JPH11331198A - Instrument and method for measurement and distributing medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure data transmitted on a bus, while minimizing the effects upon a communication state of the equipment to be a measuring object. SOLUTION: Even if a communication agreement layer except a physical layer is operating in the case of initializing an IEEE1394 serial bus, a self- identification data(ID) setting part 31 sets the data which reports that the layer is not operating to the other equipment to a serial bus control part 35. The serial bus control part 35 has a communication procedure specified by IEEE1394 and transmits the data set by the self-ID setting part 31 to the other equipment, and a packet and a confirm signal are received from the other equipment connected to the bus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device, a measuring method, and a providing medium for measuring a communication state of a bus.
In particular, the present invention relates to a measuring device, a measuring method, and a providing medium that have less influence on a communication state of a bus.

[0002]

2. Description of the Related Art FIG. 10 is a diagram showing a connection example of a measuring device when measuring the communication state of a plurality of devices connected by an IEEE1394 serial bus. The measuring device 1 is a PC (P) connected to each other by IEEE1394 serial buses 7-1 to 7-4.
ersonal Computer) 2, Digital VTR (Video Tape Record)
er) 3, MD (Mini Disk (trademark)) deck 4, AV (Audio Visua)
l) The server 5 that supplies data and the HDD (Hard Disk Drive) 6 that records or outputs AV data captures and displays, via the IEEE1394 serial bus 7-5, data that is communicated via the IEEE1394 serial bus. Measuring device 1
However, in order to capture data communicated on the bus, communication with other devices must be established, and it is necessary to conform to IEEE1394. Devices connected to the IEEE 1394 serial bus constitute nodes on IEEE 1394.

FIG. 11 shows an IEEE1394 protocol (Protoco
1 is a diagram for explaining the structure of a function of (l: communication protocol). IEEE13
The 94 protocol is based on the Transaction Layer
er) 12, a link layer (Link Layer) 13, and a physical layer (Ph
ysical Layer) 14. Each layer communicates with each other, and each layer communicates with a serial bus management (Serial Bus Management) 11.

The protocol of each layer is composed of a structure of data to be handled and a procedure for transmitting and receiving the data. At the start of communication, the state including the configuration of the communication protocol layer of the device connected to the bus is mutually confirmed by predetermined data communication, and thereafter,
Sends and receives data for device operation. Measuring device 1
Upon connection to the IEEE 1394 serial bus, initialization and reconfiguration of the bus are performed. At this time, if the link layer 13 is operating according to the IEEE 1394 protocol, the link layer 13 is operated. Is transmitted to another device including data indicating that the packet is being transmitted.

[0005]

Other devices that have received a packet containing data indicating that the link layer 13 of the measurement device 1 is operating communicate with the measurement device 1 in a specific communication at the link layer. Has started and is about to be evaluated
Because it changes the communication state of the IEEE1394 serial bus,
Accurate evaluation may not be possible. For example, another device connected to the IEEE1394 serial bus may start communication with the measurement device 1 such as an inquiry of a node unique ID (Identification Data). Furthermore, if the measuring device 1 does not correctly respond to this inquiry, the measuring device 1 may hang up the entire bus.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is intended to measure data transmitted on a bus while minimizing an influence on a communication state of a bus of a device to be measured. The purpose is to do.

[0007]

According to the first aspect of the present invention, at the time of initialization of the bus, a communication protocol layer other than the physical layer of the measurement device operates on other devices connected to the bus when the bus is initialized. The data setting means for setting data for notifying that a communication protocol layer other than the physical layer is not operating, and the data set by the transmission data setting means are transmitted to other devices connected to the bus. Data transmission means.

According to a second aspect of the present invention, there is provided a measuring method, wherein at the time of initialization of a bus, even if a communication protocol layer other than the physical layer of the measuring device is operating on another device connected to the bus, the measurement method is not used. A data setting step of setting data notifying that the communication protocol layer is not operating, and a data transmission step of transmitting the data set in the transmission data setting step to another device connected to the bus. It is characterized by.

According to the third aspect of the present invention, the providing medium is provided to the measuring device, to the other device connected to the bus when the bus is initialized,
Even if a communication protocol layer other than the physical layer of the measurement device is operating,
A data setting step of setting data notifying that a communication protocol layer other than the physical layer is not operating, and a data transmission step of transmitting the data set in the transmission data setting step to another device connected to the bus And a computer-readable program for executing a process including:

In the measuring apparatus, the measuring method, and the providing medium of the present invention, even when a communication protocol layer other than the physical layer is operating when the bus is initialized, the communication protocol layer other than the physical layer is operating. The data notifying the absence is transmitted to another device.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below. In order to clarify the correspondence between each means of the invention described in the claims and the following embodiments, each means is described. When the features of the present invention are described by adding the corresponding embodiment (however, an example) in parentheses after the parentheses, the result is as follows. However, of course, this description does not mean that each means is limited to those described.

That is, the measuring device according to claim 1 is
At the time of initialization of the bus, the other devices connected to the bus are notified that the communication protocol layer other than the physical layer is not operating even if the communication protocol layer other than the physical layer of the measuring device is operating. Data setting means for setting data (for example, the self ID shown in FIG. 2)
Setting unit 31), and a data transmission unit (for example, the serial bus control unit 35 in FIG. 2) for transmitting data set by the transmission data setting unit to another device connected to the bus. I do.

Next, a measuring apparatus to which the present invention is applied will be described. The basic connection state is the same as that shown in FIG.

FIG. 1 is a hardware configuration diagram of the measuring apparatus 1. The CPU (Central Processing Unit) 21 is configured to actually execute various programs. ROM (Re
The ad only memory 22 is configured to store basically fixed data among programs and calculation parameters used by the CPU 21. RAM (Random Access Memory)
Reference numeral 23 stores a program to be executed by the CPU 21 and parameters that change as appropriate during the execution.

The monitor 25 and the keyboard 26 are connected to an internal bus via an input / output interface 24. The monitor 25 displays data supplied from the CPU 21 or the LINK layer processing circuit 27. The keyboard 26 outputs a signal corresponding to a user operation,
The data is supplied to the CPU 21 or the LINK layer processing circuit 27.

The LINK layer processing circuit 27 corresponds to the IEEE1394 of FIG.
The transmission / reception processing procedure of the link layer 13 of the protocol is executed. The PHY layer processing circuit 28
4 The serial bus 7-5 is connected to execute the transmission / reception processing procedure of the physical layer 14 of the IEEE1394 protocol of FIG. The LINK layer processing circuit 27 and the PHY layer processing circuit 28 are connected by a bus. The input / output interface 24, the CPU 21, the ROM 22, the RAM 23, and the LINK layer processing circuit 27 are interconnected by an internal bus.

FIG. 2 shows the CPU 21, PHY layer processing circuit 28, and LI of the measuring apparatus 1 having the above-described hardware configuration.
FIG. 3 is a functional block diagram of a program executed by an NK layer processing circuit 27. The self-ID setting unit 31 is provided with the IEEE1394 serial bus 7 (hereinafter, IEEE1394 serial bus 7-1 to 7-5).
When the communication protocol layer other than the physical layer is operating at the time of initialization of the serial bus 7 when it is not necessary to individually distinguish the To the serial bus control unit 35
Set to. The packet detection unit 32 stores a predetermined data pattern when the user operates the keyboard 26,
The serial bus control unit 35 detects a match between the data pattern of the received packet and the stored data pattern,
The packet storage unit 34 is instructed to store the subsequent packets.

The packet display unit 33 transmits the data of the packet received by the serial bus control unit 35 or the data of the packet stored in the packet storage unit 34 to the monitor 25 via the input / output interface 24.
5 displays the data of the packet. Packet storage unit 3
Reference numeral 4 denotes a storage request of the packet detection unit 32 or a setting made by operating the keyboard 26 by the user, and stores all or a part of the packets output from the serial bus control unit 35. The serial bus control unit 35 has a communication procedure defined by IEEE1394, transmits the data set by the self-ID setting unit 31 to another device, and transmits a packet from another device connected to the IEEE1394 serial bus 7. Receive a confirmation signal. When displaying a packet transmitted on the IEEE1394 serial bus 7, the serial bus control unit 35
All packets are received, including packets transmitted to other devices on the serial bus 7.

Next, when the measuring device 1 is connected to the IEEE1394 serial bus 7, the IEEE1394 serial bus 7
Will be described. IEEE1394
When the state of the node changes due to the connector of the serial bus 7 being pulled out or inserted, the physical layer 14 of each device connected to the IEEE 1394 serial bus 7 executes a bus reset to perform the bus configuration. Do.

FIG. 3 is a flowchart for explaining the bus configuration process. In step S11, the physical layer 14 of the node (for example, the HDD 6 in FIG. 10) from which the connector has been pulled out or inserted erases all the topology information, and sends a bus reset signal to the physical layer.
Send to all other nodes. The physical layer 14 of the node that has received the bus reset signal deletes all topology information. Thereafter, if the physical layer 14 of each node determines that the physical layer 14 is connected to two or more other nodes,
1 is determined to be connected to another node, the leaf (L
eaf) or if it is determined that it is not connected to another node, no connection is set as topology information.

FIG. 4 is a diagram showing an example of the state of the nodes after the transmission and reception of the bus reset signal in step S11 of FIG. 3 (not corresponding to the connection state shown in FIG. 10). The physical layer 14 of node A, node C, and node E
Since it is connected to one other node, a leaf is set as topology information. Physical layer 1 of node B and node D
4 is connected to the other two or three nodes, and thus sets a branch as topology information.

Returning to FIG. 3, in step S12, a tree ID process for setting a port state is executed. First, ports that are not connected to other nodes
The physical layer 14 is set to Off. Next, the physical layer 14 of the node set as a leaf sets a child (Child) as a port and sets a parent notify (ParentNo.
tify) signal from that port. The physical layer 14 of the node that has received this signal, the port that has received the signal,
A parent is set, and the parent-child relationship between the port transmitting the parent notify signal and the port receiving the parent notify signal is determined. Physical layer 14 of the node set in the branch
When the number of ports for which the parent-child relationship has not been determined becomes one, a child (Child) is set to that port, and a parent notify signal is transmitted from that port. The physical layer 14 of the node in which all ports are set as child (one node set as branch) resets the topology information to the root (Root) (FIG. 5). In this way,
All nodes are set to either leaf, branch, or root. Also, all ports are set to either off, parent, or child.

FIG. 5 is a diagram showing an example of the state of the nodes after the execution of the tree ID process in step S12 of FIG. First, the ports # 2 to # 7 of node A and # 1 of node C, which are ports not connected to other nodes, are set to off in the physical layer 14 of the node. Set with leaf
The physical layers 14 of node A, node C, and node E are port # 1 of nodeA, port # 2 of node C, and port # 1 of node E.
Transmits a parent notify signal, and sets each port to parent (p). Ports # 2 and # 3 of node D and port # 1 of node B receive a parent notify signal and are set to child (ch) by the physical layer 14 of that node. The port of that node D
After the setting of # 2 and # 3, the physical layer 14 of the node D, which is set as a branch, has one undecided port (#
1) Send a parent notify signal from port # 1. The physical layer 14 of the node B receiving the parent notify signal at the port # 2 sets all the ports to child and sets the topology information to the root.

Referring back to FIG. 3, in step S13, a self-setting for setting the physical IDs of all the nodes connected to the bus is performed.
The ID process runs. The physical ID is the control and status register (Contr.
ol & Status Register) is specified by 6 bits in the node ID register which is one of the main registers. Step S
By clearing the 11 topology information, the self ID counts of all nodes are set to 0. First, the physical layer 14 of the root node outputs a signal called a grant from one port. The physical layer 14 of the node that has received the grant outputs the grant to any of the ports set as child. As the physical layer 14 of the node receiving the grant repeats the above operation, the grant is successively transferred to the nodes farther from the root via the nodes.

When a grant arrives at a node that does not have a port set as a child (a node set as a leaf), the physical layer 14 of the node sets the physical layer of the node.
The ID of the current self ID count is set to 0, and a self ID packet is transmitted. Upon receiving the self ID packet, the physical layer 14 of all other nodes connected to the bus increments the self ID count. Next, the physical layer 14 of the node set as the root or the branch
When the self-ID packet is received by the port that has output the grant, the child outputs the grant from the port set as a child that has not output the grant yet. This signal is also successively transferred to the node where the physical ID is not set in the same manner as described above. Furthermore, the physical layer 14 of the node that cannot transfer the grant sets the current value of the self ID count to the physical ID and transmits a self ID packet. By repeating this, a physical ID having no overlap is set to all nodes.

FIG. 6 is a diagram showing an example of the state of the node after the execution of the self ID process in step S13 of FIG. The physical layer 14 of node B, which is the root, outputs the grant from port # 1 to node A. Grant received
The physical layer 14 of node A sets the self ID count of 0 to the physical ID
And output a self ID packet. The physical layer 14 of each of the nodes B, C, D, and E that has received the self ID packet increments the self ID count, and the self ID count of each node becomes 1.

After that, the physical layer 14 of the node B
Since the self ID packet has been received from port # 2, the grant is output to node D from port # 2. Received the grant
The physical layer 14 of nodeD transfers the grant from port # 2 to node C.
Output to Physical layer 14 of node C that received the grant
Sets the self ID count to 1 as the physical ID,
Output a packet. Node that received the self ID packet
Each physical layer 14 of B, node D, and node E
The self ID count is incremented, and the self ID count of each node becomes 2. Next, since the physical layer 14 of node D has received the self ID packet on port # 2, it outputs a grant from port # 3 to node E.

Physical layer 14 of node E receiving the grant
Sets the self ID count of 2 to the physical ID and sets the self ID
Output a packet. Received the self ID packet
Each physical layer 14 of nodeD and node B
The D count is incremented, and the self ID count of each node becomes 3. The physical layer 14 of node D outputs a grant from all ports labeled as child and receives a self ID packet on all ports.
Output ID packet. The physical layer 14 of the node B receiving the self ID packet increments the self ID count, and the value becomes 4. Here, since the node B also outputs the grant from all the ports labeled as child, the physical layer 14 of the node B sets the self ID count of 4 to the physical ID and outputs the self ID packet,
The self-ID process ends.

Next, the self ID packet output by the physical layer 14 of each node in the self ID process will be described.
FIG. 7 is a diagram illustrating an example of the structure of the self ID packet.
In the self-ID process, one to four self-ID packets are output from the physical layer 14 of each node. The self ID packet shown in FIG. 7 is an example of a single self ID packet or a self ID packet output first. The first 32 bits of the self ID packet are valid data, and the remaining 32 bits are used for error detection.

FIG. 8 is a diagram for explaining the components of the self ID packet. The content described in the cell below the cell in which the name is described in the top row corresponds to the name of the component of the self ID packet in FIG. A cell placed at the position where the rightward extension area of the content described in the cell below the cell described as the field of the top row and the downward extension area described in the top row content Shows the contents of the components of the self ID packet of FIG. Self ID
The node that has received the packet is 1
By reading the information stored in the field L of the 0th bit, it is possible to know the operation state of the link layer 13 of the node that has output the self ID packet. Other devices that know that the link layer 13 of a given device is operating can execute communication with the given device via the link layer 13.

In order for the measuring device 1 to capture and display packets via the link layer 13 of another device connected to the IEEE1394 serial bus 7, the link layer 13 of the measuring device 1 needs to be operating. . However, the measuring device 1 sets information indicating that the link layer 13 of the measuring device 1 is not operating in the field L of the self-ID packet output during the self-ID process, and stores the self-ID packet in another field. Output to device. By doing so, other devices connected to the IEEE1394 serial bus 7 do not execute communication with the measuring device 1 via the link layer 13.

Next, the operation of the measurement device 1 for displaying data of a predetermined packet on the IEEE1394 serial bus 7 will be described. FIG. 9 is a flowchart illustrating an operation in which the measuring device 1 displays a predetermined number of packets transmitted on the IEEE1394 serial bus 7 after detecting a predetermined packet on the IEEE1394 serial bus 7. Step S2
In 1, the user operates the keyboard 26 to set the data pattern of the packet whose measurement is to be started in the packet detection unit 32. For example, if the user uses a digital VTR
In order to confirm the packet on the IEEE1394 serial bus 7 after the read request to the third server 5, the ID of the server 5 is set as the destination ID of the packet element and the ID of the digital VTR 3 is set as the source ID of the packet element A packet in which the code corresponding to the asynchronous packet read request is set in the transaction code of the packet element is set in the packet detection unit 32.

In step S22, the packet detecting section 32 fetches all the packets transmitted on the IEEE1394 serial bus 7 via the serial bus control section 35, and matches the data pattern set in step S21. It is determined whether or not. In step S22,
If it is determined that the packet does not match the data pattern, the procedure returns to step S22, and the process of detecting the data pattern is continued. If it is determined in step S22 that the packet and the data pattern match,
The procedure proceeds to step S23. In step S23, the packet storage unit 34 fetches and stores all the packets transmitted on the IEEE1394 serial bus 7 via the serial bus control unit 25 until the number of packets reaches a predetermined number. In step S24, the packet display unit 33
A predetermined number of packets stored in the packet storage unit 34 are displayed on the monitor 25.

As described above, when the measuring device 1 is connected to the IEEE1394 serial bus, the measuring device 1 executes only the minimum communication for enabling other devices to communicate, and performs communication from the other device. Since it is not required, the measuring device 1 can measure the IEEE1394 serial bus in a communication state very close to the state before the connection.

In this specification, the IEEE 1394 serial bus has been described as an example, but the present invention is applicable to any bus having a plurality of communication layer functions.

Further, as a providing medium for providing a user with a computer program for performing the above-described processing,
In addition to recording media such as magnetic disks, CD-ROMs, and solid-state memories, communication media such as networks and satellites can be used.

[0037]

As described above, according to the measuring apparatus, the measuring method, and the providing medium of the present invention, data indicating that a communication protocol layer other than the physical layer is not operating is transmitted to another apparatus. With this configuration, it is possible to measure data transmitted on the bus with a minimum effect on the communication state of the bus to be measured.

[Brief description of the drawings]

FIG. 1 is a hardware configuration diagram of a measurement device.

FIG. 2 is a functional block diagram of the measuring device.

FIG. 3 is a flowchart illustrating a bus configuration process.

FIG. 4 is a diagram illustrating an example of a state of a node after transmission / reception of a bus reset signal;

FIG. 5 is a diagram illustrating an example of a state of a node after execution of a tree ID process;

FIG. 6 is a diagram illustrating an example of a state of a node after execution of a self-ID process.

FIG. 7 is a diagram showing an example of the structure of a self ID packet.

FIG. 8 is a diagram illustrating components of a self ID packet.

FIG. 9 is a flowchart illustrating an operation of displaying data of a predetermined packet on a bus of the measuring device.

FIG. 10 is a diagram showing connections of a measuring device.

FIG. 11 is a diagram illustrating the structure of the function of the IEEE1394 protocol.

[Explanation of symbols]

1 Measurement device, 31 Self ID setting unit, 35 Serial bus control unit

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04L 29/14

Claims (3)

[Claims] 1. A measuring device connected to a bus having a plurality of communication protocol layers and measuring a communication state of the bus, wherein at the time of initialization of the bus, another device connected to the bus performs the measurement. Even if a communication protocol layer other than the physical layer of the device is operating, data setting means for setting data notifying that the communication protocol layer other than the physical layer is not operating, and the transmission data setting means A data transmission unit for transmitting data to the another device connected to the bus. 2. A measuring method of a measuring device for connecting to a bus having a plurality of communication protocol layers and measuring a communication state of the bus, wherein, when the bus is initialized, the other devices connected to the bus are connected to each other. Even if a communication protocol layer other than the physical layer of the measuring device is operating, a data setting step of setting data notifying that a communication protocol layer other than the physical layer is not operating, and the transmission data setting step A data transmission step of transmitting the set data to the another device connected to the bus. 3. A measuring device for connecting to a bus having a plurality of communication protocol layers and measuring a communication state of the bus, wherein, when the bus is initialized, the measuring device is connected to another device connected to the bus. Even if a communication protocol layer other than the physical layer of the device is operating, a data setting step of setting data notifying that a communication protocol layer other than the physical layer is not operating, and the data setting step set in the transmission data setting step A computer-readable storage medium for providing a computer-readable program for executing a process including a data transmission step of transmitting data to the another device connected to the bus.