PCI Configuration Space Registers (Type 0 / Type 1)

PCI Configuration Space Type 0 is for PCI devices and, for Endpoints in case of PCIe. Type 1 Config Space is for PCI host controller and, for PCI Root Complex in case of PCIe.

Type 0/1 Configuration Space:

FIG: Config Space.

• The Config Space registers are common for both type 0/1.
• Device ID and Vendor ID: Identify the particular device.
• Status register: Provides error information, updated information, etc.
• Command register: Controls Bus Master and different utilities.
• Class code: Provides category of the device (Host Controller, IDE Bridge, SATA Controller, Ethernet Controller, etc).
• Revision ID of PCI.
• BIST - Built-In Self Test.
• Header Type Specific area is defined by Header type (0 or 1).
• Cache Line Size.

Table: Configuration Space Registers.

Table: Command Register

Table: Status Register

FIG: Type 0 Configuration Space

Table: TYPE 0 Registers

FIG: PCIe TYPE 1 Configuration Space

Table: TYPE 1 Configuration Space Registers