TWI829378B - Universal serial bus control device and control method therefore - Google Patents

Abstract

A universal serial bus (USB) control device and a control method therefore are provided. The USB control device includes a plurality of host interfaces, a plurality of USB ports, a bus physical layer circuit, a microprocessor, and a bus schedule controller. The bus schedule controller controls the bus physical layer circuit according to a USB task. The microprocessor obtains a USB task command by the host interface, and the USB task command includes a USB port number of a specific host interface. The microprocessor searches the USB port number of the specific host interface based on the index lookup table to obtain a specific USB port, generates the USB task according to the specific USB port, and transmits the USB task to the bus schedule controller. The index lookup table is configured to record relationship between a part of the USB ports that each host interface is responsible for and the USB port numbers.

Description

Universal serial bus control device and control method thereof

The present invention relates to a computer technology using a universal serial bus (USB), and in particular to a universal serial bus control device and a control method thereof.

Currently, the most commonly used connection interface in computer peripheral devices is the USB interface. From small mobile devices to large workstations, USB interfaces are still used. Devices using the USB interface (hereinafter referred to as USB devices) have various types and application characteristics. For example, display screens, high-definition cameras, and speakers have high bandwidth transmission requirements; some devices (such as face recognition cameras, fingerprint scanners, etc.) Scanning devices, flash drives) have information security requirements; general-purpose human-computer input devices (such as keyboards, mice, etc.), fans, mobile power supplies, etc. have no special types and application characteristics. Since there are too many types of USB devices, it is difficult to classify USB devices, and thus it is difficult to manage these USB devices.

Therefore, how to classify and manage these USB devices and maintain the flexible use function of USB itself is the research on the practical application of USB device management technology. trend.

The present invention provides a universal serial bus control device and a control method thereof, which enables the USB control device to manage multiple types of USB devices through multiple host interfaces, and allows all USB ports in the USB control device to still have flexible use functions.

The universal serial bus (USB) control device according to the embodiment of the present invention includes multiple host interfaces, multiple universal serial bus (USB) ports, bus physical layer circuits, a microprocessor, and a bus schedule controller. The bus physical layer circuit is coupled to the USB port. The microprocessor is coupled to the host interface. The bus schedule controller is coupled to the host interface, the microprocessor and the bus physical layer circuit. The bus schedule controller controls the bus physical layer circuit according to at least one USB task. The microprocessor obtains a USB task command through the host interface, and the USB task command includes a USB port number of a specific host interface, wherein the specific host interface is one of the host interfaces. The microprocessor queries the USB port number of the specific host interface based on an index lookup table to determine whether it corresponds to a specific USB port, generates the at least one USB task based on the specific USB port, and transfers the at least one USB task to the specific USB port. USB tasks are passed to the bus schedule controller. The specific USB port is one of the USB ports, and the index lookup table is used to record the relationship between a part of the USB port that each host interface is responsible for and the USB port number.

A control method for a universal serial bus control device according to an embodiment of the present invention includes the following steps: obtaining a USB task command through multiple host interfaces, where the USB task command includes a USB port number of a specific host interface, wherein The specific host interface is one of the host interfaces; the USB port number of the specific host interface is queried based on an index lookup table to correspond to a specific USB port, and the at least one is generated based on the specific USB port. A USB task, wherein the specific USB port is one of the USB ports, and the index lookup table is used to record the portion of the bus connection port that each host interface is responsible for and the USB port number. The relationship between; and, completing the at least one USB task through a bus schedule controller and a bus physical layer circuit.

Based on the above, the universal serial bus control device and its control method according to the embodiments of the present invention set multiple host interfaces in the USB control device, and use index lookup tables to configure and share some hardware components, thereby utilizing multiple judgment mechanisms Classify and manage multiple types of USB devices, and ensure that all USB ports in the USB control device still have flexible usage functions.

11: Host controller driver

100: Universal Serial Bus (USB) Control Device

110-1, 110-2: Host interface

120:Microprocessor

125:Firmware

130: Bus schedule controller

140: Index lookup table

145:Bus physical layer circuit

150-1: Low speed (LS)/full speed (FS) bus device

150-2: High speed (HS) bus device

150-3: Super high speed (SS) bus device

160:Port routing hub

170-1~170-N: USB port

210: virtual frame

S310~S350: steps

PPN: first column

HID: second column

HPN: The third column

FIG. 1 is a block diagram of a universal serial bus (USB) control device 100 according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of the index lookup table 140 in this embodiment.

Figure 3 is a diagram for a universal serial bus according to an embodiment of the present invention. A flowchart of a control method of the (USB) control device 100.

Since USB devices have become very popular and widely used in various applications, how to classify and manage USB devices according to their categories or application characteristics is an implementation trend. However, if the USB control device wishes to manage the USB device by detecting a specified category, it needs to use the judgment mechanism and hardware corresponding to the category. This kind of judgment mechanism often needs to be formulated separately. Currently, there is no unified judgment mechanism to classify and manage USB devices.

For example, according to the bandwidth requirements, USB display devices or USB audio devices with high frequency bandwidth requirements and USB keyboards or mice with low frequency bandwidth requirements are classified and managed; according to the information security control level, USB faces with high information security control levels are classified and managed. Identify cameras, fingerprint scanning devices or flash drives and general USB devices with general information security control levels (such as USB fans, mobile power supplies, etc.) for classified management. The USB control device can use the host interface identifier (ID) of the USB device as a specific type of judgment mechanism to facilitate management of the USB device and allocate physical resources, and each judgment mechanism requires corresponding hardware execution.

If you want a USB control device to manage these USB devices in multiple categories or application characteristics, in addition to multiple sets of judgment mechanisms and hardware, you also need to divide these USB ports for different uses. For example, if a computer device has ten USB ports and the USB control device 100 hopes to detect two special purposes (high-speed transmission purpose and high information security purpose), it is convenient when designing the computer device. It may be necessary to allocate four USB ports among the ten USB ports to USB devices for high-speed transmission purposes, and the other six USB ports among the ten USB ports may be allocated to USB devices for high-level information security purposes. As a result, the flexible use function originally provided by the USB port is lost.

Therefore, the embodiment of the present invention uses multiple host controller interfaces in the USB control device, and uses an index lookup table to enable these host interfaces to configure and share other hardware components, so that multiple judgment mechanisms can be used to classify and manage these USBs. device, so that all USB ports in the USB control device still have flexible use functions.

FIG. 1 is a block diagram of a universal serial bus (USB) control device 100 according to an embodiment of the present invention. The USB control device 100 of this embodiment is a USB-compliant extensible host controller interface (eXtensible Host Controller Interface; xHCI) as its control interface. The USB control device 100 may also be called a USB xHCI control device. The USB control device 100 of this embodiment is controlled by a host controller driver (eXtensible Host Controller driver; xHCD) 11.

The USB control device 100 can support the bus/device/function (BDF) of the PCI interface as the host interface identifier (ID) of USB devices to classify these USB devices. That is to say, embodiments consistent with the present invention can use the bus/device/function (BDF) of the PCI interface as the host interface identifier (ID) of the USB device, and the USB control device 100 can detect each The host interface identifier corresponding to a USB device is used to determine whether the characteristics of the USB device are for special purposes (for example, whether it is a high-speed transmission purpose, a high-level information security purpose, etc.) or a general purpose.

The USB control device 100 of this embodiment includes multiple host interfaces, a microprocessor 120, a bus schedule controller 130, a bus physical layer circuit 145 and multiple USB ports 170-1~170-N (N is greater than 1 positive integer). The bus physical layer circuit 145 of this embodiment may include bus devices based on different transmission speeds and a port routing hub 160 . Firmware 125 may be stored in the microprocessor 120 .

This embodiment takes two host interfaces 110-1~110-2 as an example. Those who apply this embodiment can adjust the number of host interfaces according to their needs. The host interfaces 110-1~110-2 may include hardware interface control circuits having xHCI definitions and operating according to this xHCI to communicate with the extensible host controller driver (xHCD) 11. xHCD 11 is controlled by the operating system in the memory device, so xHCD 11 can also be called an operating system host driver.

For example, when the computer device equipped with the USB control device 100 needs to access a USB device connected to a certain USB port, the xHCD 11 will pass the USB task command to the host interfaces 110-1~110-2. The host interfaces 110-1~110-2 can obtain respective USB task instructions from the xHCD 11 respectively. These USB task instructions mainly consist of one of the USB ports 170-1~170-N and a USB task corresponding to the aforementioned single USB port. The USB task may be data access or corresponding operation instructions with the USB device connected to the corresponding USB port.

The microprocessor 120 can implement embodiments of the present invention by running firmware stored therein. The microprocessor 120 in the embodiment of the present invention obtains the USB tasks corresponding to the aforementioned USB ports through the host interfaces 110-1~110-2 respectively, and transfers the USB tasks to According to the characteristics of the USB task command, it is assigned and passed to the bus schedule controller 130 according to the definition of the USB specification.

In this embodiment, bus devices based on different transmission speeds may include a Low Speed (LS)/Full Speed (FS) bus device 150-1 for USB 1.1 (which can be referred to as a first speed bus device), a High Speed (HS) bus device 150-2 for USB 2.0 (which can be called a second speed bus device), and a Super High Speed (SS) for USB 3.0 Bus device 150-3 (which may be referred to as a third rate bus device). In other words, the bus devices 150-1 to 150-3 are physical layer hardware devices or circuits used to handle transmission rates respectively defined in the USB protocol.

The bus schedule controller 130 controls the bus physical layer circuit 145 according to the requirements of the USB task command to perform corresponding processing on the packets of the corresponding USB bus. Specifically, the bus schedule controller 130 controls the port routing hub 160 and the bus devices 150-1~150-3 based on the USB tasks scheduled by the microprocessor 120, so that the corresponding USB ports 170-1~170 One of -N is connected to one of the bus devices 150-1~150-3, and controls one of the connected bus devices 150-1~150-3 to communicate with the aforementioned USB port 170-1~170- One of the connected USB devices accesses data to complete the USB task. For example, when the USB device connected to the USB port 170-1 only supports the USB 1.1 transfer rate, when the xHCD 11 wants to access data from the USB device, the bus scheduler controller 130 will control the port routing. The hub 160 connects the USB port 170-1 to the bus device 150-1 that supports the USB 1.1 transmission rate, thereby completing the communication between the xHCD 11 and the USB device. USB task to access data. When the USB device connected to the USB port 170-2 can support the USB 3.0 transfer rate, when the xHCD 11 wants to access data from the USB device, the bus schedule controller 130 will control the port routing hub 160 to The USB port 170-3 is connected to the bus device 150-3 that supports the USB 3.0 transmission rate, thereby completing the USB task of data access by the xHCD 11 and the USB device.

The bus schedule controller 130 performs corresponding processing on the packets corresponding to the USB bus according to the requirements of the USB task command. If there is a need to use or access system memory (eg, double data rate (DDR) synchronous dynamic random access memory (SDRAM) in a memory device), the bus scheduler controller 130 will The host interface identifier corresponding to the USB device related to the access operation is brought into the transaction of accessing the memory, and the port routing hub 160 is controlled based on the foregoing process to allow the corresponding USB ports 170-1~170- One of N is connected to one of the bus devices 150-1~150-3, and controls one of the connected bus devices 150-1~150-3 to communicate with the aforementioned USB port 170-1~170-N One of the connected USB devices accesses data to complete USB tasks.

When the host interfaces 110-1~110-2 all use the same judgment mechanism, the purpose corresponding to the USB device (for example: high-speed transmission or high information security requirements) can only be unique. However, if the host interface 110-1 and the host interface 110-2 use different judgment mechanisms, each judgment mechanism will correspond to the respective host interface identifier for different purposes, and these judgment mechanisms are for the same host interface identifier. The controlled USB device may be inconsistent with the purpose defined by the host interface identifier, thus causing confusion. For example, when hosts are defined for different purposes When the interface identifiers have the same value, the host interfaces 110-1 and 110-2 will be confused by the host interface identifiers with the same value, making it impossible to know what purpose the host interface identifier is defined for.

In order to avoid the aforementioned problems, the embodiment of the present invention establishes an index lookup table 140. This index lookup table 140 is used to record each host interface 110-1~110-2 and the USB interfaces responsible for these host interfaces 110-1~110-2. The relationship between the ports allows the microprocessor 120 to know the USB ports that each host interface 110-1~110-2 is responsible for based on the content in the index lookup table 140, and execute USB tasks through the corresponding host interface. In other words, the index lookup table of this embodiment can record the USB port responsible for each host interface, and the xHCD 11 can modify the data in the index lookup table through instructions, so that there is no need to physically and inflexibly assign a specific multiplexer. A USB port is assigned to a specific host interface, but the USB device connected to a certain USB port can be flexibly changed from one host interface to another host interface by modifying the data in the index lookup table, and in the aforementioned modification There is no need for the user to plug the USB device from one USB port to another.

In this embodiment, the index lookup table 140 is set up in the bus schedule controller 130. Users of this embodiment can adjust the location of the index lookup table 140 according to their needs. For example, the index lookup table 140 can be set up in the microprocessor. 120 or another memory component (not shown), so that the components that need to be used (such as the microprocessor 120, the host interface 110-1~110-2, the bus schedule controller 130..., etc.) can Just access it.

FIG. 2 is a schematic diagram of the index lookup table 140 in this embodiment. The field PPN (also called the first field) of the index lookup table 140 is used to represent the number of the USB port. The field HID (also called the second field) is used to represent the host interface identifier corresponding to the host interface responsible for the aforementioned USB port, and the field HPN (also called the third field) is used to represent the host interface identifier. Responsible USB port number.

It is assumed here that the number of USB ports in Figure 1 is 6 (ie, N=6), and they are presented as USB ports 170-1~170-6 in the index lookup table 140, so the USB port 170-170 is listed in the field PPN. 1~170-6. The host interface identifier of the host interface 110-1 in Figure 1 is "Bus0 Dev3 Func0" and is represented as "000300" in the field HID of the index lookup table 140; the host interface identifier of the host interface 110-2 in Figure 1 is "Bus0" Dev4 Func0" and appears as "000400" in the field HID of the index lookup table 140. The host interface 110-1 is responsible for the USB tasks of USB ports 170-1, 170-3, and 170-5, so the fields corresponding to the fields PPN "170-1", "170-3", and "170-5" The HIDs of all bits are "000300", and the field HPNs corresponding to the fields PPN "170-1", "170-3", and "170-5" are "01", "02", and "03" respectively. Use It means that the USB port number "01" in the host interface 110-1 is USB port 170-1, the USB port number "02" is USB port 170-3, and the USB port number "03" is USB port 170. -5. By analogy, the field HID corresponding to the fields PPN "170-2", "170-4", and "170-6" are all "000400" representing the host interface 110-2, and the host interface 110-2 The USB port number "01" is USB port 170-2, the USB port number "02" is USB port 170-4, and the USB port number "03" is USB port 170-6.

The index lookup table 140 can be established when the computer device is powered on by the microprocessor 120 running its firmware 125 . On the other hand, since USB technology supports hot plugging, and when the computer device is shut down, the connection relationship of the USB device may be compromised. Therefore, the index lookup table 140 can also be dynamically created by the microprocessor 120 through preset attributes when running its firmware, or the xHCD 11 can create the index lookup table 140 according to the classification required for management.

For example, the attributes that are classified and managed can be classified by performance attributes or safety attributes. In other words, the foregoing judgment mechanism for classification can be set or implemented by system vendors or manufacturers for flexible planning. Those who apply this example do not limit the application method of the foregoing judgment mechanism for classification management. For example, the host interface identifier "Bus0 Dev3 Func0" can be set to high performance, and the host interface identifier "Bus0 Dev4 Func0" can be set to normal performance; or the host interface identifier "Bus0 Dev3 Func0" can be set to high security. The host interface identifier "Bus0 Dev4 Func0" is set to low security or normal security. For example, a computer device that implements an input-output memory management unit (IOMMU) or a system memory management unit (SMMU) can be configured with different host interface identifiers (or bus/device/function (BDF) of the PCI interface). )) to achieve the function of attribute characteristics. For example, IOMMU or SMMU can determine system security access permissions based on different host interface identifiers; for example, a low-security host interface identifier will not allow access to an area where high-security data is stored, so different The host interface identifier to issue access transactions is the basic component to achieve classification attribute characteristics.

Referring to Figure 2, it is assumed here that the host interface 110-1 is used to process high-security tasks, and the host interface 110-2 is used to process low-security or general security tasks. When a high-security USB device (such as a fingerprint scanner) is connected to the USB port At 170-2, the xHCD 11 recognizes that the fingerprint scanner is configured to be connected to the host interface 110-2 for handling low security or normal security tasks. Therefore, xHCD 11 activates the modification command of the index lookup table 140, and as shown in the dotted box 210 in Figure 2, the field HID and the field HPN of the field PPN "170-2" are changed from the original "000400", "01 ” is changed to “000300” and “04”, which is equivalent to removing the fingerprint scanner from the USB port number “01” of the host interface 110-2 and then inserting it into the USB port number “04” of the host interface 110-1. To allow the fingerprint scanner to be controlled by the host interface 110-1. Therefore, the xHCD 11 can restart the USB control device 100 to recognize the fingerprint scanner, and successfully complete the relevant functions of the actual operation because the security has met the required conditions.

On the other hand, when the computer device is preparing to shut down, the USB processing device 110 may store the currently configured index lookup table 140 into a non-volatile memory device of the computer device (eg, Basic Input Output System (BIOS), specific hardware disc interval...etc.). When the computer device is turned on next time, if a valid index lookup table 140 is found in the basic input and output system (BIOS) or a specific hard disk area, the USB processing device 110 of this embodiment can directly store the aforementioned non-volatile memory. The content in the device is directly loaded into the index lookup table 140 for use by the USB processing device 110 . Therefore, the embodiment of the present invention provides for modifying the index lookup table 140 in the form of software modification, which can maintain the flexibility in use of the USB port.

FIG. 3 is a flow chart of a control method for a universal serial bus (USB) control device 100 according to an embodiment of the present invention. The method described in Figure 3 can be implemented by the microprocessor 120 in the USB control device 100 in Figure 1, or, Figure 3 The method described may be implemented by firmware executed in the microprocessor 120 . In step S310, the index lookup table may be initialized by the microprocessor 120 or the xHCD 11 through the microprocessor 120. As mentioned above, when the computer device equipped with the USB control device 100 is turned on or the USB device is connected to the USB control device 100 through the USB ports 170-1~170-N, the microprocessor 120 can determine the required classification management according to the mechanism. Set the required index lookup table 140 or initialize the index lookup table 140 by loading pre-stored content in the BIOS.

In step S320, the microprocessor 120 receives the USB task command through the host interface 110-1~110-2. This embodiment assumes that the USB task command includes a USB task with USB port number "02" issued by the host interface 110-1 (referred to as a specific host interface in this embodiment). In other words, xHCD 11 sends a USB task command to the host interface 110-1, and the microprocessor 120 receives the USB task sent by the host interface 110-1 and having a USB port number corresponding to the host interface through the host interface 110-1. The specific host interface is one of the host interfaces 110-1~110-2.

In step S330, the microprocessor 120 queries the USB port number ("02") of the specific host interface (host interface 110-1) based on the index lookup table 140 to determine whether it corresponds to the specific USB port, and generates at least one USB port based on the specific USB port. USB tasks. Specifically, the microprocessor 120 queries the data in the third column through the index lookup table 140 based on the host interface identifier "000300" and the USB port number "02" corresponding to the host interface 110-1, thereby querying the data corresponding to the aforementioned information and located at The USB port 170-3 of the PPN in field 140 of the index lookup table is used as the aforementioned specific USB port. Moreover, the microprocessor 120 executes the USB task command based on the specific USB port (USB port 170-3). It is required to generate at least one USB task. The specific USB port in this embodiment is one of the USB ports 170-1~170-N. The index lookup table 140 is used to record the relationship between a part of the USB port that each host interface 110-1~110-2 is responsible for and the USB port number. For example, it can be seen from the index lookup table 140 that the host interface identifier (field HID) is "000300" and the USB number (corresponding field HPN) is "02" and the corresponding field PPN is "170-3".

In step S340, the microprocessor 120 passes the USB task of the USB port 170-3 to the bus schedule controller 130 according to the characteristics of the USB task command and the definition of the USB specification, so that the bus schedule controller 130 and bus physical layer circuit 145 to complete the aforementioned USB tasks.

In step S350, the bus schedule controller 130 completes the corresponding USB task and generates a USB packet according to the requirements of the USB task command. This USB packet is sent back to xHCD 11 for data access with the USB device. When executing a USB task corresponding to a specific USB port (e.g., USB port 170-3), if there is a need to issue a double data rate (DDR) synchronization dynamic using or accessing system memory (e.g., a memory device) random access memory (SDRAM), the index lookup table 140 will be used to determine which host interface identifier corresponding to the host interface 110-1~110-2 is used to bring the transaction to access the system memory. , and complete the USB task based on the aforementioned process.

Based on the foregoing steps and operations, the embodiment of the present invention can use the index lookup table 140 to realize the integration of other hardware components (such as the microprocessor 120, the bus schedule controller 130, the bus devices 150-1~150 in Figure 1 -3. Port routing hub 160 and USB ports 170-1~170-N...etc.) are shared to multiple host interfaces (e.g., host interfaces 110-1~110-2 in Figure 1), and multiple judgment mechanisms can be used to classify and manage these USB devices. For example, Different host interfaces correspond to different judgment mechanisms, and all USB ports in the USB control device still have flexible use functions.

If security is used as an example of the judgment mechanism, the operating system on the computer device can be programmed in the settings of the IOMMU. All transactions in the host interface 110-2 in Figure 1 (its host interface identifier is "000400") can only access larger A low-security or normal-security memory address block. Therefore, if a low-security USB device violates security principles and wishes to use a high-security address block, the IOMMU will issue an access denial result. Therefore, after the xHCD 11 identifies the device type of the USB device connected to one of the USB ports 170-1~170-N on the USB control device 100, it will allocate a memory block that complies with its security principles to operate this device. USB device to complete settings consistent with its security.

To sum up, the universal serial bus control device and its control method according to the embodiments of the present invention set multiple host interfaces in the USB control device, and use the index lookup table to configure and share some hardware components, thereby utilizing a variety of The judgment mechanism classifies and manages multiple types of USB devices, and enables all USB ports in the USB control device to still have flexible usage functions.

11: Host controller driver

100: Universal Serial Bus (USB) Control Device

110-1, 110-2: Host interface

120:Microprocessor

125:Firmware

130: Bus schedule controller

140: Index lookup table

145:Bus physical layer circuit

150-1: Low speed (LS)/full speed (FS) bus device

150-2: High speed (HS) bus device

150-3: Super high speed (SS) bus device

160:Port routing hub

170-1~170-N: USB port

Claims (11)

A universal serial bus (USB) control device includes: multiple host interfaces; multiple universal serial bus (USB) ports; a microprocessor coupled to the host interface; and a bus schedule controller, The host interface and the microprocessor are coupled, wherein the microprocessor obtains a USB task command through the host interface, the USB task command includes a USB port number of a specific host interface, wherein the specific The host interface is one of the host interfaces. The microprocessor queries the USB port number of the specific host interface based on an index lookup table to determine whether it corresponds to a specific USB port, and generates at least one based on the specific USB port. a USB task, and transfer the at least one USB task to the bus schedule controller, wherein the specific USB port is one of the USB ports, and the index lookup table is used to record each host The relationship between the part of the USB port that the interface is responsible for and the USB port number, the universal serial bus control device further includes: a bus physical layer circuit coupled to the USB port, wherein the The bus schedule controller controls the bus physical layer circuit according to the at least one USB task, wherein the bus physical layer circuit includes: a plurality of bus devices, each bus device is used to pass a different USB a transfer rate for communicating with a USB device, wherein the USB device is coupled to the universal serial bus control device through one of the USB ports; and a port routing hub is coupled to the USB port and the bus A bus device is used to electrically connect one or more of the USB ports to one of the bus devices under the control of the bus schedule controller. The universal sequence bus control device as claimed in claim 1, wherein the bus schedule controller stores the index lookup table. The universal sequence bus control device as claimed in claim 1, wherein the microprocessor receives a modification instruction regarding the index lookup table to modify the data in the index lookup table. The universal serial bus control device as claimed in claim 1, wherein the universal serial bus control device is controlled by a host controller driver and coupled to the host interface to provide the USB task command to the host interface. , or used to provide a modification instruction regarding the index lookup table to the microprocessor. The universal sequence bus control device as claimed in claim 1, wherein the microprocessor is also used to initialize the index lookup table. The universal serial bus control device according to claim 1, wherein the index lookup table includes a plurality of fields, and the fields include: a first field to indicate that the USB port is located in the universal serial bus control device. a local number of the bus control device; a second field used to represent the host interface identifier corresponding to the host interface; and A third field used to indicate the USB port number corresponding to the host interface. The universal serial bus control device as claimed in claim 1, wherein the bus device includes: a first speed bus device for communicating with the USB device according to a first speed; a second speed bus device, for communicating with the USB device according to a second rate; and a third rate bus device for communicating with the USB device according to a third rate, wherein the first rate, the second rate and the The third rates are different from each other. A control method for a universal serial bus control device, including: obtaining a USB task command through multiple host interfaces, the USB task command including a USB port number of a specific host interface, wherein the specific host interface is the One of the host interfaces; query the USB port number of the specific host interface based on an index lookup table to correspond to a specific USB port, and generate at least one USB task based on the specific USB port, wherein the specific A USB port is one of the USB ports, and the index lookup table is used to record the relationship between the part of the USB port that each host interface is responsible for and the USB port number; through the universal sequence A bus schedule controller in a bus control device Complete the at least one USB task, wherein the universal serial bus control device further includes a bus physical layer circuit, the bus physical layer circuit is coupled to the USB port, and the bus schedule controller Control the bus physical layer circuit according to the at least one USB task, wherein the bus physical layer circuit includes: a plurality of bus devices, each bus device is used to communicate with a USB through different USB transmission rates Device communication, wherein the USB device is coupled to the universal serial bus control device through one of the USB ports; and a port routing hub is coupled to the USB port and the bus device for One or more of the USB ports are electrically connected to one of the bus devices under control of the bus schedule controller. The control method as described in claim 8 further includes: receiving a modification instruction regarding the index lookup table to modify the data in the index lookup table. The control method according to claim 8, wherein the index lookup table includes a plurality of fields, and the fields include: a first field to indicate that the USB port is located in the universal serial bus control device a local number; a second field used to represent the host interface identifier corresponding to the host interface; and a third field used to represent the USB port number corresponding to the host interface No. The control method as described in claim 8 further includes: initializing the index lookup table.

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