PCI Bridge
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor 9-51
Figure 9-39. Subclass Code Register
9.11.2.8 PCI Bus Base Class Code Register
Figure 9-40 and Table9-27 describe the PCI bus class code register.
Figure 9-40. PCI Bus Base Class Code Register
NOTE: I2O Compliancy
When configured as a PCI agent device, the value of the Interface, Subc lass
Code, and Base Class Code Registers are 0x01, 0x00, and 0x0E
respectively, indicating that the PowerQUICC II supports the I2O protocol.
The user should note that the I2O support is not fully standard compliant.
9.11.2.9 PCI Bus Cache Line Size Register
Figure 9-41 and Table9-28 describe the PCI bus cache line size register.
7 0
Field SC
Reset 0000_0000
R/W R
Addr 0x0A
Table9-26. Subclass Code Register Description
Bits Name Description
7–0 Subclass code Identifies more specifically the function of the PCI bridge (0x00 = host bridge)
7 0
Field BCC
Reset Refer to Table 9- 27.
R/W R
Addr 0x0B
Table9-27. PCI Bus Base Class Code Register Description
Bits Name Description
7–0 Base class code 0x06 When the PCI bridge is configured as a host bridge to indicate “Host Bridge”.
0x0E When the PCI bridge is configured as a target device to indicate the device
is an agent and is I2O capable.