Intel 82925X, Datasheet

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Host-PCI Express* Graphics Bridge Registers (D1:F0)
R
136 Intel
®
82925X/82925XE MCH Datasheet
8.1.34 DCTL—Device Control (D1:F0)
PCI Device: 1
Address Offset: A8h
Default Value: 0000h
Access: R/W
Size: 16
bits
This register provides control for PCI Express device specific capabilities.
The error reporting enable bits are in reference to errors detected by this device, not error
messages received across the link. The reporting of error messages (ERR_CORR,
ERR_NONFATAL, ERR_FATAL) received by Root Port is controlled exclusively by Root Port
Command Register.
Bit Access &
Default
Description
15:8 Reserved
7:5 R/W
000b
Max Payload Size
000 = 128B maximum supported payload for Transaction Layer Packets (TLP).
As a receiver, the device must handle TLPs as large as the set value; as
transmitter, the device must not generate TLPs exceeding the set value.
Note: All other encodings are reserved.
4 Reserved
3 R/W
0b
Unsupported Request Reporting Enable:
0 = Disable.
1 = Enable. Unsupported Requests will be reported.
Note that reporting of error messages received by Root Port is controlled
exclusively by Root Control register.
2 R/W
0b
Fatal Error Reporting Enable:
0 = Disable.
1 = Enable. Fatal errors will be reported. For a Root Port, the reporting of fatal
errors is internal to the root. No external ERR_FATAL message is
generated.
1 R/W
0b
Non-Fatal Error Reporting Enable:
0 = Disable.
1 = Enable. Non-fatal errors will be reported. For a Root Port, the reporting of
non-fatal errors is internal to the root. No external ERR_NONFATAL
message is generated. Uncorrectable errors can result in degraded
performance.
0 R/W
0b
Correctable Error Reporting Enable:
0 = Disable.
1 = Enable. Correctable errors will be reported. For a Root Port, the reporting of
correctable errors is internal to the root. No external ERR_CORR message
is generated.