Datasheet

Datasheet, Volume 2 61
Processor Integrated I/O (IIO) Configuration Registers
3.3.4.18 DEVSTS—PCI Express* Device Status Register
The PCI Express Device Status register provides information about PCI Express device
specific parameters associated with the device.
Register: DEVSTS
Device: 0 (DMI), 3,5 (PCIe)
Function: 0
Offset: 9Ah
Bit Attr Default Description
15:6 RV 000h Reserved
5RO 0h
Transactions Pending
Does not apply to root/DMI ports, that is, bit hardwired to 0 for these
devices.
4RO 0Reserved
3 RW1C 0
Unsupported Request Detected
This bit applies only to the root/DMI ports.This bit indicates that the root
port detected an Unsupported Request. Errors are logged in this register
regardless of whether error reporting is enabled or not in the Device Control
Register.
0 = No unsupported request detected by the root port.
1 = Unsupported Request detected at the device/port. These unsupported
requests are NP requests inbound that the root port received and it
detected them as unsupported requests (for example, address decoding
failures that the root port detected on a packet, receiving inbound lock
reads, BME bit is clear, and so forth). Note that this bit is not set on
peer-to-peer completions with UR status that are forwarded by the root
port to the PCI Express link.
2 RW1C 0
Fatal Error Detected
This bit indicates that a fatal (uncorrectable) error is detected by the device.
Errors are logged in this register regardless of whether error reporting is
enabled or not in the Device Control register.
0 = No Fatal errors detected.
1 = Fatal errors detected.
1 RW1C 0
Non Fatal Error Detected
This bit gets set if a non-fatal uncorrectable error is detected by the device.
Errors are logged in this register regardless of whether error reporting is
enabled or not in the Device Control register.
0 = No Fatal errors detected.
1 = Fatal errors detected.
0 RW1C 0
Correctable Error Detected
This bit gets set if a correctable error is detected by the device. Errors are
logged in this register regardless of whether error reporting is enabled or not
in the PCI Express Device Control register.
0 = No Fatal errors detected.
1 = Fatal errors detected.