CN209911965U - Cluster type development board system - Google Patents
Cluster type development board system Download PDFInfo
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- CN209911965U CN209911965U CN201920607983.3U CN201920607983U CN209911965U CN 209911965 U CN209911965 U CN 209911965U CN 201920607983 U CN201920607983 U CN 201920607983U CN 209911965 U CN209911965 U CN 209911965U
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Abstract
The embodiment of the utility model provides a cluster type development board system, this system includes: the system comprises a main board, remote user equipment and a plurality of development boards inserted on the main board; the mainboard comprises a management unit and a communication unit; the development board, the management unit and the remote user equipment realize communication interconnection of two devices through the communication unit; the management unit is used for receiving a development board use request of the remote user equipment and distributing a development board in an idle state to the remote user equipment; the development board is used for operating the user design file according to the use requirement of the remote user equipment and returning an operation result to the remote user equipment. The embodiment of the utility model provides a cluster type development board system through placing polylith development board is concentrated, adopts the online mode to distribute the development board according to the user demand, and the centralized management of the development board of being convenient for has reduced the spoilage, increases operation rate to can collect the development board and use statistical data.
Description
Technical Field
The utility model relates to the field of communication technology, concretely relates to cluster type development board system.
Background
The development board is a circuit board formed by modules such as a processing chip, an interface circuit, a power supply and the like. For example, the FPGA development board is a circuit board formed by modules such as an FPGA chip, an interface circuit, a power supply and the like, and is a necessary experimental device for related experiments of the FPGA. When the existing development board is used, a user needs to switch on a power supply and connect a download line to a computer, for example, the user design is downloaded to the FPGA by the computer, and relevant experiments are performed. Typically, the user must physically touch the development board during the experiment.
Taking a teaching scene as an example, when the existing development board product is applied to a teaching experiment scene, a board must be handed to students, and the students operate the development board. Therefore, students are required to complete experiments such as FPGA in a laboratory, or the students are allowed to take away the development board. Generally, the design on development boards such as an FPGA is complex, the debugging period is long, and students are required to be unrealistic in a laboratory all the time, and only the students are allowed to take the boards away from the laboratory, and the boards are returned after the experiment is finished. The result of this is a low utilization of the development board and a high number of damages.
SUMMERY OF THE UTILITY MODEL
For solving the problem in the use of current development board, the embodiment of the utility model provides a cluster type development board system.
The embodiment of the utility model provides a cluster type development board system, include: the system comprises a main board, remote user equipment and a plurality of development boards inserted on the main board; the mainboard comprises a management unit and a communication unit; the development board, the management unit and the remote user equipment realize communication interconnection of two devices through the communication unit; the management unit is used for receiving a development board use request of the remote user equipment and distributing a development board in an idle state to the remote user equipment; the development board is used for operating the user design file according to the use requirement of the remote user equipment and returning an operation result to the remote user equipment.
Further, the main board also comprises a power supply; the mainboard is provided with a preset number of edge connector slots for inserting the development board; the development board connects the power supply and the communication unit through the edge connector slot.
Further, the management unit is also used for detecting the use state of each development board and displaying the use state through a preset indicator lamp.
Further, the communication unit includes a switch unit and an ethernet unit; the development board and the management unit are both connected with the Ethernet unit through the switch unit; the remote user equipment is connected to the ethernet unit.
Further, the development board comprises a processing chip and a control unit, wherein the processing chip is connected with the control unit; the control unit is used for writing a logic circuit into the processing chip according to the use requirement, setting an input signal waveform, measuring an output signal waveform and returning the operation result to the remote user equipment; wherein the operation result includes the output signal waveform.
Further, the control unit is further configured to perform development board function self-test on the development board, and report a self-test result to the management unit.
Furthermore, the development board also comprises a power converter, and the power converter is connected with the processing chip and the control unit; the power converter is used for reducing the voltage of an externally input power supply and then supplying power to the processing chip and the control unit.
Furthermore, the development board further comprises a processing chip peripheral circuit, and the processing chip peripheral circuit is respectively connected with the processing chip, the control unit and the power converter.
Further, the development board further comprises an edge connector, and the edge connector is connected with the power converter and the control unit; the development board is inserted into the edge connector slot of the mainboard through the edge connector.
Further, the main board and the plurality of development boards inserted on the main board are arranged in the chassis.
The embodiment of the utility model provides a cluster type development board system through placing polylith development board is concentrated, adopts the online mode to distribute the development board according to the user demand, and the centralized management of the development board of being convenient for has reduced the spoilage, increases operation rate to can collect the development board and use statistical data.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a cluster development board system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a cluster development board system according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a development board of the cluster development board system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an internal structure of a chassis of a cluster development board system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a development board of a cluster development board system according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Fig. 1 is a schematic structural diagram of a cluster development board system according to an embodiment of the present invention. As shown in fig. 1, the system includes: the system comprises a main board 1, remote user equipment 2 and a plurality of development boards 3 inserted on the main board 1; the main board 1 comprises a management unit 4 and a communication unit 5; the development board 3, the management unit 4 and the remote user equipment 2 realize communication interconnection with each other through the communication unit 5; the management unit 4 is configured to receive a development board use request of the remote user equipment 2, and allocate the development board 3 in an idle state to the remote user equipment 2; the development board 3 is configured to run a user design file according to a usage requirement of the remote user equipment 2, and return a running result to the remote user equipment 2.
The cluster development board system comprises a main board 1, remote user equipment 2 and a plurality of development boards 3 inserted on the main board 1; the development board 3 is inserted on the main board 1 to realize communication and mechanical fixation. The main board 1 includes a management unit 4 and a communication unit 5. The development board 3, the management unit 4 and the remote user equipment 2 realize communication interconnection with each other through the communication unit 5; that is, the development board 3, the management unit 4 and the remote user equipment 2 are all connected to the communication unit 5, so that two-to-two communication between the development board 3 and the management unit 4, between the development board 3 and the remote user equipment 2, and between the management unit 4 and the remote user equipment 2 can be realized.
The management unit 4 is configured to receive a development board usage request of the remote user device 2, and allocate the development board 3 in an idle state to the remote user device 2. The management unit 4 is responsible for managing user connections and allocating free development boards 3. The management unit 4 receives the development board use request of the remote user equipment 2, and then judges whether an idle development board 3 exists, if so, one idle development board 3 is selected to be allocated to the remote user equipment 2 for use. If no idle development board 3 exists, the remote user equipment 2 is informed to wait, the development board use request can be placed in a waiting queue, and after the idle development board 3 exists, the idle development board 3 is distributed to the remote user equipment 2 according to the sequence of the waiting queue.
After allocating an idle development board 3 to a remote user equipment 2, the management unit 4 may send an ID number of the allocated idle development board 3 to the remote user equipment 2, so that the remote user equipment 2 establishes a connection with the corresponding idle development board 3; or directly forwarding a development board use request of the remote user equipment 2 to the allocated idle development board 3, so that the idle development board 3 is connected with the remote user equipment 2; of course, other ways of establishing the connection of the allocated free development board 3 and the remote user equipment 2 are also possible.
The development board 3 allocated to the remote user equipment 2 is configured to run a user design file according to a usage requirement of the remote user equipment 2, and return a running result to the remote user equipment 2. After the remote user equipment 2 is connected with the development board 3 allocated to the remote user equipment, the use requirement is sent to the development board 3, and the use requirement comprises an input signal waveform. It is to be understood that the information of the use requirement may be directly included in the development board use request. The development board 3 runs the user design file according to the use requirement of the remote user equipment 2, and returns the running result to the remote user equipment 2.
Therefore, the development boards are placed in a centralized manner, so that centralized management is facilitated, including replacement of damaged boards and the like; students do not need to physically contact the development board or take the board away from a laboratory, so that the damage rate is reduced; the development board is not bound to people any more, can be distributed during use and released after use, so that the utilization rate is improved; the condition that the student used the development board can be monitored at any time, statistical data is collected.
The embodiment of the utility model provides a through placing polylith development board is concentrated, adopt online mode according to user demand distribution development board, the centralized management of the development board of being convenient for has reduced the spoilage, increases operation rate to can collect the development board and use statistical data.
Fig. 2 is a schematic structural diagram of a cluster development board system according to another embodiment of the present invention. As shown in fig. 2, the main board 1 further includes a power supply 6; the main board 1 is provided with a preset number of edge connector slots for inserting the development board 3; the development board 3 connects the power supply 6 and the communication unit 5 through the edge connector slot.
The main board 1 further comprises a power supply 6 for supplying power to the main board 1 and each development board 3 inserted on the main board 1. The main board 1 is provided with a preset number of edge connector slots for inserting the development board 3. The motherboard 1 has a plurality of edge connector slots similar to DIMM memory bank slots for insertion of the development board 3. The edge connector slot has a plurality of contacts therein, including connections for power, communication signals, etc. The development board 3 is connected with the power supply 6 and the communication unit 5 through the edge connector slot, so that power and communication access is realized.
On the basis of the above-mentioned embodiment, the embodiment of the utility model provides an insert the development board through the edge connector slot to pass through edge connector slot connection power and communication unit with the development board, realized development board power supply and external communication with simple structure.
Further, based on the above embodiment, the management unit 4 is further configured to detect the use status of each development board 3, and display the use status through a preset indicator light 7.
The management unit 4 is further configured to detect a use state of each of the development boards 3, and allocate the development board 3 in an idle state to the development board 3. The management unit can also be connected with the indicator lamps 7 which are arranged in one-to-one correspondence with the development boards 3, and the use states of the development boards 3 are displayed through the indicator lamps 7, so that managers can know the use states of the development boards. The use state comprises use and non-use, and can also comprise a fault state.
On the basis of the above-mentioned embodiment, the embodiment of the utility model provides a through the user state who detects each development board to show user state through predetermined pilot lamp, the effective management of the development board of being convenient for.
Further, based on the above-described embodiment, as shown in fig. 2, the communication unit 5 includes a switch unit 8 and an ethernet unit 9; the development board 3 and the management unit 4 are both connected with the ethernet unit 9 through the switch unit 8; the remote user equipment 2 is connected to the ethernet unit 9.
The communication unit 5 comprises a switch unit 8 and an ethernet unit 9; the development board 3 and the management unit 4 are both connected with the ethernet unit 9 through the switch unit 8; the remote user equipment 2 is connected to the ethernet unit 9. The switch unit 8 achieves the purpose of data exchange among the unit modules. The development board 3, the management unit 4 and the remote user equipment 2 realize communication through ethernet.
On the basis of the above-mentioned embodiment, the embodiment of the utility model provides a through the ethernet communication between switch unit realization development board, management unit and the remote user equipment, improved the reliability of communication.
Fig. 3 is a schematic structural diagram of a development board of the cluster development board system according to an embodiment of the present invention. As shown in fig. 3, the development board 3 includes a processing chip 31 and a control unit 32, and the processing chip 31 is connected to the control unit 32; the control unit 32 is configured to write a logic circuit into the processing chip 31 according to the usage requirement, set an input signal waveform, measure an output signal waveform, and return the operation result to the remote user equipment 2; wherein the operation result includes the output signal waveform.
The control unit 32 is connected to the management unit 4 on the main board 1, and the control unit 32 is connected to the remote user device 2, so that communication between the control unit 32 and the management unit 4 and communication between the remote user device 2 can be realized.
Similar to existing development boards, the processing chip 31 on the development board 3 is open to the user for programming. The user can write the logic circuit designed by the user into the processing chip 31 to perform the experiment. The control unit 32 may include an embedded processor, and runs a preset operating system, and the control unit 32 is configured to run a user design file according to the use requirement, that is, write a logic circuit into the processing chip 31, set an input signal waveform, and measure an output signal waveform; after the operation is finished, returning the operation result to the remote user equipment 2; the operation result includes the output signal waveform, and may also include other results obtained through testing.
The control unit 32 writes a user design (including a logic circuit) into the processing chip 31 according to a use requirement sent by the remote user equipment 2, sets an input signal of the processing chip 31, measures an output signal of the processing chip 31, communicates with the remote user equipment 2 (via ethernet), and sends a measured operation result such as the output signal of the processing chip 31 to the remote user equipment 2.
On the basis of the embodiment, the embodiment of the utility model provides a through set up the control unit in the development board, realized utilizing development board operation user design file and the return of operation result according to the user demand, realized the automation that the development board used.
Further, based on the above embodiment, the control unit 32 is further configured to perform a development board functional self-test on the development board 3, and report a self-test result to the management unit 4.
The control unit 32 is further configured to perform development board function self-inspection on the development board 3, where the development board function self-inspection includes, for example, processing chip function inspection, power state inspection, interface circuit line inspection, and reports a self-inspection result to the management unit 4.
On the basis of the above-mentioned embodiment, the embodiment of the utility model provides a through utilizing the control unit to develop board function self-checking, be convenient for in time discover the trouble, improved system reliability.
Further, based on the above embodiment, as shown in fig. 3, the development board further includes a power converter 33, and the power converter 33 is connected to the processing chip 31 and the control unit 32; the power converter 33 is configured to step down an externally input power and supply power to the processing chip 31 and the control unit 32.
The development board 3 further includes a power converter 33, and the power converter 33 is connected to the processing chip 31 and the control unit 32. The power converter 33 is configured to step down an externally input power and supply power to the processing chip 31, the control unit 32, and other circuits disposed on the development board 3. The power supply of the development board 3 can be obtained from the main board 1, that is, for the development board 3, the externally input power source can be the power source obtained from the main board 1.
On the basis of the embodiment, the embodiment of the utility model provides a for processing chip and the control unit power supply after stepping down with external input's power through utilizing power converter, guaranteed development board safe and reliable work.
Further, based on the above embodiment, the development board 3 further includes a processing chip peripheral circuit, and the processing chip peripheral circuit is respectively connected to the processing chip 31, the control unit 32, and the power converter 33.
The development board 3 can also optionally add peripheral circuits of processing chips, such as memory chips including RAM, Flash, etc., so as to support more experiment types. For example: an internal memory access experiment, a flash memory reading experiment, a flash memory programming experiment and the like.
On the basis of the embodiment, the embodiment of the utility model provides a through setting up processing chip peripheral circuit, provide more experiment types, richened the function of development board.
Further, based on the above-mentioned embodiment, as shown in fig. 3, the development board 3 further includes an edge connector 34, and the edge connector 34 is connected to the power converter 33 and the control unit 32; the development board 3 is inserted into an edge connector slot of the main board 1 through the edge connector 34.
Each development board 3 is a separate PCB, one edge of the PCB is an edge connector 34, and the edge connector 34 is connected with the power converter 33 and the control unit 32 for leading out the connection of the power converter 33 and the control unit 32. The development board 3 is inserted into the edge connector slot of the motherboard 1 through the edge connector 34, so that communication between the development board 3 and the motherboard 1 and power supply from the motherboard 1 to the development board 3 are realized.
Wherein, both the main board 1 and the development board 3 can support hot plug.
On the basis of the above-mentioned embodiment, the embodiment of the utility model provides a through set up edge connector at the development board, the communication interconnection and the power supply of development board have effectively been realized simply and conveniently to the edge connector slot on the cooperation mainboard.
Further, based on the above embodiment, the main board 1 and the plurality of development boards 3 inserted on the main board 1 are placed in a chassis.
The main board 1 and the plurality of development boards 3 inserted on the main board 1 are arranged in a case, and the front panel of the case can be provided with the indicator light 7 and a power indicator light for indicating power supply and the working state of each development board. The back panel of the case can be provided with an alternating current power supply input and an Ethernet interface to connect a power supply and a network.
On the basis of the above-mentioned embodiment, the embodiment of the utility model provides a through with the mainboard and insert a plurality of development boards of arranging on the mainboard in the case is convenient for effectively manage.
To further illustrate the cluster development board system provided by the present invention, an application example of the cluster FPGA development board system is given below.
Fig. 4 is a schematic diagram of an internal structure of a chassis of a cluster development board system according to an embodiment of the present invention. Fig. 5 is a schematic structural diagram of a development board of a cluster development board system according to another embodiment of the present invention. As shown in fig. 4 and 5:
the appearance of the case is similar to that of a rack server case, and the front panel is provided with an indicator light for indicating the power supply and the working state of each development board. The back panel has AC power input and Ethernet interface to connect power supply and network.
The chassis has a motherboard with a plurality of edge connector slots similar to DIMM memory bank slots for insertion of the development board. The socket has a plurality of contacts including power, ethernet signals, status indication signals, and other control signals. The development board communicates with the outside mainly through ethernet.
The main board is provided with a management unit which comprises a processor, and a Linux operating system and a control program are run on the management unit. The management unit is responsible for managing user connection, distributing idle development boards and detecting the states of the development boards. The management unit also communicates with other units via ethernet. The management unit can also output a state indicating signal which is connected to the front panel LED, so that an administrator can know the working state of each development board.
The main board is also provided with an Ethernet switch unit which is connected with all the development boards and is also connected with the management unit and the outside of the case. The purpose of data exchange among all the components is provided.
The edge connector on the mainboard can support hot plug, and when having the board to damage, the administrator can change the board under the circumstances of not cutting off the power supply.
Each development board is an independent PCB, one edge of the PCB is an edge connector (commonly called a golden finger) on which an experimental FPGA chip, a control unit, a power converter and other circuits necessary for supporting the operation of the chip are arranged. Similar to the existing FPGA development board, the experimental FPGA chip on the board is opened for programming the user. The user can write the logic circuit designed by the user into the FPGA chip to carry out experiments.
The control unit comprises an embedded processor, runs a Linux operating system and has the functions of: writing user design into the experimental FPGA, setting signals of each input interface of the experimental FPGA, measuring signals on an output interface of the experimental FPGA, communicating with a remote user (through an Ethernet interface), developing board function self-checking (such as FPGA function checking, power state checking, chip function checking support and the like), and reporting a self-checking result to a management unit. The user uses the experimental FPGA through the control unit, and typical procedures are as follows: the design of the device is written into an experimental FPGA, some input signal waveforms are set, and the output signal waveforms of the FPGA are measured.
The power converter is used for reducing the voltage of the power input by the edge connector to meet the requirements of the chip and then supplying the power to the experimental FPGA, the control unit and other circuits.
In addition, the board can be optionally added with storage chips such as RAM, Flash and the like, so that more experiment types are supported. For example: an internal memory access experiment, a flash memory reading experiment, a flash memory programming experiment and the like.
The embodiment of the utility model forms a cluster by a plurality of FPGA development boards and is placed in a case; compared with the existing product, each development board is additionally provided with a control unit for managing the development boards; the development board is inserted on the mainboard by adopting an edge connector to realize communication and mechanical fixation; RAM and Flash memory are optionally added on the development board for experiments; the main board comprises a power supply and a network switch, and can supply power to the development board and provide network interconnection; the main board is provided with a management unit for distributing an idle development board to users; the management unit can monitor the state of the development board and report the damaged board; the control unit is connected with the network and receives a user request; the control unit can write user design into the FPGA; the control unit can apply input signals given by a user to the experiment FPGA; the control unit can measure signals output by the experimental FPGA so as to facilitate a user to remotely observe experimental phenomena; the main board and the development board support hot plug.
The embodiment of the utility model provides a cluster type development board system places a quick-witted incasement with polylith FPGA development board to access internet. The students are remotely connected to the system through a network, and one development board is used for completing the experiment. As long as the number of online users does not exceed the number of boards, a plurality of people can use the system to complete the experiment at the same time.
The embodiment of the utility model provides a through placing polylith development board is concentrated, adopt online mode according to user demand distribution development board, the centralized management of the development board of being convenient for has reduced the spoilage, increases operation rate to can collect the development board and use statistical data.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A clustered development board system, comprising: the system comprises a main board, remote user equipment and a plurality of development boards inserted on the main board;
the mainboard comprises a management unit and a communication unit; the development board, the management unit and the remote user equipment realize communication interconnection of two devices through the communication unit;
the management unit is used for receiving a development board use request of the remote user equipment and distributing a development board in an idle state to the remote user equipment; the development board is used for operating the user design file according to the use requirement of the remote user equipment and returning an operation result to the remote user equipment.
2. The clustered development board system of claim 1, wherein the motherboard further comprises a power supply; the mainboard is provided with a preset number of edge connector slots for inserting the development board;
the development board connects the power supply and the communication unit through the edge connector slot.
3. The clustered development board system of claim 1, wherein the management unit is further configured to detect a usage status of each development board and display the usage status through a preset indicator light.
4. The clustered development board system of claim 1, wherein the communication unit comprises a switch unit and an ethernet unit; the development board and the management unit are both connected with the Ethernet unit through the switch unit;
the remote user equipment is connected to the ethernet unit.
5. The clustered development board system of claim 1, wherein the development board includes a processing chip and a control unit, the processing chip and the control unit being connected;
the control unit is used for writing a logic circuit into the processing chip according to the use requirement, setting an input signal waveform, measuring an output signal waveform and returning the operation result to the remote user equipment; wherein the operation result includes the output signal waveform.
6. The clustered development board system of claim 5, wherein the control unit is further configured to perform development board functional self-tests on the development boards and report the self-test results to the management unit.
7. The clustered development board system of claim 5, wherein the development board further comprises a power converter, the power converter being connected to the processing chip and the control unit;
the power converter is used for reducing the voltage of an externally input power supply and then supplying power to the processing chip and the control unit.
8. The clustered development board system of claim 7, wherein the development board further comprises a processing chip peripheral circuit, the processing chip peripheral circuit being connected with the processing chip, the control unit and the power converter, respectively.
9. The clustered development board system of claim 7, wherein the development board further comprises an edge connector, the edge connector being connected with the power converter and the control unit; the development board is inserted into the edge connector slot of the mainboard through the edge connector.
10. The clustered development board system of claim 1, wherein the main board and the plurality of development boards plugged onto the main board are disposed in a chassis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920607983.3U CN209911965U (en) | 2019-04-29 | 2019-04-29 | Cluster type development board system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920607983.3U CN209911965U (en) | 2019-04-29 | 2019-04-29 | Cluster type development board system |
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| CN209911965U true CN209911965U (en) | 2020-01-07 |
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| CN201920607983.3U Expired - Fee Related CN209911965U (en) | 2019-04-29 | 2019-04-29 | Cluster type development board system |
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| CN (1) | CN209911965U (en) |
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2019
- 2019-04-29 CN CN201920607983.3U patent/CN209911965U/en not_active Expired - Fee Related
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