Intel 6 SERIES CHIPSET - DATASHEET 01-2011 - Power and Ground Signals

Datasheet 85
Signal Description
2.26 Power and Ground Signals
Table 2-26. Power and Ground Signals (Sheet 1 of 2)
Name Description
DcpRTC
Decoupling: This signal is for RTC decoupling only. This signal requires
decoupling.
DcpSST
Decoupling: Internally generated 1.5 V powered off of Suspend Well. This
signal requires decoupling. Decoupling is required even if this feature is not
used.
DcpSus
1.05 V Suspend well power.
Internal VR mode (INTVRMEN sampled high): Well generated internally. Pins
should be left No Connect
External VR mode (INTVRMEN sampled low): Well supplied externally. Pins
should be powered by 1.05 Suspend power supply. Decoupling capacitors are
required.
NOTE: External VR mode applies to Mobile Only.
DcpSusByp
Internally generated 1.05 V Deep S4/S5 well power. This rail should not be
supplied externally.
NOTE: No decoupling capacitors should be used on this rail.
V5REF
Reference for 5 V tolerance on core well inputs. This power may be shut off in
S3, S4, S5 or G3 states.
V5REF_Sus
Reference for 5 V tolerance on suspend well inputs. This power is not
expected to be shut off unless the system is unplugged.
VccCore
1.05 V supply for core well logic. This power may be shut off in S3, S4, S5 or
G3 states.
Vcc3_3
3.3 V supply for core well I/O buffers. This power may be shut off in S3, S4,
S5 or G3 states.
VccASW
1.05 V supply for the Active Sleep Well. Provides power to the Intel
®
ME and
integrated LAN. This plane must be on in S0 and other times the Intel ME or
integrated LAN is used.
VccDMI
Power supply for DMI.
1.1 V or 1.05 V based on the processor used. Please refer to the respective
processor documentation to find the appropriate voltage level.
VccDIFFCLKN
1.05 V supply for Differential Clock Buffers. This power is supplied by the core
well.
VccRTC
3.3 V (can drop to 2.0 V min. in G3 state) supply for the RTC well. This power
is not expected to be shut off unless the RTC battery is removed or completely
drained.
NOTE: Implementations should not attempt to clear CMOS by using a jumper
to pull VccRTC low. Clearing CMOS can be done by using a jumper on
RTCRST# or GPI.
VccIO
1.05 V supply for core well I/O buffers. This power may be shut off in S3, S4,
S5 or G3 states.
VccSus3_3
3.3 V supply for suspend well I/O buffers. This power is not expected to be
shut off unless the system is unplugged.
VccSusHDA Suspend supply for Intel
®
HD Audio. This pin can be either 1.5 or 3.3 V.
VccVRM 1.5 V/1.8 V supply for internal PLL and VRMs