4−6
Table 4−4. Status Register Description (continued)
BIT SIGNAL TYPE FUNCTION
4 CAPLIST R Capabilities list. This bit returns 1 when read. This bit indicates that capabilities in addition to standard PCI
capabilities are implemented. The linked list of PCI power-management capabilities is implemented in this
function.
3 INT_STATUS RU Interrupt status. This bit reflects the interrupt status of the function. Only when bit 10 (INT_DISABLE) in the
command register (PCI offset 04h, see Section 4.4) is a 0 and this bit is a 1, is the function’s INTx signal
asserted. Setting the INT_DISABLE bit to a 1 has no effect on the state of this bit.
2−0 RSVD R Reserved. These bits return 0s when read.
4.6 Revision ID Register
The revision ID register indicates the silicon revision of the PCI7x21/PCI7x11 controller.
Bit 7 6 5 4 3 2 1 0
Name Revision ID
Type R R R R R R R R
Default 0 0 0 0 0 0 0 0
Register: Revision ID
Offset: 08h (functions 0, 1)
Type: Read-only
Default: 00h
4.7 Class Code Register
The class code register recognizes PCI7x21/PCI7x11 functions 0 and 1 as a bridge device (06h) and a CardBus
bridge device (07h), with a 00h programming interface.
Bit 23 22 21 20 19 18 17 16 15 14 13 12 11 109876543210
Name PCI class code
Base class Subclass Programming interface
Type RRRRRRRRRRRRRRRRRRRRRRRR
Default 000001100000011100000000
Register: PCI class code
Offset: 09h (functions 0, 1)
Type: Read-only
Default: 06 0700h
4.8 Cache Line Size Register
The cache line size register is programmed by host software to indicate the system cache line size.
Bit 7 6 5 4 3 2 1 0
Name Cache line size
Type RW RW RW RW RW RW RW RW
Default 0 0 0 0 0 0 0 0
Register: Cache line size
Offset: 0Ch (Functions 0, 1)
Type: Read/Write
Default: 00h