前言
PCIe配置空间（PCIE Configuration Space）中的类型码（Class Code），记录了PCIe类型设备的类型、子类型和功能，不同的PCIe设备，根据其类型和功能，有不同的类型码、子类型码和功能码。
PCIe配置空间
Class Code
| Class Code | The upper byte (at offset 0Bh) is a base class code which broadly classifies the type of function the device performs |
| The middle byte (at offset 0Ah) is a sub-class code which identifies more specifically the function of the device | |
| The lower byte (at offset 09h) identifies a specific register-level programming interface (if any) so that device independent software can interact with the device |
Class Code（类型码）, Subclass（子类型码）, 和Prog IF寄存器分别用于标识设备的类型、设备的功能和设备的寄存器级编程接口。下表列出了可能的设备类型：
| Class Code | Description |
|---|---|
| 0x00 | Device was built prior definition of the class code field |
| 0x01 | Mass Storage Controller |
| 0x02 | Network Controller |
| 0x03 | Display Controller |
| 0x04 | Multimedia Controller |
| 0x05 | Memory Controller |
| 0x06 | Bridge Device |
| 0x07 | Simple Communication Controllers |
| 0x08 | Base System Peripherals |
| 0x09 | Input Devices |
| 0x0A | Docking Stations |
| 0x0B | Processors |
| 0x0C | Serial Bus Controllers |
| 0x0D | Wireless Controllers |
| 0x0E | Intelligent I/O Controllers |
| 0x0F | Satellite Communication Controllers |
| 0x10 | Encryption/Decryption Controllers |
| 0x11 | Data Acquisition and Signal Processing Controllers |
| 0x12 ~ 0xFE | Reserved |
| 0xFF | Device does not fit any defined class. |
下表列出了PCI(e)可能的设备功能：
| Class Code (offset 0x0B) | Sub-class (offset 0x0A) | ProgIF (offset 0x09) | Description |
|---|---|---|---|
| 0x00 | 0x00 | 0x00 | Any device except for VGA-Compatible devices |
| 0x01 | 0x00 | VGA-Compatible Device | |
| 0x01 | 0x00 | 0x00 | SCSI Bus Controller |
| 0x01 | 0x– | IDE Controller | |
| 0x02 | 0x00 | Floppy Disk Controller | |
| 0x03 | 0x00 | IPI Bus Controller | |
| 0x04 | 0x00 | RAID Controller | |
| 0x05 | 0x20 | ATA Controller (Single DMA) | |
| 0x30 | ATA Controller (Chained DMA) | ||
| 0x06 | 0x00 | Serial ATA (Vendor Specific Interface) | |
| 0x01 | Serial ATA (AHCI 1.0) | ||
| 0x07 | 0x00 | Serial Attached SCSI (SAS) | |
| 0x80 | 0x00 | Other Mass Storage Controller | |
| 0x02 | 0x00 | 0x00 | Ethernet Controller |
| 0x01 | 0x00 | Token Ring Controller | |
| 0x02 | 0x00 | FDDI Controller | |
| 0x03 | 0x00 | ATM Controller | |
| 0x04 | 0x00 | ISDN Controller | |
| 0x05 | 0x00 | WorldFip Controller | |
| 0x06 | 0x– | PICMG 2.14 Multi Computing | |
| 0x80 | 0x00 | Other Network Controller | |
| 0x03 | 0x00 | 0x00 | VGA-Compatible Controller |
| 0x01 | 8512-Compatible Controller | ||
| 0x01 | 0x00 | XGA Controller | |
| 0x02 | 0x00 | 3D Controller (Not VGA-Compatible) | |
| 0x80 | 0x00 | Other Display Controller | |
| 0x04 | 0x00 | 0x00 | Video Device |
| 0x01 | 0x00 | Audio Device | |
| 0x02 | 0x00 | Computer Telephony Device | |
| 0x03 | 0x00 | Multimedia Device | |
| 0x05 | 0x00 | 0x00 | RAM Controller |
| 0x01 | 0x00 | Flash Controller | |
| 0x80 | 0x00 | Other Memory Controller | |
| 0x06 | 0x00 | 0x00 | Host Bridge |
| 0x01 | 0x00 | ISA Bridge | |
| 0x02 | 0x00 | EISA Bridge | |
| 0x03 | 0x00 | MCA Bridge | |
| 0x04 | 0x00 | PCI-to-PCI Bridge | |
| 0x01 | PCI-to-PCI Bridge (Subtractive Decode) | ||
| 0x05 | 0x00 | PCMCIA Bridge | |
| 0x06 | 0x00 | NuBus Bridge | |
| 0x07 | 0x00 | CardBus Bridge | |
| 0x08 | 0x– | RACEway Bridge | |
| 0x09 | 0x40 | PCI-to-PCI Bridge (Semi-Transparent, Primary) | |
| 0x80 | PCI-to-PCI Bridge (Semi-Transparent, Secondary) | ||
| 0x0A | 0x00 | InfiniBrand-to-PCI Host Bridge | |
| 0x80 | 0x00 | Other Bridge Device | |
| 0x07 | 0x00 | 0x00 | Generic XT-Compatible Serial Controller |
| 0x01 | 16450-Compatible Serial Controller | ||
| 0x02 | 16550-Compatible Serial Controller | ||
| 0x03 | 16650-Compatible Serial Controller | ||
| 0x04 | 16750-Compatible Serial Controller | ||
| 0x05 | 16850-Compatible Serial Controller | ||
| 0x06 | 16950-Compatible Serial Controller | ||
| 0x01 | 0x00 | Parallel Port | |
| 0x01 | Bi-Directional Parallel Port | ||
| 0x02 | ECP 1.X Compliant Parallel Port | ||
| 0x03 | IEEE 1284 Controller | ||
| 0xFE | IEEE 1284 Target Device | ||
| 0x02 | 0x00 | Multiport Serial Controller | |
| 0x03 | 0x00 | Generic Modem | |
| 0x01 | Hayes Compatible Modem (16450-Compatible Interface) | ||
| 0x02 | Hayes Compatible Modem (16550-Compatible Interface) | ||
| 0x03 | Hayes Compatible Modem (16650-Compatible Interface) | ||
| 0x04 | Hayes Compatible Modem (16750-Compatible Interface) | ||
| 0x04 | 0x00 | IEEE 488.1/2 (GPIB) Controller | |
| 0x05 | 0x00 | Smart Card | |
| 0x80 | 0x00 | Other Communications Device | |
| 0x08 | 0x00 | 0x00 | Generic 8259 PIC |
| 0x01 | ISA PIC | ||
| 0x02 | EISA PIC | ||
| 0x10 | I/O APIC Interrupt Controller | ||
| 0x20 | I/O(x) APIC Interrupt Controller | ||
| 0x01 | 0x00 | Generic 8237 DMA Controller | |
| 0x01 | ISA DMA Controller | ||
| 0x02 | EISA DMA Controller | ||
| 0x02 | 0x00 | Generic 8254 System Timer | |
| 0x01 | ISA System Timer | ||
| 0x02 | EISA System Timer | ||
| 0x03 | 0x00 | Generic RTC Controller | |
| 0x01 | ISA RTC Controller | ||
| 0x04 | 0x00 | Generic PCI Hot-Plug Controller | |
| 0x80 | 0x00 | Other System Peripheral | |
| 0x09 | 0x00 | 0x00 | Keyboard Controller |
| 0x01 | 0x00 | Digitizer | |
| 0x02 | 0x00 | Mouse Controller | |
| 0x03 | 0x00 | Scanner Controller | |
| 0x04 | 0x00 | Gameport Controller (Generic) | |
| 0x10 | Gameport Contrlller (Legacy) | ||
| 0x80 | 0x00 | Other Input Controller | |
| 0x0A | 0x00 | 0x00 | Generic Docking Station |
| 0x80 | 0x00 | Other Docking Station | |
| 0x0B | 0x00 | 0x00 | 386 Processor |
| 0x01 | 0x00 | 486 Processor | |
| 0x02 | 0x00 | Pentium Processor | |
| 0x10 | 0x00 | Alpha Processor | |
| 0x20 | 0x00 | PowerPC Processor | |
| 0x30 | 0x00 | MIPS Processor | |
| 0x40 | 0x00 | Co-Processor | |
| 0x0C | 0x00 | 0x00 | IEEE 1394 Controller (FireWire) |
| 0x10 | IEEE 1394 Controller (1394 OpenHCI Spec) | ||
| 0x01 | 0x00 | ACCESS.bus | |
| 0x02 | 0x00 | SSA | |
| 0x03 | 0x00 | USB (Universal Host Controller Spec) | |
| 0x10 | USB (Open Host Controller Spec) | ||
| 0x20 | USB2 Host Controller (Intel Enhanced Host Controller Interface) | ||
| 0x30 | USB3 XHCI Controller | ||
| 0x80 | Unspecified USB Controller | ||
| 0xFE | USB (Not Host Controller) |
||
| 0x04 | 0x00 | Fibre Channel | |
| 0x05 | 0x00 | SMBus | |
| 0x06 | 0x00 | InfiniBand | |
| 0x07 | 0x00 | IPMI SMIC Interface | |
| 0x01 | IPMI Kybd Controller Style Interface | ||
| 0x02 | IPMI Block Transfer Interface | ||
| 0x08 | 0x00 | SERCOS Interface Standard (IEC 61491) | |
| 0x09 | 0x00 | CANbus | |
| 0x0D | 0x00 | 0x00 | iRDA Compatible Controller |
| 0x01 | 0x00 | Consumer IR Controller | |
| 0x10 | 0x00 | RF Controller | |
| 0x11 | 0x00 | Bluetooth Controller | |
| 0x12 | 0x00 | Broadband Controller | |
| 0x20 | 0x00 | Ethernet Controller (802.11a) | |
| 0x21 | 0x00 | Ethernet Controller (802.11b) | |
| 0x80 | 0x00 | Other Wireless Controller | |
| 0x0E | 0x00 | 0x– | I20 Architecture |
| 0x00 | Message FIFO | ||
| 0x0F | 0x01 | 0x00 | TV Controller |
| 0x02 | 0x00 | Audio Controller | |
| 0x03 | 0x00 | Voice Controller | |
| 0x04 | 0x00 | Data Controller | |
| 0x10 | 0x00 | 0x00 | Network and Computing Encrpytion/Decryption |
| 0x10 | 0x00 | Entertainment Encryption/Decryption | |
| 0x80 | 0x00 | Other Encryption/Decryption | |
| 0x11 | 0x00 | 0x00 | DPIO Modules |
| 0x01 | 0x00 | Performance Counters | |
| 0x10 | 0x00 | Communications Syncrhonization Plus Time and Frequency Test/Measurment | |
| 0x20 | 0x00 | Management Card | |
| 0x80 | 0x00 | Other Data Acquisition/Signal Processing Controller |
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