Host-PCI Express* Graphics Bridge Registers (D1:F0)
R
Intel
®
82925X/82925XE MCH Datasheet 113
8.1.3 PCICMD1—PCI Command (D1:F0)
PCI Device: 1
Address Offset: 04h
Default Value: 0000h
Access: RO, R/W
Size: 16 bits
Bit Access &
Default
Description
15:11 Reserved
10 R/W
0b
INTA Assertion Disable:
0 = This device is permitted to generate INTA interrupt messages.
1 = This device is prevented from generating interrupt messages.
Any INTA emulation interrupts already asserted must be de-asserted when this
bit is set.
Only affects interrupts generated by the device (PCI INTA from a PME or Hot
Plug event) controlled by this command register. It does not affect upstream
MSIs, upstream PCI INTA-INTD asserts and de-assert messages.
9 RO
0b
Fast Back-to-Back Enable (FB2B): Not Applicable or Implemented. Hardwired
to 0.
8 R/W
0b
SERR Message Enable (SERRE1): This bit is an enable bit for Device 1 SERR
messaging. The MCH communicates the SERRB condition by sending an SERR
message to the Intel
®
ICH6. This bit, when set, enables reporting of non-fatal and
fatal errors to the Root Complex. Note that errors are reported if enabled either
through this bit or through the PCI Express* specific bits in the Device Control
Register
0 = The SERR message is generated by the MCH for Device 1 only under
conditions enabled individually through the Device Control Register.
1 = The MCH is enabled to generate SERR messages which will be sent to the
ICH6 for specific Device 1 error conditions that are individually enabled in the
BCTRL1 register and for all non-fatal and fatal errors generated on the
primary side of the virtual PCI to PCI Express bridge (not those received by
the secondary side). The error status is reported in the PCISTS1 register.
7 Reserved
6 R/WO
0b
Parity Error Enable (PERRE): This bit controls whether or not the Master Data
Parity Error bit in the PCI Status register can bet set.
0 = Master Data Parity Error bit in PCI Status register cannot be set.
1 = Master Data Parity Error bit in PCI Status register can be set.
5 RO
0b
VGA Palette Snoop: Hardwired to 0.
4 RO
0b
Memory Write and Invalidate Enable (MWIE): Hardwired to 0.
3 RO
0b
Special Cycle Enable (SCE): Hardwired to 0.
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