HP A2Y15AV Manuale Utente

104

Datasheet, Volume 2

2

RW

0b

Uncore

ISA Enable (ISAEN)
Needed to exclude legacy resource decode to route ISA resources 

to legacy decode path. Modifies the response by the root port to 

an I/O access issued by the processor that target ISA I/O 

addresses. This applies only to I/O addresses that are enabled by 

the IOBASE and IOLIMIT registers. 
0 = All addresses defined by the IOBASE and IOLIMIT for 

processor I/O transactions will be mapped to PCI Express-G.

1 = The root port will not forward to PCI Express-G any I/O 

transactions addressing the last 768 bytes in each 1 KB 

block, even if the addresses are within the range defined by 

the IOBASE and IOLIMIT registers.

1

RW

0b

Uncore

SERR Enable (SERREN)
0 = No forwarding of error messages from secondary side to 

primary side that could result in an SERR.

1 = ERR_COR, ERR_NONFATAL, and ERR_FATAL messages result 

in SERR message when individually enabled by the Root 

Control register.

0

RW

0b

Uncore

Parity Error Response Enable (PEREN) 
This bit controls whether or not the Master Data Parity Error bit in 

the Secondary Status register is set when the root port receives 

across the link (upstream) a Read Data Completion Poisoned TLP.
0 = Master Data Parity Error bit in Secondary Status register can 

NOT be set. 

1 = Master Data Parity Error bit in Secondary Status register 

CAN be set.

31:27

RO

19h

Uncore

PME Support (PMES) 
This field indicates the power states in which this device may 

indicate PME wake using PCI Express messaging. D0, D3hot, and 

D3cold. This device is not required to do anything to support 

D3hot and D3cold; it simply must report that those states are 

supported. Refer to the PCI Power Management 1.1 specification 

for encoding explanation and other power management details.

26

RO

0b

Uncore

D2 Power State Support (D2PSS) 
Hardwired to 0 to indicate that the D2 power management state 

is NOT supported.

25

RO

0b

Uncore

D1 Power State Support (D1PSS) 
Hardwired to 0 to indicate that the D1 power management state 

is NOT supported.