KR100379386B1 - UTOPIA interface and Method for transport data using the same - Google Patents

Abstract

TECHNICAL FIELD The present invention relates to an asynchronous transmission mode (ATM) system, and more particularly, to a utopia interface and a data transmission method using the same, which are suitable for efficiently transferring data between an ATM layer device and a physical layer device. The utopia interface according to the present invention is an asynchronous transmission mode system including an ATM layer device and a physical layer device for transmitting / receiving cell data with the ATM layer device, wherein between the ATM layer device and the physical layer device. ATM layer apparatus comprising a first-in first-out for temporarily storing transmitted / received cell data, and a utopia controller 301 for controlling the transmission rate of the cell data by controlling the ATM layer device, the physical layer device, and the first-in first-out device. Data can be efficiently transmitted / received between system and physical layer device according to system requirements.

Description

Utopia interface and method for transport data using the same

TECHNICAL FIELD The present invention relates to an asynchronous transmission mode (ATM) system, and more particularly, to a utopia interface and a data transmission method using the same, which are suitable for efficiently transferring data between an ATM layer device and a physical layer device.

One of the ATM standard interfaces, the UTOPIA (Universal Test Operations PHY Interface for ATM) is an interface for data transmission between the physical layer (PHY) and the ATM layer. According to this utopia interface, a first-in first-out (FIFO) is provided to buffer the data transfer rate between the ATM layer device and the physical layer device.

1 and 2 are block diagrams illustrating a first-in first-out (FIFO) provided in a conventional utopia interface.

The first-in first-out (FIFO) is currently proposed to have a structure of 4: 1 mux or 1: 4 demux. Each first-in, first-out (FIFO) has a capacity of 128 bytes, so up to two standard cells (53 to 64 bytes) can be stored, and the interface can select either 'Utopia Rx' or 'Utopia Tx'. . This 1: 4 or 4: 1 structure is suitable for receiving four input channels of Utopia Level 1 Rate of 155Mbps or less and transmitting them to one Utopia Level 2 Rate output channel of 622Mbps or vice versa. Each FIFO can store up to two in the standard cell (53 bytes), and the choice of four FIFOs is built into the built-in round robin sequencer. Is controlled by At this time, the size of the cell can be adjusted from 8 bytes to 128 bytes, and only the cell-level handshake is possible between the ATM layer device and the physical layer device.

First, a 4: 1 mux first-in, first-out selector will be described with reference to FIG.

As shown in Fig. 1, a 4: 1 mux first-in, first-out is composed of four first-in first-out (FIFOs) 100-103 having a capacity of 128 bytes. Each first-in, first-out (FIFO) 100-103 uses an 9-bit data bus (including parity bits) and standard Utopia control signals to provide ATM devices (ATM layer devices and physical layer devices). Can be used in conjunction with At this time, only cell-level handshake is used as a data flow control method with an ATM device connected through a utopia interface.

Each data input to the four first-in first-out (FIFO) 100-103 is sequentially controlled by the round robin sequence generator 104, and at the output stage is an 18-bit data bus or two with utopia control signals. By selecting a 9-bit data bus, each can have an interface of utopia level 1 or utopia level 2. At this output, the flow control scheme with the connected ATM device only uses cell-level handshake.

Next, a 1: 4 demux first-in, first-out selector will be described with reference to FIG. 2.

As shown in FIG. 2, the input terminal of the demux 200 is composed of an 18-bit data bus and utopia control signals, and can be used in connection with an ATM device having an interface of a standard utopia level 1 or utopia level 2. At this time, only cell-level handshake is used as a data flow control method with an ATM device connected through a utopia interface. The data input to the demux 200 is demuxed to a port selected from four first in, first out (FIFO) through the internal routing and output.

This 1: 4 demux first-in, first-out selector has a 128-byte capacity and consists of a 9-bit data bus (including parity bits) and utopia control signals to provide a utopia level 1 interface. Can be used in connection with ATM devices. In the case of the output stage, the flow control scheme with the ATM layer apparatus connected only uses a cell-level handshake.

The 4: 1 mux first-in-first-out and the 1: 4 demux first-in first-out described above can be used internally by selecting 'UTOPIA RX mode' and 'UTOPIA TX' mode.

However, in such a conventional utopia interface, the mux / demux first-in-first-out (FIFO) does not function as a 1: 1 speed buffer between the ATM layer unit and the physical layer unit, and the capacity of each first-in-first-out unit is 128 bytes. There is a limitation that it cannot support further data transmission, and also does not support Octet-level handshake, which is one of the data negotiation methods defined in the standard utopia interface.

Accordingly, an object of the present invention has been made in view of the above-mentioned problems of the prior art, to provide a utopia interface and a data transmission method using the same that can efficiently perform data transmission between an ATM layer device and a physical layer device. It is for.

According to a configuration feature of the present invention for achieving the above object, in the asynchronous transmission mode system comprising a Utopia interface comprising an ATM layer device, and a physical layer device for transmitting and receiving cell data with the ATM layer device. A first-in, first-out for temporarily storing cell data transmitted / received between the ATM layer device and the physical layer device, and a utopia for controlling the transmission speed of the cell data by controlling the ATM layer device, the physical layer device, and the first-in first-out device. It consists of a controller 301.

Advantageously, the utopia controller controls the amount of cell data transmitted through the dual mode first-in, first-out by controlling the utopia signal provided by the asynchronous transmission mode utopia interface of the asynchronous transmission mode system.

According to a method feature of the present invention for achieving the above object, the data transmission method using a utopia interface is a data transmission method between the ATM layer device and the physical layer device of the asynchronous transmission mode system, the ATM layer device is a utopia controller A first step of notifying that data is to be sent by the first step; the second step of the utopia controller checking the state of the first-in, first-out; A third step of notifying that it is possible; a fourth step of transmitting the data to the first-in, first out of the ATM layer device; Notifying the transmission of data to the physical layer device; And a seventh step of notifying that the data can be received to the utopia controller, and a seventh step of transmitting the data stored in the first-in, first-out to the physical layer device.

1 to 2 is a block diagram showing a first-in, first-out (FIFO) provided in the conventional utopia interface.

3 is a block diagram illustrating a utopia interface according to a first embodiment of the present invention.

4 is a block diagram illustrating a utopia interface according to a second embodiment of the present invention.

5 is a signal flow diagram in the utopia transmission mode in the utopia interface according to the present invention.

6 is a signal flow diagram in the utopia reception mode in the utopia interface according to the present invention.

7 is an operation timing diagram in the utopia transmission mode shown in FIG. 5;

8 is an operation timing diagram in the utopia reception mode shown in FIG. 6;

* Description of the symbols for the main parts of the drawings *

300: ATM layer device 301: utopia controller

302: first in, first out (FIFO) 303: physical layer device

Hereinafter, a configuration and an operation according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

The present invention proposes a utopia interface capable of efficiently transferring data between an ATM layer device and a physical layer device, and a data transmission method using the same.

To this end, in the present invention, the utopia interface adds a UTOPIA controller for controlling a first-in, first-out (FIFO), which plays a role of speed buffering when transmitting and receiving data between an ATM layer device having an ATM utopia interface and a physical layer device. It consists of. To this end, the utopia controller has a function of controlling utopia signals so that the first-in, first-out selector can be inserted freely.

The utopia controller may be implemented separately from the first-in first-out (FIFO) or in combination with one device.

In particular, in the utopia interface according to the present invention, one of a cell-level handshake and an octet-level handshake can be selectively used as a flow control method between an ATM layer device and a physical layer device. The data transfer rate can be controlled by adjusting the capacity of the selector.

3 is a block diagram illustrating a utopia interface according to a first embodiment of the present invention, and FIG. 4 is a block diagram illustrating a utopia interface according to a second embodiment of the present invention.

Referring to FIG. 3, the utopia interface according to the first embodiment of the present invention includes an ATM layer device 300, a physical layer device 303, and data between the ATM layer device 300 and the physical layer device 303. First-in, first-out (FIFO) 302 that acts as a buffer of the transmission rate, the ATM layer device 300 to transmit and receive data between the ATM layer device 300 and the physical layer device 303, It consists of a utopia controller 301 that controls the physical layer device 303 and the first in, first out (FIFO) 302.

Referring to FIG. 4, the utopia interface according to the second embodiment of the present invention has a structure in which the first-in first-out (FIFO) 302 and the utopia controller 301 described in the first embodiment are implemented as one device. .

Accordingly, the utopia interface according to the second embodiment provides data for transmitting / receiving data between the ATM layer device 400, the physical layer device 402, and the ATM layer device 400 and the physical layer device 402. It consists of a first-in, first-out / utopia controller 401 that adjusts the transmission speed.

Thus, the operation of the utopia interface shown in Figs. 3 to 4 will be described with reference to Figs.

The utopia interface according to the present invention operates in a utopia transmission mode in which data flows from an ATM layer device to a physical layer device, and in a utopia reception mode in which data flows from a physical layer device to an ATM layer device.

5 is a signal flowchart in a utopia transmission mode in the utopia interface according to the present invention, and FIG. 6 is a signal flowchart in a utopia reception mode in the utopia interface in accordance with the present invention.

The signal flow diagrams in the utopia transmission mode and the utopia reception mode shown in FIGS. 5 to 6 correspond to the utopia interface shown in FIGS. 3 to 4. In addition, the first-in first-out (FIFO) according to the present invention is a dual sync first-in first-out (FIFO) is operated as a first-in first-out A (FIFO A) in the utopia transmission mode, the first-in first-out B (in the utopia reception mode) It works as FIFO B).

First, the operation of the utopia transmission mode of the utopia interface will be described with reference to FIG. 5.

First, a clock signal ATM_TxClk is generated from the ATM layer device 500 to the physical layer device 503 (S500). This clock signal ATM_TxClk is a write clock FIFO_WCLKA from the ATM layer apparatus 500 to the FIFO A of the utopia controller 501 and the dual synchronous first-in first-out (FIFO) 502. (S501).

Subsequently, when data to be transmitted is generated, the ATM layer apparatus 500 generates a TxEnb * signal to the utopia controller 501 (S502). This TxEnb * signal is normally kept high.

Then, the utopia controller 501 checks whether the first-in, first-out A (FIFO A) is saturated (S503), and if not, generates a TxCLAV signal indicating that data can be received by the ATM layer apparatus 500 ( S504) The WENA * signal Low is generated by the first-in first-out A (FIFO A) (S505). Here, the first-in, first-out A (FIFO A) generates a PAFA * signal high when the utopia controller 501 checks whether the saturation state is notified. At this time, the cell-level hand control of data flow control between the ATM layer apparatus 500 and the physical layer apparatus 503 is set by the user in PAPA * signal, the threshold value at which the saturation flag is set in cell size or byte unit. It can be adjusted to perform either a shake or an octet-level handshake.

Upon receipt of the TxCLAV signal from the utopia controller 501, the ATM layer apparatus 500 generates a TxSOC signal to the utopia controller 501 and the first-in first-out A (FIFO A) 502 to inform the start of cell transmission. The data is transmitted (S506, S507).

According to this process, the cell data is stored in the first-in first-out A (FIFO A) 501, and then the PAEA * signal (High) indicating that it is not empty from the first-in first-out A (FIFO A) 501. Receiving the Utopia controller 501 generates a TxENB * signal to the physical layer device 503 to inform that there is cell data to be transmitted (S510 and S511). The FIFO_RCLKA clock signal used at this time is obtained by inverting FIFO_WCLKA, and the FIFO_RCLKA clock signal and the PHY_TxCLK signal are used in synchronization (S508 and S509).

Thereafter, the physical layer device 503 that receives the TxENB * signal from the utopia controller 501 generates a TxCLAV signal to the utopia controller 501 indicating that the cell data can be received (S512).

Then, after receiving the TxCLAV signal, the utopia controller 501 generates a RENA * signal to the first-in first-out A (FIFO A) 502 so that the physical layer device 503 receives the cell data from the first-in first-out A (FIFO A). To receive (S513, S514, S515). At this time, the FIFO A 502 transmits a TxSOC signal to the utopia controller 501 and the physical layer device 503 indicating that the cell data is transmitted to the physical layer device 503.

The operation of the utopia reception mode of the utopia interface will now be described with reference to FIG. 6.

First, a clock signal ATM_RxClk is generated from the ATM layer device 600 to the physical layer device 603 (S600). This clock signal ATM_RxClk is a write clock FIFO_WCLKA for the utofo controller 601 and the FIFO B of the dual synchronous first-in first-out (FIFO) 602 in the ATM layer device 600. (S601).

Subsequently, when the data to be transmitted is generated, the physical layer device 603 generates an RxCLAV signal to the utopia controller 601 (S602). This RxCLAV signal maintains a low value normally.

Then, the utopia controller 601 checks whether the first-in, first-out B (FIFO B) is saturated (S603), and if it is not saturated, generates a RxENB * signal indicating that the physical layer device 603 can receive data. In step S605, the first-in, first-out selector B (FIFO B) generates a WENB * signal (S604). Here, the first-in, first-out B (FIFO B) generates a PAFB * signal high when the utopia controller 601 checks whether or not the saturation state, indicating that the FIFO B is not saturated. At this time, in the PAFB * signal, the user sets the threshold at which the saturation flag is set in cell size or byte unit to control data flow control between the ATM layer device 600 and the physical layer device 603. It can be adjusted to perform either a shake or an octet-level handshake.

Upon receiving the RxENB * signal from the utopia controller 601, the physical layer device 603 generates an RxSOC signal to the utopia controller 601 and the first-in first-out B (FIFO B) 602 to inform the start of cell transmission. Cell data is transmitted (S606, S607).

The FIFO_RCLKB clock signal used at this time is obtained by inverting FIFO_WCLKB, and the FIFO_RCLKB clock signal and the PHY_RxCLK signal are used in synchronization (S608).

According to this process, the cell data is stored in the first-in first-out B (FIFO B) 601, and thereafter, a PAEB * signal (High) indicating that the first-in first-out B (FIFO B) 601 is not empty. Receiving the Utopia controller 601 generates an RxCLAV signal to the ATM layer apparatus 600 to inform that there is cell data to be transmitted (S609 and S610).

Thereafter, the ATM layer apparatus 600 receiving the RxCLAV signal from the utopia controller 601 generates an RxENB * signal to the utopia controller 601 indicating that cell data can be received (S611).

Then, the utopia controller 601 receives the RxENB * signal, and then generates a FIFO_RENB * signal to the first-in, first-out selector B (FIFO B) 602 so that the ATM layer device 600 receives a cell from the first-in first-out selector B (FIFO B). Receive data (S612, S613, S614). At this time, the FIFO B 602 transmits an RxSOC signal to the utopia controller 601 and the ATM layer device 600 indicating that the cell data is transmitted to the ATM layer device 600.

FIG. 7 is an operation timing diagram in the utopia transmission mode shown in FIG. 5, and FIG. 8 is an operation timing diagram in the utopia reception mode shown in FIG.

According to the utopia interface and the data transmission method using the same according to the present invention as described above, by further comprising a utopia controller for controlling the interface between the first-in, first-out provided in the utopia interface according to the system requirements By adjusting the data transmission speed, data can be efficiently transmitted / received between ATM layer devices and physical layer devices according to system requirements.

In addition, according to the utopia interface according to the present invention, any one of a cell-level handshake and an octet-level handshake can be selectively used according to a system environment as a data flow control method between an ATM layer device and a physical layer device, thereby increasing system efficiency. It is effective to let.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the examples, but should be defined by the claims.

Claims (3)

In the asynchronous transmission mode system comprising an ATM layer device, and a physical layer device for transmitting and receiving cell data with the ATM layer device, A first-in first-out unit for temporarily storing cell data transmitted / received between the ATM layer device and the physical layer device; And a utopia controller (301) for controlling the transmission rate of the cell data by controlling the ATM layer device, the physical layer device, and the first-in, first-out. The method of claim 1, wherein the utopia controller, And controlling the amount of cell data transmitted through the dual mode first-in-first-out by controlling a utopia signal provided by the asynchronous transmission mode utopia interface of the asynchronous transmission mode system. In the data transmission method between the ATM layer device and the physical layer device of the asynchronous transmission mode system, A first step of informing the ATM layer device to send data to a utopia controller; A second step of checking, by the utopia controller, the state of the first-in, first-out, A third step of informing the ATM layer apparatus that the utopia controller is capable of receiving data when the first-in first-out selector is not saturated; A fourth step in which the ATM layer device transmits data to the first-in, first-out, A fifth step in which the utopia controller notifies the physical layer device of transmission of data when a signal is received at the first-in, first-out selector indicating that it is saturated; A sixth step of informing that the physical layer device can receive data from the utopia controller; And a seventh step of transmitting, by the utopia controller, the data stored in the first-in, first-out to the physical layer device.