JP2003037598A - Bus analyzer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bus analyzer which makes it easy to observe a connection diagram of information terminal devices even if hubs or repeaters are in cascade connection to increase the number of distributions. SOLUTION: Connection information on devices connected to an IEEE1394 bus is stored in a connection information memory 6 to node IDs. Information on devices directly connected to one device and whether or not the connected devices have device ID numbers is stored in a device information memory 7 by node ID for all connected devices. When devices are directly connected to each other, composed of only integrated circuits of the physical layer, and do not have device ID numbers, they are regarded as a group by referring to the node IDs and assigned a group ID. This group ID is stored in a group information memory. When displaying a connection diagram of devices connected to an IEEE1394 bus based on the connection information on a display means 9, one group stored in the group information memory is displayed as one device.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an IEEE 1394 bus analyzer (hereinafter simply referred to as a bus analyzer). 2. Description of the Related Art The demand for multimedia, such as a home multimedia system or a home network, has been increasing, and an IEEE 1394 high-speed serial bus (IEEE 1394) has been used as a high-speed and low-cost digital transmission medium corresponding to these demands.
E1394 bus) is also known. The devices connected to the IEEE 1394 bus are roughly classified into devices such as video devices, remote control devices, and personal computers, which are information terminals for handling data and commands, and hubs or repeaters for distributing and extending the IEEE 1394 bus. There are two types of so-called devices. In order for a bus analyzer to display a connection diagram based on a topology map, which is connection information of a device, a physical layer integrated circuit called a PHY in the device automatically generates a PHY packet in an initialization sequence in the bus analyzer. This is done by collecting and analyzing. [0005] Normally, in the display of the topology map,
Although a bus analyzer has a function of inquiring device information for each device and displaying additional information, many hubs and repeaters other than the information terminal do not have device information and are treated as unknown devices. [0006] To explain this more specifically, IEEE13
Many hub integrated circuits that distribute 94 buses have about three distributions, and some hubs that are sold as products have a function such as six distributions by cascading a plurality of physical layer integrated circuits. It has become. FIG. 4 shows a connection example using a hub having such a configuration. FIG. 4 shows an amplifier 11 for amplifying an audio signal and a video signal as a device 11, a 6-port hub 12 formed by cascade connection to the device 11 and a video cassette recorder (VCR) as a device 13, and a bus analyzer This is an example in which is connected as a device 14, a set-top box as a device 15, a television receiver as a device 16, and a personal computer as a device 17. However, when the connection example shown in FIG. 4 is displayed on the topology map display of the bus analyzer 14, as shown in FIG. The number of integrated circuits in the physical layer,
That is, the connection information of the integrated circuit of the physical layer indicated by reference numerals 18 and 19 is extra
9, there is a problem that it is difficult to see the connection state of devices other than the hub in the continuous drawing. Here, in FIG. 5, GUID indicates a device identification number read from each device information. SUMMARY OF THE INVENTION It is an object of the present invention to provide a bus analyzer which makes it easy to see a connection diagram of information terminal equipment even when hubs or repeaters are cascaded to increase the number of distributions. [0010] A bus analyzer according to the present invention is a bus analyzer of an IEEE 1394 bus, and connection information of each device connected to one IEEE 1394 bus is corresponded to a node ID. Memory control for storing in the connection information memory and storing in the device information memory for all connected devices, for each node ID, the device directly connected to one device and information as to whether or not the device has a device identification number. Means and a device directly connected to each other consisting only of a physical layer integrated circuit having no device identification number with reference to the node ID, as a group,
Device information determining means for assigning a group ID and storing the group ID in a group information memory;
Display control means for displaying, as one device, one group stored in the group information memory when displaying a connection diagram of devices connected to the E1394 bus on the display means. . According to the bus analyzer of the present invention,
The node ID is referred to from the contents stored in the connection information memory and the contents stored in the device information memory, and the directly connected devices consisting only of the physical layer integrated circuits having no device identification number are determined as one group. The group ID is assigned to the group information memory, and the assigned group ID is stored in the group information memory. When a connection diagram of devices connected to one IEEE 1394 bus is displayed on the display means based on the connection information, the group information memory is used. Is displayed as one device. Therefore, according to the bus analyzer of the present invention, when displaying a device connection diagram based on device connection information, an integrated circuit comprising only cascaded physical layers in order to increase the number of distributions Are displayed collectively as a hub, so that the connection diagram of the devices as the information terminal becomes easy to see. A bus analyzer according to the present invention will be described below with reference to an embodiment. FIG. 1 is a block diagram showing a configuration of a bus analyzer according to an embodiment of the present invention. A bus analyzer 10 according to an embodiment of the present invention includes a control circuit including a physical layer integrated circuit 1 connected to an IEEE 1394 bus, a memory control unit 3, a device information determination unit 4, and a display control unit 5. Unit 2, connection information memory 6, device information memory 7, group information memory 8,
And a display device 9. The memory control unit 3 reads connection information and data maximum transfer speed information sent from each device connected to the IEEE 1394 bus at the time of initialization of the IEEE 1394 bus via the integrated circuit 1 of the physical layer. , I
A node ID assigned to a device connected to the IEEE 1394 bus is stored in the connected device memory 6 in accordance with the node ID assigned thereto, and the IEEE 139 is connected via the physical layer integrated circuit 1 to the IEEE 139.
The device directly connected to one device and the GUID that is the device identification number of the device are read from each device connected to the four buses, and the device directly connected to the device and the device have a GUID. The information as to whether or not it is stored in the device information memory 7 for all connected devices for each node ID. In this case, a device called a hub or a repeater is composed of only an ideal integrated circuit.
, And recognizes that it does not have device information and stores it in the device information memory 7. As described above, the device serving as the information terminal has a GUID, but the hub or repeater is composed of only the physical layer integrated circuit and has no GUID. So, for example,
In FIG. 5, the device 11 and the device 1 are
Devices 8 and 19 are devices directly connected, devices 12 and 13 are devices directly connected to device 11, devices 11 and 13 have a GUID, and devices 12, 18 and 19 do not have a GUID. . Therefore, in the case shown in FIG.
The device information memory 7 stores, for each of the devices 11 to 19, the information of the directly connected device and the G
This means that information as to whether or not it has a UID is stored. Based on the contents stored in the connection information memory 6 and the contents stored in the device information memory 7, the device information judging section 4 determines that the devices are directly connected to each other and have no GUID, that is, they are directly connected to each other but have no GUID. The searched device is searched, the searched device is recognized as a hub, and the device is determined to be a group existing in a device having no GUID stored in the device information memory 7 and assigned to the group. The group ID is stored in the group information memory 8 as group information. Therefore, the group information memory 8 has G
A group of devices directly connected without a UID is stored with a group ID attached. Specifically, in the case shown in FIG.
Are directly connected without a GUID (node I
D is an independent group), and the devices 12, 18, and 19 are stored as one group with group information. The display control unit 5 performs connection based on a topology map based on the connection information stored in the connection information memory 6, the device information stored in the device information memory 7, and the group information stored in the group information memory 8. In the diagram display, display control is performed so that a group of devices directly connected without a GUID is displayed on the display device 9 as one hub. Here, in the initialization sequence of the IEEE 1394 bus, the node ID of each device is set to IEEE.
Assigned based on the E1394 standard. IEEE1
The node ID assigned based on the 394 standard is such that a device connected to a tree-like device is assigned a node ID having a smaller value as the device is connected to a terminal end of the tree-like shape. The bus analyzer 1 configured as described above
The grouping at 0 will be described with reference to the flowchart shown in FIG. When the grouping routine is started, attention is paid to the device having the node ID = 0 (step S1), and it is checked whether or not the GUID of the device exists (step S2). Whether or not the GUID of the device exists is determined by searching the stored contents of the device information memory 7. If it is determined in step S2 that there is no GUID, the node ID of the directly connected device is confirmed following step S2 (step S3).
It is checked whether or not there is a device having a node ID smaller than its own node ID and having no GUID among the directly connected devices (step S).
4). In step S4, when it is determined that there is a device having a node ID smaller than its own node ID and having no GUID among the directly connected devices, no GUID is present. The small node ID is stored as the group ID in the group information memory 8 (step S5). Following step S5, IEEE 1394
It is checked whether or not all the devices connected to the bus have been checked (step S6), and step S6
When it is determined that the confirmation has not been completed for all devices, the next node ID is focused (step S
8) The process is performed from step S2 until all devices connected to the IEEE 1394 bus are confirmed. In the execution of step S2, the GU
If it is determined that the ID exists, the group ID is set as its own node ID (step S7), and the processing is repeatedly executed from step S6. If it is determined in step S4 that there is no device which has a node ID smaller than its own node ID and has no GUID among the directly connected devices, the process proceeds to step S4. The processing is executed from step S7. Therefore, when the grouping shown in FIG. 3 is completed, the physical layer integrated circuit having the GUID refers to the node ID given to the device in the group information memory 8, and the same value as the node ID is stored in the group information memory 8. , The physical layer integrated circuit having no GUID is the smallest node ID in the same group.
Is stored as the group ID. Therefore, the bus analyzer 10 displays the connection diagram on the display device 9 based on the topology map as the connection information.
, The hubs belonging to the same group are displayed as one device using the contents stored in the group information memory 8 and the contents stored in the connection information memory 6, and the display matches the actual connection. One example is the display shown in FIG. 2 similar to FIG. 4 with respect to FIG. Also, when a tree-like device similar to the devices 12 to 17 is connected instead of the device 13, a single hub is displayed in each tree-like display. As described above, according to the bus analyzer of the present invention, when a connection diagram of devices is displayed based on connection information of devices, the bus analyzers are cascaded to increase the number of distributions. Since the integrated circuits consisting only of the physical layers are collectively displayed as a hub, the connection diagram of the information terminal device is displayed in an easily viewable manner.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of a bus analyzer according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing a display example based on a topology map by a bus analyzer according to one embodiment of the present invention. FIG. 3 is a flowchart for explaining grouping in the bus analyzer according to the embodiment of the present invention; FIG. 4 is a schematic diagram illustrating a connection example of devices connected to an IEEE 1394 bus. FIG. 5 is a schematic diagram showing a display example based on a conventional topology map for the connection of FIG. 4; [Description of Signs] 1 Physical layer integrated circuit 2 Control unit 3 Memory control unit 4 Device information determination unit 5 Display control unit 6 Connection information memory 7 Device information memory 8 Group information memory 9 Display device 10 Bus analyzers 11 to 14 Devices

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Mika Togi             1-16-2 Hakusan, Midori-ku, Yokohama-shi Co., Ltd.             Kenwood Tea MI F term (reference) 5K032 DB19 EA02 EA03 EA04 EA07                 5K033 DB12 EA07

Claims (1)

Claims: 1. An IEEE 1394 bus analyzer, wherein connection information of each device connected to one IEEE 1394 bus is stored in a connection information memory in correspondence with a node ID. Memory control means for storing, in a device information memory for all connected devices, a device directly connected to one device and information as to whether or not the device has a device identification number for each node ID; A group of directly connected devices consisting only of physical layer integrated circuits having no device identification number is determined as one group, and a group ID is assigned to the group.
A device information determining unit for storing D in the group information memory; and a group stored in the group information memory when displaying a connection diagram of devices connected to one IEEE 1394 bus on the display unit based on the connection information. And a display control means for displaying the data as a single device.