to the equipment of the corresponding channel on the packet data receiving side. .

The channel equipment on the receiving side that receives the TXENB signal and the TXSOC signal in the high state from the AND gate 55 and receives the utopia packet data from the multiplexer 35 has the highest priority in the current state. High data is authorized.

More specifically, in the present state, if the packet data signal of priority # 1 has the highest priority, the signal is output, and if the packet data signal of priority # 5 is currently the highest priority, the signal is Is the output.

While the signal is output, the level detector 60 and the channel selector 70 search for the signals of the remaining channels in the same manner as described above, and again, the utopia of the channel with the highest priority in the current state. Since the packet data is output to the corresponding channel, the data of the same channel may be output again at the next clock, and if the priority is detected equally in two or more channels, the round robin method is used. Utopia packet data of the selected channel is output.

Accordingly, the present invention having the above-described configuration can detect the amount or level of data contained in the FIFO, even in a traffic congestion situation in which the number of channels increases and the transmitted data increases in a system for transmitting utopia packet data. Since the data is transmitted by the priority set higher, the data can be transmitted smoothly and the size of the FIFO can be used small.

The present invention as described above can reduce the FIFO size of each channel for transmitting utopia packet data, thereby reducing the cost of the system.

In addition, since data of a channel in which traffic is congested is transmitted first, there is an industrial and industrial use effect that the loss of transmitted data does not occur and the reliability of the system is improved.

Claims (2)

In the packet data transmission system, A level detector which receives a signal allowing data transmission from a receiving device, a level signal of data stored in a channel-specific packet of the transmitting device, and outputs a channel classification signal and a level status signal for each level; A channel selector for processing a channel discrimination signal for each level received from the level detector and a level state signal to output a channel number and a channel enable signal having the highest priority; A multiplexer for outputting packet data of a channel number received from the channel selector; A utopia interface unit for outputting a signal allowing transmission of data of a channel number received from the channel selection unit, a signal for allowing the channel to start data transmission; And a channel enable signal received from the channel selector, and a plurality of AND gates receiving and calculating and outputting a data transmission permission signal or a data transmission start signal received from the utopia interface. Packet data transmission control circuit, According to claim 1, The level detecting unit receives a data level signal of the signal for each channel, and outputs a level signal of the selected channel; A permission detector which receives a signal allowing data transmission from a receiving device and outputs a data transmission permission signal of a selected channel; An AND gate receiving signals from the priority selector and the permission detector, and performing an AND operation to output a level state signal; If the output signal of the AND gate is in a low state, an up-counted channel number signal is output and applied to the priority selector and a permission detector. If the AND gate output signal is in a high state, the channel number is currently counted. A packet data transmission control circuit comprising a plurality of priority level detectors each having a channel detector for maintaining and outputting a signal of each level;