82NM10 Datasheet, PDF (632/671 Pages) Intel Corporation – Intel® NM10 Family Express Chipset

PCI Express* Configuration Registers
19.1.23 XCAP—PCI Express* Capabilities Register
(PCI Express—D28:F0/F1/F2/F3)
Address Offset: 42h–43h
Default Value: 0041h
Attribute:
Size:
R/WO, RO
16 bits
Bit
Description
15:14 Reserved
13:9 Interrupt Message Number (IMN) — RO. The Chipset does not have multiple MSI
interrupt numbers.
8 Slot Implemented (SI) — R/WO. This field indicates whether the root port is
connected to a slot. Slot support is platform specific. BIOS programs this field, and it is
maintained until a platform reset.
7:4 Device / Port Type (DT) — RO. This field indicates this is a PCI Express* root port.
3:0 Capability Version (CV) — RO. This field indicates PCI Express 1.0.
19.1.24 DCAP—Device Capabilities Register
(PCI Express—D28:F0/F1/F2/F3)
Address Offset: 44h–47h
Default Value: 00000FE0h
Attribute:
Size:
RO
32 bits
Bit
Description
31:28 Reserved
27:26 Captured Slot Power Limit Scale (CSPS) — RO. Not supported.
25:18 Captured Slot Power Limit Value (CSPV) — RO. Not supported.
17:15 Reserved
14 Power Indicator Present (PIP) — RO. This bit indicates no power indicator is
present on the root port.
13 Attention Indicator Present (AIP) — RO. This bit indicates no attention indicator is
present on the root port.
12 Attention Button Present (ABP) — RO. This bit indicates no attention button is
present on the root port.
11:9 Endpoint L1 Acceptable Latency (E1AL) — RO. This field indicates more than 4 µs.
This field essentially has no meaning for root ports since root ports are not endpoints.
8:6 Endpoint L0 Acceptable Latency (E0AL) — RO. This field indicates more than 64 µs.
This field essentially has no meaning for root ports since root ports are not endpoints.
5 Extended Tag Field Supported (ETFS) — RO. This bit indicates that 8-bit tag fields
are supported.
4:3 Phantom Functions Supported (PFS) — RO. This field indicates No phantom
functions supported.
2:0 Max Payload Size Supported (MPS) — RO. This field indicates the maximum
payload size supported is 128B.
632
Datasheet