Datasheet

PCI Express Non-Transparent Bridge
Intel
®
Xeon
®
Processor C5500/C3500 Series
Datasheet, Volume 1 February 2010
288 Order Number: 323103-001
3.21.1.12 NTBCNTL: NTB Control
This register contains Control bits for the Non-transparent Bridge device.
Register:NTBCNTL
Bar:PB01BASE, SB01BASE
Offset:58h
Bit Attr Default Description
31:11 RO 00h Reserved
10 RW 0b
Crosslink SBDF Disable Increment
This bit is only valid in NTB/NTB mode
This bit determines if SBDF value on the DSD is incremented or not.
When = 0 the DSD will increment SBDF +1
When = 1 the DSD will leave the SBDF
09:08 RW 00b
BAR 4/5 Primary to Secondary Snoop Override Control
This bit controls the ability to force all transactions within the Primary BAR
4/5 window going from the Primary side to the Secondary side to be snoop/
no-snoop independent of the ATTR field in the TLP header.
00 - All TLP sent as defined by the ATTR field
01 - Force Snoop on all TLPs: ATTR field overridden to set the” No Snoop” bit
= 0 independent of the setting of the ATTR field of the received TLP.
10 - Force No-Snoop on all TLPs: ATTR field overridden to set the “No
Snoop” bit = 1 independent of the setting of the ATTR field of the received
TLP.
11 - Reserved
07:06
Bar: Attr
PB01BASE:
RW
else: RO
00b
BAR 4/5 Secondary to Primary Snoop Override Control
This bit controls the ability to force all transactions within the Secondary
BAR 4/5 window going from the Secondary side to the Primary side to be
snoop/no-snoop independent of the ATTR field in the TLP header.
00 - All TLP sent as defined by the ATTR field
01 - Force Snoop on all TLPs: ATTR field overridden to set the” No Snoop” bit
= 0 independent of the setting of the ATTR field of the received TLP.
10 - Force No-Snoop on all TLPs: ATTR field overridden to set the “No
Snoop” bit = 1 independent of the setting of the ATTR field of the received
TLP.
11 - Reserved
05:04 RW 00b
BAR 2/3 Primary to Secondary Snoop Override Control
This bit controls the ability to force all transactions within the Primary BAR
2/3 window going from the Primary side to the Secondary side to be snoop/
no-snoop independent of the ATTR field in the TLP header.
00 - All TLP sent as defined by the ATTR field
01 - Force Snoop on all TLPs: ATTR field overridden to set the” No Snoop” bit
= 0 independent of the setting of the ATTR field of the received TLP.
10 - Force No-Snoop on all TLPs: ATTR field overridden to set the “No
Snoop” bit = 1 independent of the setting of the ATTR field of the received
TLP.
11 - Reserved