JP2013247412A - Communication device and method of controlling the same - Google Patents

Communication device and method of controlling the same Download PDF

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JP2013247412A
JP2013247412A JP2012117999A JP2012117999A JP2013247412A JP 2013247412 A JP2013247412 A JP 2013247412A JP 2012117999 A JP2012117999 A JP 2012117999A JP 2012117999 A JP2012117999 A JP 2012117999A JP 2013247412 A JP2013247412 A JP 2013247412A
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unit
system unit
phy
communication system
physical layer
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JP6004743B2 (en
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Tomokazu Yamaki
智和 八巻
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Canon Inc
キヤノン株式会社
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Abstract

The present invention is applicable to a communication system unit that cannot perform interrupt control, and realizes physical layer (PHY) monitoring control capable of preventing a decrease in throughput and data loss.
A communication apparatus includes a main system unit that performs application processing and a communication system unit that performs communication processing via a physical layer. The main system unit 110 detects a change in the state of the physical layer. When the change in the state of the physical layer is detected, the main system unit 110 instructs the communication system unit 120 regarding the physical layer monitoring control. The communication system unit 120 performs physical layer monitoring control based on the instruction.
[Selection] Figure 3

Description

  The present invention relates to PHY monitoring control in a communication apparatus.

  There are standards such as IEEE 802.3 and Ethernet (registered trademark) for connecting a network cable to a local area network (LAN) in order for a communication device to communicate. These standards specify communication modes such as 10 Mbps, 100 Mbps, and 1000 Mbps, and communication modes such as half duplex and full duplex. The communication speed and communication mode are set statically or using the auto negotiation function standardized by IEEE802.3u so that the communication conditions with the opposite communication device match.

  There is a possibility that the communication speed and communication mode may be changed in the own communication device or the opposite communication device during communication, and there is a possibility that the link state such as link up and link down will change due to the insertion / extraction of the network cable. In order to solve such problems, the physical layer (PHY) status such as communication speed, communication mode, and link status is monitored, and media access control (MAC) layer control (hereinafter referred to as MAC control) is performed as necessary. There is PHY monitoring control to be performed.

Some commercially available MAC / PHY devices include a register or memory that indicates the state of the PHY, and notify an interrupt when the state of the PHY changes. Therefore, when application processing, protocol processing, and PHY monitoring control are performed in one system, the following method is adopted for PHY monitoring control.
-Polling registers and memory indicating the PHY status to monitor the PHY status, and if there is a PHY status change, perform MAC control as necessary.
・ Receives an interrupt related to PHY status change from the MAC / PHY device, and performs MAC control as necessary by referring to a register or memory indicating the PHY status.

When the above method is employed in a communication apparatus including a main system unit and a communication system unit such as a TOE (TCP / IP offload engine), there are the following problems.
When the main system unit performs PHY monitoring control, exclusive processing related to the access of the MAC / PHY device (hereinafter referred to as the MAC / PHY unit) is required with the communication system unit that performs data transmission / reception.
-Since the processing speed of interrupt control is slow and the time cost is high, there are cases where a communication system unit such as TOE that aims at speeding up cannot be configured to perform interrupt control.
-Continuous polling in the communication system unit may cause a decrease in throughput and data loss.

The IEEE 802.3 Working Group develops standards for Ethernet based LANs (http://www.ieee802.org/3/)

  The present invention can also be applied to a communication system unit that cannot perform interrupt control, and an object of the present invention is to realize physical layer (PHY) monitoring control that can prevent a decrease in throughput and data loss.

  The present invention has the following configuration as one means for achieving the above object.

  A communication apparatus according to the present invention includes a main system unit that performs application processing and a communication system unit that performs communication processing via a physical layer, and the main system unit detects detection of a change in the state of the physical layer. And an instruction means for instructing the communication system section regarding physical layer monitoring control when the detection means detects a state change in the physical layer, the communication system section following the instruction of the instruction means Based on this, the physical layer monitoring control is performed.

  The present invention can be applied to a communication system unit that cannot perform interrupt control, and can realize physical layer (PHY) monitoring control that can prevent a reduction in throughput and data loss.

The figure explaining the sequence of PHY monitoring control. The figure explaining the sequence of polling. The block diagram which shows the structural example of the communication apparatus of an Example. The figure which shows the example of a sequence of a communication apparatus when the state change of PHY arises during communication with an opposing communication apparatus. 6 is a flowchart for explaining processing in which a main system unit instructs a communication system unit to perform PHY monitoring control. The flowchart explaining the process regarding the PHY monitoring control of a communication system part. The figure which shows the example of a sequence of a communication apparatus when the state change of PHY arises during communication with an opposing communication apparatus. The flowchart explaining the process which a main system part instruct | indicates execution of PHY monitoring control to a communication system part. The flowchart explaining the process regarding the PHY monitoring control of a communication system part.

  Hereinafter, a communication apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. Although an example using a wired LAN will be described below, the communication form is not limited to this, and various modifications can be made within the scope of the technical idea.

[Overview of PHY monitoring control and polling]
A sequence of PHY monitoring control will be described with reference to FIG. FIG. 1A shows a sequence in which the main system unit receives an interrupt from the MAC / PHY unit and performs physical layer monitoring control (PHY monitoring control) when the state of the physical layer (PHY) changes.

  In the data reception sequence of the communication apparatus, the communication system unit receives data from the MAC / PHY unit (S101), and the main system unit receives data from the communication system unit (S102). In the data transmission sequence, the main system unit transmits data to the communication system unit (S103), and the communication system unit transmits data to the MAC / PHY unit (S104). That is, the communication system unit performs access of the MAC / PHY unit related to data transmission / reception.

  When the state of the PHY changes, the main system unit receives an interrupt from the MAC / PHY unit (S105), and performs PHY monitoring control of the MAC / PHY unit (S106). In this case, both the main system unit and the communication system unit access the MAC / PHY unit, and exclusive control related to access of the MAC / PHY unit is required between both systems.

  FIG. 1B shows a sequence in which the communication system unit receives an interrupt from the MAC / PHY unit and performs PHY monitoring control when the state of the PHY changes. In this case, exclusive control related to the access of the MAC / PHY unit is unnecessary, but a mechanism for receiving an interrupt in the communication system unit is necessary. However, this sequence cannot be realized in a communication system unit that cannot perform interrupt control.

  The polling sequence will be described with reference to FIG. FIG. 2 (a) shows a sequence in which the main system unit performs polling. In this case, the main system unit accesses the MAC / PHY unit for PHY monitoring control, and the communication system unit accesses the MAC / PHY unit for data transmission / reception. Therefore, exclusive control regarding access of the MAC / PHY unit is required between both systems. Further, polling (S107, S108, S109) reduces the opportunity for data transmission / reception, which may cause a reduction in throughput and data loss.

  FIG. 2 (b) shows a sequence in which the communication system section performs polling. The communication system unit accesses the MAC / PHY unit for data transmission / reception and PHY monitoring control. Therefore, although exclusive control related to the access of the MAC / PHY unit is unnecessary, the opportunity of data transmission / reception is reduced by polling (S107, S108, S109), which may cause a reduction in throughput and data loss.

  In addition, many commercially available MAC / PHY devices employ a low-speed serial communication interface as a mechanism for accessing a register or memory indicating the state of the PHY. Such a serial communication interface is called MDIO (management data input / output) defined by IEEE802.3.

[Device configuration]
A block diagram of FIG. 3 shows a configuration example of the communication apparatus 100 of the embodiment. Communication device 100 can execute various applications and communicate with other devices as necessary.

Main System Unit The main system unit 110 mainly performs application processing, control of the communication system unit 120, and detection of changes in the physical layer (PHY) of the MAC / PHY unit 130.

  The control unit 111 has a CPU and executes a program stored in a ROM or the like using a RAM as a work memory to realize or control the configuration of the main system unit 110. The storage unit 112 includes a ROM that stores various information such as programs executed by the control unit 111, a RAM that is used as a work memory, and the like.

  The App unit 113 is various applications realized by the processing of the control unit 111, provides various functions to the user, and passes through the communication system driver 115, the communication system unit 120, and the MAC / PHY unit 130 as necessary. Communicate with the opposite communication device. The input / output unit 114 receives various inputs from the user, and outputs various types of information by display using an LCD or LED, or by outputting sound using a speaker or the like. The communication system driver 115 performs various controls of the communication system unit 120, and when there is a state change in the PHY, it receives an interrupt from the MAC / PHY unit 130 and detects the state change of the PHY.

Communication System Unit The communication system unit 120 mainly performs communication processing such as protocol processing and PHY monitoring control.

  The control unit 121 has a CPU and executes a program stored in a ROM or the like using a RAM as a work memory to realize or control each configuration of the communication system unit 120. The storage unit 122 includes a ROM that stores various information such as a program executed by the control unit 121, a RAM that is used as a work memory, and the like. The storage unit 122 further stores various information such as communication parameters used by the protocol stack unit 123 and the PHY monitoring MAC control unit 124.

  The protocol stack unit 123 performs protocol processing such as TCP / IP in the network communication protocol stack. The PHY monitoring MAC control unit 124 confirms the state of the PHY of the MAC / PHY unit 130 based on an instruction from the communication system driver 115, and performs MAC control and PHY monitoring control as necessary.

● MAC / PHY section
The MAC / PHY unit 130 is a MAC / PHY device that realizes processing of the MAC layer and the PHY layer. The main system unit 110, the communication system unit 120, and the MAC / PHY unit 130 are connected to each other via the system bus 101.

[Communication device sequence]
Example in which main system unit instructs start and end of PHY monitoring control FIG. 4 shows a sequence example of the communication device 100 when a change in the state of the PHY occurs during communication with the opposite communication device.

  When the PHY state change occurs, the MAC / PHY unit 130 notifies the main system unit 110 of an interrupt as a state change notification (S201). Receiving the state change notification, the main system unit 110 determines the interrupt factor, and detects that the state change of the PHY has occurred by the communication system driver 115.

  Note that the PHY state change occurs when the communication speed (10 Mbps, 100 Mbps, 1000 Mbps, etc.), communication mode (half duplex, full duplex), link state (link up, link down), etc. change. For example, in the case of insertion / removal of a network cable, a state change of the PHY occurs when the network cable is inserted into the communication apparatus 100 and when the cable is disconnected from the communication apparatus 100.

  The communication system driver 115 instructs the PHY monitoring MAC control unit 124 of the communication system unit 120 to start PHY monitoring control (S202). For example, a PHY monitoring control instruction flag is arranged in the storage unit 122 of the communication system unit 120, and the communication system unit 120 performs PHY monitoring control while the value of the flag is other than “0”. The communication system unit 120 is prevented from performing PHY monitoring control. That is, the communication system driver 115 changes the value of the PHY monitoring control instruction flag from ‘0’ to other than ‘0’ as a PHY monitoring control start instruction, and the PHY monitoring MAC control unit 124 refers to the flag. Instead of the storage unit 122, information for instructing execution of PHY monitoring control may be stored in another memory or register such as the storage unit 112 of the main system unit 110.

  The PHY monitoring MAC control 124 is repeated while the value of the PHY monitoring control instruction flag is other than “0”, and refers to a register or memory indicating the PHY state of the MAC / PHY unit 130. Then, MAC / PHY control such as transmission / reception valid / invalid switching setting, communication speed and communication mode setting is performed on the MAC / PHY unit 130 as necessary (S203,..., S204).

  When the predetermined time has elapsed, the communication system driver 115 changes the value of the PHY monitoring control instruction flag from “0” to “0”, and instructs the end of the PHY monitoring control (S205). In accordance with this instruction, the PHY monitoring MAC control unit 124 ends the PHY monitoring control.

  A process in which the main system unit 110 instructs the communication system unit 120 to perform PHY monitoring control will be described with reference to the flowchart of FIG. The process shown in FIG. 5 is executed every time the main system unit 110 detects a change in the state of the PHY.

  When a PHY state change occurs, the main system unit 110 receives an interrupt from the MAC / PHY unit 130 as a state change notification, determines an interrupt factor, and detects that the PHY state change has occurred by the communication system driver 115. (S301). The communication system driver 115 starts a timer for measuring a predetermined time (S302), and instructs the communication system unit 120 to start PHY monitoring control (S303).

  Next, the communication system driver 115 determines whether or not the started timer has timed out, and continues to monitor the timer until time out (S304). If a new interrupt is received from the MAC / PHY unit 130 before the timeout, the new interrupt may be ignored, or the process may be returned to step S302 to restart the timer. Then, when timed out, the communication system driver 115 instructs the communication system unit 120 to end the PHY monitoring control (S305).

  Processing related to PHY monitoring control of the communication system unit 120 will be described with reference to the flowchart of FIG. The process shown in FIG. 6 is executed each time the communication system unit 120 operating in an event-driven state checks a PHY monitoring control event that is performed when checking various events such as a transmission event and a reception event.

  The PHY monitoring MAC control unit 124 determines whether the value of the PHY monitoring control instruction flag is other than “0”, that is, whether the PHY monitoring control is valid (S401). If PHY monitoring control is disabled, the process ends and other event checks are performed. When PHY monitoring control is enabled, the PHY monitoring MAC control unit 124 refers to a register or memory indicating the PHY state of the MAC / PHY unit 130, and if necessary, sends a MAC to the MAC / PHY unit 130. Control and PHY monitoring control are performed (S402).

  As described above, when the state of the PHY changes, the communication system driver 115 changes the value of the PHY monitoring control instruction flag and switches between enabling / disabling of the PHY monitoring control. The PHY monitoring MAC control unit 124 executes PHY monitoring control during a period when the value of the PHY monitoring control instruction flag is valid.

Example of Main System Unit Instructing Execution of PHY Monitoring Control FIG. 7 shows a sequence example of the communication device 100 when a PHY state change occurs during communication with the opposite communication device.

  When the PHY state change occurs, the MAC / PHY unit 130 notifies the main system unit 110 of an interrupt as a state change notification (S501). Receiving the state change notification, the main system unit 110 determines the interrupt factor, and detects that the state change of the PHY has occurred by the communication system driver 115.

  The communication system driver 115 instructs the PHY monitoring MAC control unit 124 of the communication system unit 120 to execute PHY monitoring control (S502). This instruction may be performed by the communication system driver 115 changing the value of the PHY monitoring control instruction flag to a value other than “0”, for example, as described above.

  The PHY monitoring MAC control 124 refers to a register or memory indicating the PHY state of the MAC / PHY unit 130 when the value of the PHY monitoring control instruction flag is other than “0”. Then, as necessary, the MAC / PHY unit 130 performs MAC / PHY control such as transmission / reception valid / invalid switching setting, communication speed and communication mode setting (S503).

  A process in which the main system unit 110 instructs the communication system unit 120 to execute PHY monitoring control will be described with reference to the flowchart of FIG. The process shown in FIG. 8 is executed every time the main system unit 110 detects a change in the state of the PHY.

  When a PHY state change occurs, the main system unit 110 receives an interrupt from the MAC / PHY unit 130 as a state change notification, determines an interrupt factor, and detects that the PHY state change has occurred by the communication system driver 115. (S601). The communication system driver 115 instructs the communication system unit 120 to execute PHY monitoring control (S602).

  Processing related to PHY monitoring control of the communication system unit 120 will be described with reference to the flowchart of FIG. The process shown in FIG. 9 is executed each time the communication system unit 120 operating in an event-driven state checks a PHY monitoring control event that is performed when checking various events such as a transmission event and a reception event.

  The PHY monitoring MAC control unit 124 determines whether the value of the PHY monitoring control instruction flag is other than “0”, that is, whether execution of PHY monitoring control is instructed (S701). If execution of PHY monitoring control is not instructed, the process is terminated and another event check is performed. When execution of PHY monitoring control is instructed, the PHY monitoring MAC control unit 124 refers to a register or memory indicating the state of the PHY of the MAC / PHY unit 130. Then, MAC control and PHY monitoring control are performed on the MAC / PHY unit 130 as necessary (S702). Thereafter, the PHY monitoring MAC control unit 124 sets “0” to the value of the PHY monitoring control instruction flag, and sets the completion of execution of the PHY monitoring control (S703).

  As described above, when the state of the PHY changes, the communication system driver 115 changes the value of the PHY monitoring control instruction flag and instructs execution of the PHY monitoring control. When the value of the PHY monitoring control instruction flag indicates execution of PHY monitoring control, the PHY monitoring MAC control unit 124 executes PHY monitoring control only once.

  In the above description, the example in which the main system unit 110 instructs the start and end of the PHY monitoring control and the example in which the main system unit 110 instructs the execution of the PHY monitoring control have been described. In the processing described above, the main system unit 110 detects a change in the state of the PHY by an interrupt, so that the communication system unit 120 that does not support interrupt control can be handled. This is because, in the communication system unit 120 such as the TOE, which is aimed at speeding up, interrupt control that performs processing upon receiving an interrupt notification may have a configuration that cannot be implemented due to low processing speed and high time cost. is there.

  Further, the above-described exclusive control between the main system unit 110 and the communication system unit 120 is not required by centralizing access to the MAC / PHY unit 130 such as data transmission / reception processing and PHY monitoring control in the communication system unit 120. In addition, by performing PHY monitoring control instructions through processing with a low time cost via the PHY monitoring control instruction flag, it is possible to prevent throughput degradation and packet loss (data loss) that are problematic in polling operations and the like. .

[Other Examples]
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, etc.) of the system or apparatus reads the program. It is a process to be executed.

Claims (8)

  1. A communication device,
    A main system unit that performs application processing;
    A communication system unit that performs communication processing via the physical layer,
    The main system unit includes a detecting unit that detects a state change of the physical layer, and an instruction unit that instructs the communication system unit regarding physical layer monitoring control when the detecting unit detects a state change in the physical layer. Have
    The communication system, wherein the communication system unit performs the physical layer monitoring control based on an instruction from the instruction unit.
  2.   The instructing unit instructs the communication system unit to start the physical layer monitoring control, and instructs the communication system unit to end the physical layer monitoring control when a predetermined time elapses after the start instruction. 2. The communication device according to claim 1, wherein:
  3.   3. The communication apparatus according to claim 2, wherein the communication system unit repeatedly executes the physical layer monitoring control for a period until the end is instructed after the start is instructed.
  4.   2. The instructing unit instructs the communication system unit to execute the physical layer monitoring control, and the communication system unit executes the physical layer monitoring control in response to the execution instruction. Communication device.
  5.   5. The communication apparatus according to claim 1, wherein the state change notification is performed by interruption.
  6.   6. The instruction from the instruction unit to the communication system unit is performed via a flag arranged in a storage unit included in the communication system unit. Communication device.
  7. A control method of a communication apparatus having a main system unit that performs application processing and a communication system unit that performs communication processing via a physical layer,
    The detection means of the main system unit detects a state change of the physical layer,
    When the detection unit detects a change in the state of the physical layer, the instruction unit of the main system unit issues an instruction regarding physical layer monitoring control to the communication system unit,
    The control method, wherein the communication system unit performs the physical layer monitoring control based on an instruction from the instruction unit.
  8.   A program for causing a computer to function as each unit and each unit of the communication device according to any one of claims 1 to 6.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014007675A (en) * 2012-06-27 2014-01-16 Nec Access Technica Ltd Communication apparatus, communication method and program
WO2017099006A1 (en) * 2015-12-09 2017-06-15 日本精機株式会社 Electronic control device

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Publication number Priority date Publication date Assignee Title
JP2006050510A (en) * 2003-09-03 2006-02-16 Sharp Corp Information processing device, radio module, electronic control device, power control method, power control program, and recording medium
JP2008129767A (en) * 2006-11-20 2008-06-05 Mitsubishi Electric Corp Network apparatus
JP2012253511A (en) * 2011-06-01 2012-12-20 Ricoh Co Ltd Communication device and communication method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006050510A (en) * 2003-09-03 2006-02-16 Sharp Corp Information processing device, radio module, electronic control device, power control method, power control program, and recording medium
JP2008129767A (en) * 2006-11-20 2008-06-05 Mitsubishi Electric Corp Network apparatus
JP2012253511A (en) * 2011-06-01 2012-12-20 Ricoh Co Ltd Communication device and communication method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014007675A (en) * 2012-06-27 2014-01-16 Nec Access Technica Ltd Communication apparatus, communication method and program
WO2017099006A1 (en) * 2015-12-09 2017-06-15 日本精機株式会社 Electronic control device

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