KR100918389B1 - Control Apparatus and Method based Software - Google Patents

Abstract

A control device and method for managing and controlling a target device in real time by a program is disclosed. The control device includes a control unit for controlling the target device according to the stored control program and the control parameters, and an internal circuit of the target device for outputting a two-wire serial type external signal including a command for modifying a control program from an external host or adjusting a control parameter. Conversion unit for setting or checking the status value of the input / output pins connecting each of them, and setting or checking the status value of the input / output pins by directly accessing the internal circuit of the target device according to a command included in the converted internal signal. By including an internal interface unit, it is possible to change the control program and control parameters built in the target device in the external host to obtain the effect of facilitating the management and control of the target device.

JTAG, DDMC

Description

Control Apparatus and Method by Program {Control Apparatus and Method based Software}

The present invention relates to a control apparatus and method by a program, and more particularly, it is possible to control and manage in real time by a program using a JTAG interface, and to easily develop and manage an embedded program through communication with an external host. It relates to a control device and a method that can be.

The present invention is derived from a study conducted as part of the IT new growth engine core technology development project of the Ministry of Information and Communication and the Ministry of Information and Communication Research and Development. [Task Management No .: 2005-S-401-02, High-speed Optical Subscriber Network Technology].

US Patent Registration No. 6941077B2 discloses a structure of a conventional control device capable of communicating with each functional block inside a controller from an external host.

The disclosed control device maintains a communication channel with an external host using a two-wire serial communication interface. All components in the controller are configured to be mapped to a memory map, and functional blocks of the controller, such as a memory, a lookup table, and a flag store, are each connected in a two-wire serial manner. In other words, it is implemented so that each internal function block can be accessed from external host through 2-wire serial method.

The two-wire serial communication method transmits serially one bit at a time through two lines consisting of one signal line for transmitting a data signal and one signal reference line for transmitting a clock pulse as a reference for the data signal. It has the advantage of being suitable and low error rate, but has the disadvantage of being very slow.

As such, the two-wire serial communication method is very slow and the two-wire bidirectional communication method has limited access range and performance. Therefore, in case of connecting the memory inside the control device and each functional block by the two-wire serial communication method like the proposed control device, the microcontroller (MCU) stores the program in the memory and flexibly operates according to the stored program. The original function cannot be fully implemented.

In addition, when using the two-wire serial communication interface, such as the control device disclosed above, the external host is only accessible to the control device consisting of memory and other functional blocks that can use the two-wire serial communication method. Therefore, in the case of using a communication method different from the two-wire serial communication in the connection between the functional blocks inside the control device, communication with the external host cannot be made directly.

In order to guarantee the complete operation of the target device and to monitor the failure, it is necessary to monitor and control the target device at high speed from an external host and to change the control parameters inside the target device at any time. This requires a controller that fully implements the MCU's ability to flexibly control the target device to operate according to the program.

However, especially in the case of the optical transmission and reception apparatus, there are significant limitations in the external interface of the control apparatus due to the limitation of the standard. Optical transmitter and receiver have mostly standardized external interface and packaging. To date, Small Form Factor Pluggable (SFP) and Gigabit Interfcae Converter (GBIC) are the most commonly used, and these standards are the external interfaces that optical transmitter and receiver can have. Is limited to two-wire serial mode.

Therefore, MCUs supporting two-wire serial methods should be used. Such MCUs can only store and debug programs, and control and monitoring of peripheral circuits connected to the MCUs are difficult to implement.

After all, according to the standard of the optical transmission and reception device, a separate control device interface is required to implement a control device that is controlled and managed by a program. However, these interfaces are only used in the factory manufacturing process and must be removed when they are released into production. This is because the standard of the optical transceiver is not assigned a device for this interface part. In this case, there is a disadvantage that modification and change are difficult during operation after the program in the optical transceiver is released as a real product.

The technical problem to be solved by the present invention is to control and manage a target device based on a two-wire serial communication interface as a standard by a built-in control program, and to develop and manage a control program through communication with an external host. It is to provide a control device and method that can facilitate the.

In order to achieve the above technical problem, an embodiment of a control device according to the present invention includes a control unit for controlling a target device according to a control program and control parameters stored therein; Converts a 2-wire serial signal including a command to modify a control program from an external host or adjust a control parameter into an internal signal that sets or examines a state value of an input / output pin connecting the internal circuits of a target device, respectively. A conversion unit; It includes an internal interface for directly accessing the internal circuit according to the command included in the converted internal signal to set or examine the state value of the input and output pins.

In order to achieve the above technical problem, an embodiment of a control method according to the present invention comprises the steps of: controlling a target device according to a control program and control parameters stored therein; Receiving an external signal transmitted in a two-wire serial manner including instructions for modifying a control program or adjusting a control parameter from an external host; Converting the received external signal into an internal signal for setting or inspecting a state value of an input / output pin connecting the internal circuits of the target device, respectively; And directly accessing an internal circuit according to a command included in the converted internal signal to set or examine a state value of the input / output pin.

In order to achieve the above technical problem, there is provided a computer-readable recording medium having recorded thereon a program for executing the control method according to the present invention on a computer.

As described above, the present invention can flexibly monitor, control, and manage a target device according to a control program, and modify and change the control program as necessary.

In particular, in the case of the optical transmission / reception apparatus used in the optical communication network, all necessary functions are flexibly implemented in the current standard (SFF-8472) through the control program, and are monitored, managed and controlled in real time by an external host.

In the target device adopting the two-wire serial method as a standard, in the past, it was possible to modify and change various parameters inside the target device only at the time of factory manufacturing or at the sole test of the target device. You can modify and change all of the

In particular, all functions necessary for the optical transmission and reception device used in the optical communication network can be implemented in a single chip, and the external host can access all the functional blocks inside the optical transmission and reception device to facilitate monitoring, control and management.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which can be easily implemented by those skilled in the art. The same reference numerals are used to refer to the components even though they are on different drawings, and it is to be noted that components of the other drawings may be cited when the description of the drawings is necessary.

1 is a view showing a general configuration of an optical transmission and reception apparatus as an example of the embodiment of the present invention.

Referring to FIG. 1, the optical transmission and reception apparatus according to the present embodiment is largely composed of a reception circuit unit 120, a transmission circuit unit 130, and a control device 110.

The receiving circuit unit 120 is composed of a receiver optical subsystem 123 and a final amplifier 126 circuit. The ROSA 123 is composed of a photodiode and a pre-amplifier circuit to convert the received optical signal into an electrical signal. The final amplifier circuit 126 amplifies an electrical signal so that it can be connected to an external circuit through the RX + / RX- (17) signal, and also provides a Loss of Signal (LOS) or Signal Detect that can indicate the characteristics of the optical signal. Generate a digital signal.

The transmission circuit unit 130 includes a transmitter optical subsystem 133 and a laser driver 136. The transmitted signal receives an electrical signal from the external circuit through the TX + / TX- (12) signal line, and adjusts the bias current of the laser driver 136 to operate the laser diode in the TOSA.

At this time, the laser driver circuit needs to be adjusted at various stages of the optical transmission / reception apparatus for various parameters, and these adjustment values are stored in the controller 110.

The controller 110 performs functions for controlling, monitoring, and maintaining performance of the optical transceiver, and is connected to an external host through an SDA for delivering data and an SCL for delivering a clock.

The function performed by the control device should be performed from time to time when the optical transceiver is operated from time to time when the power is turned off, and the parameters storing the performance result must be updated at all times. In addition, when important standards of the optical transmitter and receiver are changed, it may occur that the entire parameter held by the controller is updated. Therefore, the control device needs to use a microcontroller (MCU) such as the 8051.

2 is a view showing the structure of a control device by a program according to an embodiment of the present invention.

2, as a preferred embodiment of the present invention, the control device includes a control unit 210, a conversion unit 220, and an internal interface unit 230.

The controller 210 controls the target device according to the stored control program and the control parameters.

The conversion unit 220 is connected to the external host and the internal interface 230, respectively, and receives an external signal of a 2-wire serial communication method including a command to modify the control program or adjust the control parameter from an external host. By converting the state value of the input / output pins connecting the internal circuits of the target device to the internal signal for setting or irradiating the state value, the internal interface unit 230 is transferred.

The two-wire serial communication method transmits serially one bit at a time through two lines including one signal line for transmitting a data signal and one signal reference line for transmitting a clock pulse as a reference of the data signal.

In order to modify the control program stored in the controller or to adjust the control parameters through the commands included in the external signal from the external host, and to access the functional blocks inside the target device, each of the internal circuits included in the target device must be connected. You should be able to set the status value of the I / O pin, that is, the level value of High (1) or Low (0), or to investigate the status value of the current I / O pin. Such a function is called a boundary scan function. The boundary scan is standardized by IEEE 1149.1 in its operation and configuration, and IEEE 1149.1 is generally called a joint test access group (JTAG).

The internal interface 230 receives the converted internal signal from the conversion unit 220 and directly accesses an internal circuit of the target device according to a command included in the internal signal to set or examine a state value of the input / output pin. That is, the external host transmits a command to the internal interface 230 through the internal signal converted by the converter 220 to test all circuits connected to the internal interface 230, and also to the controller 210. Test, change, and add a stored program.

The internal interface 230 may be implemented as a JTAG interface for this purpose, and in this case, the converter 220 converts an external signal of a two-wire serial method into an internal signal of a five-wire JTAG communication method.

Joint Test Access Group (JTAG) interface is an interface standardized by IEEE 1149.1 for testing the internal hardware of chips with complex circuitry. It drives or values all external pins of the connected device, regardless of the state of the processor (CPU). Provides the ability to read. In other words, since all the internal nodes of the chip cannot be identified, five pins that communicate to the outside, that is, TCK (Test Clock), TMS (Test Mode Select), TRST (Test Reset), TDI (Test Data In) and TDO (Test Data) Use only Out, and it is possible to check the internal circuit. Thus, five pins allow you to test memory, CPUs, and other circuitry inside the chip, and move the program to the memory inside the chip.

3 is a view showing the structure of an optical transmission and reception device including a control device according to an embodiment of the present invention.

Referring to FIG. 3, the optical transmission and reception apparatus according to the present embodiment is configured by adding the control apparatus illustrated in FIG. 2 to the optical transmission and reception apparatus illustrated in FIG. 1. Therefore, although omitted below, the above descriptions of the optical transmission and reception apparatus shown in FIG. 1 and the control apparatus shown in FIG. 2 also apply to the optical transmission and reception apparatus according to the present embodiment.

The optical transmission / reception apparatus according to the present embodiment includes a reception circuit unit 120, a transmission circuit unit 130, a serial-to-JTAG conversion unit 310, and a JTAG control unit 320.

The serial-to-JTAG converter 310 converts an external signal of a two-wire serial method into an internal signal of a five-wire JTAG communication method and transmits it to the JTAG controller 320.

The JTAG control unit 320 is a control unit 210 (see FIG. 2) and an internal interface unit 230 (see FIG. 2) integrally implemented as an optical transmitter / receiver control circuit using a JTAG interface.

The JTAG control unit 320 controls, manages, and monitors the optical transmitter / receiver according to a control program and control parameters stored therein. The JTAG control unit 320 also controls a command included in an internal signal converted by the serial-to-JTAG converter 310. Accordingly, the control program stored therein is modified or the stored control parameters, that is, adjustment values used in the laser driver 136 and other parameters inside the optical transceiver are adjusted. Such parameters include optical module temperature, reception sensitivity, transmission sensitivity, transmission bias current value, reception bias current value, and the like.

In the case of the optical transceiver, additional monitoring and control functions for performance monitoring, performance improvement, manufacturing management, maintenance and repair, optical signal correction, etc. of the optical transceiver are provided in addition to the optical signal transmission / reception function inherent to the development of the optical communication network. It became necessary. In order to perform this additional function, various control circuits have to be added in the optical transceiver. The JTAG control unit 320 performs a real-time monitoring and control functions using a software program by using the JTAG interface, and adds and changes the functions as necessary.

4 is a diagram illustrating the structure of a control apparatus of an optical transmitting and receiving apparatus using a JTAG interface according to a first embodiment of the present invention. The JTAG control unit 320 of FIG. 3 is shown in detail.

Referring to FIG. 4, the control unit according to the present embodiment includes a memory 420, a CPU 430, a DDMC logic circuit 440, and a JTAG interface circuit 450, and a peripheral circuit that performs other additional functions. 460) may be added.

The memory 420 stores a program for controlling the optical transmitter and receiver in advance.

The CPU 430 controls the optical transmitter / receiver by executing a program stored in the memory 420.

The DDMC logic circuit 440 stores control parameters such as optical module temperature, reception sensitivity, transmission sensitivity, transmission bias current value, reception bias current value, and the like, and uses the digital diagnostic monitoring control (Digital) defined in the SFF-8472 standard. Perform Diagnostic Monitoring Control (DDMC) function.

The DDMC function is an additional function for setting up, monitoring, and improving the optical transmitter and receiver, and includes a setting function, identification function, safety check and error detection, temperature compensation function, monitoring function, timer function, and the DDMI (Digital Diagnostic Monitoring Interface). for Optical Transceivers) and standardized (SFF-8472).

The CPU 430 and the memory 420 are connected in parallel with an address bus and a data bus, and the connection between the CPU 430 and the DDMC logic circuit 440 and the CPU 430 and the peripheral circuit 460 is the same. Is connected.

The JTAG interface circuit 450 may modify a control program stored in the memory 420 or control parameters stored in the DDMC 440 according to a command included in an internal signal converted by the serial-JTAG conversion unit 410, that is, a laser driver. Adjust the adjustment values used in 136 and other parameters inside the optical transceiver.

FIG. 5 is a diagram illustrating a structure of a control apparatus of an optical transceiver apparatus using a JTAG interface according to a second embodiment of the present invention. The serial-to-JTAG converter 310 of FIG. 3 and the JTAG controller 320 of FIG. It shows the control device implemented in a single chip in detail. Therefore, although omitted below, the above descriptions of the serial-to-JTAG conversion unit 310 shown in FIG. 3 and the JTAG control unit 320 shown in FIG. 4 also apply to the control device according to the present embodiment. do.

Referring to FIG. 5, the serial-to-JTAG interface circuit is an integrated implementation of the serial-to-JTAG converter 320 and a JTAG interface circuit, and converts an external signal of a two-wire serial method into an internal signal of a five-wire JTAG communication method. According to a command included in the converted internal signal, the control program stored in the memory 420 is modified or the control parameter stored in the DDMC 440, that is, the adjustment value used in the laser driver 136 and other optical transmission / reception apparatuses. Performs the function of adjusting the parameters.

5 is advantageous in implementing a control device with a single chip. In this case, the communication method inside the control device, that is, the connection between the memory 520, the CPU 530, the CPU 530, the DDMC 540, and the CPU 530, the peripheral circuit 560, is a JTAG method or an address and data bus. And so on.

6 is a diagram illustrating a flow of a control method by a program according to an embodiment of the present invention.

Referring to FIG. 6, the control method according to the present exemplary embodiment includes a step of time-series processing in the control apparatus illustrated in FIG. 2. Therefore, even if omitted above, the contents described above with respect to the control device shown in FIG. 2 are also applied to the control method according to the present embodiment.

First, the target device is controlled according to the stored control program and control parameters (S610).

In this process, an external signal transmitted in a two-wire serial method including a command to modify a control program or adjust a control parameter is received from an external host (S620).

In operation S630, the external signal received in step S620 is converted into an internal signal for setting or inspecting a state value of an input / output pin connecting the internal circuits of the target device.

After that, according to a command for modifying the control program included in the converted internal signal or adjusting the control parameter in step S630, the internal circuit of the target device is directly accessed and the state value of the input / output pins connecting the internal circuits are set or investigated. (S640).

The invention can also be embodied as computer readable code on a computer readable recording medium. Computer-readable recording media include all kinds of recording devices that store data that can be read by a computer system. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disks, optical data storage devices, and the like, which are also implemented in the form of carrier waves (for example, transmission over the Internet). Include. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. In addition, functional programs, codes, and code segments for implementing the present invention can be easily inferred by programmers in the art to which the present invention belongs.

Such a method and apparatus of the present invention has been described with reference to the embodiments shown in the drawings for clarity, but this is merely exemplary, and various modifications and equivalent other embodiments are possible to those skilled in the art. Will understand. Therefore, the true technical protection scope of the present invention will be defined by the appended claims.

1 is a view showing a general configuration of an optical transmission and reception apparatus as an example of the embodiment of the present invention.

2 is a view showing the structure of a control device by a program according to an embodiment of the present invention.

3 is a view showing the structure of an optical transmission and reception device including a control device according to an embodiment of the present invention.

4 is a diagram showing the structure of a control apparatus of an optical transmitting and receiving apparatus using a JTAG interface according to a first embodiment of the present invention.

5 is a diagram showing the structure of a control device of an optical transmission and reception device using a JTAG interface according to a second embodiment of the present invention.

6 is a diagram illustrating a flow of a control method by a program according to an embodiment of the present invention.

Claims (10)

A control unit controlling the target device according to the stored control program and the control parameters; 5 wires for setting or inspecting the state value of the input / output pins connecting the internal circuits of the target device to the 2-wire serial type external signal including a command for modifying the control program from an external host or adjusting the control parameters. Conversion unit for converting to internal signal of JTAG communication method and And an internal interface unit for directly accessing the internal circuit according to a command included in the converted internal signal and setting or inspecting a state value of the input / output pin. The method of claim 1, The target device is a control device, characterized in that the optical transmission and reception device. The method of claim 2, And the control program performs a digital diagnostic monitoring control function defined in the SFF-8472 standard. The method of claim 2, The control parameter may include at least one of an optical module temperature, a reception sensitivity, a transmission sensitivity, a transmission bias current value, and a reception bias current value. The method of claim 1, And the internal interface unit modifies a control program stored in a memory of the target device or adjusts parameters within the target device according to a command included in the internal signal. Controlling the target device according to the stored control program and the control parameters; Receiving an external signal transmitted in a two-wire serial manner including instructions for modifying the control program or adjusting the control parameters from an external host; Converting the received external signal into an internal signal of a 5-wire JTAG communication method for setting or inspecting a state value of an input / output pin connecting the internal circuits of the target device, respectively; And a control step of directly accessing the internal circuit according to the command included in the converted internal signal to set or examine a state value of the input / output pin. The method of claim 6, The target device is a control method, characterized in that the optical transmission and reception device. The method of claim 7, wherein The control program is a control method, characterized in that to perform a digital diagnostic monitoring control (Digital Diagnostic Monitoring Control) function defined in the SFF-8472 standard. The method of claim 7, wherein The control parameter comprises at least one of optical module temperature, reception sensitivity, transmission sensitivity, transmission bias current value, reception bias current value. The method of claim 6, The control method may further include modifying a control program stored in a memory of the target device or adjusting parameters in the target device according to a command included in the internal signal.

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