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5.2 Intel ICH6-M South Bridge(9)
Power and Ground Signals
Name Description
Vcc3_3
3.3 V supply for core well I/O buffers (22 pins). This power may be shut off in S3,
S4, S5 or G3 states.
Vcc1_5_A
1.5 V supply for core well logic, group A (52 pins). This power may be shut off in
S3, S4, S5 or G3 states.
Vcc1_5_B
1.5 V supply for core well logic, group B (45 pins). This power may be shut off in
S3, S4, S5 or G3 states.
Vcc2_5
2.5V supply for internal logic (2 pins). This power may be shut off in S3, S4, S5 or
G3 states.
NOTE: This voltage may be generated internally (see Section 2.22.1 for strapping
option). If generated internally, these pins should not be connected to an external
supply.
V5REF
Reference for 5 V tolerance on core well inputs (2 pins). This power may be shut
off in S3, S4, S5 or G3 states.
VccSus3_3
3.3 V supply for resume well I/O buffers (20 pins). This power is not expected to
be shut off unless the system is unplugged.
VccSus1_5
1.5 V supply for resume well logic (3 pin). This power is not expected to be shut
off unless the system is unplugged.
This voltage may be generated internally (see Section 2.22.1 for strapping option).
If generated internally, these pins should not be connected to an external supply.
V5REF_Sus
Reference for 5 V tolerance on resume well inputs (1 pin). This power is not
expected to be shut off unless the system is unplugged.
VccRTC
3.3 V (can drop to 2.0 V min. in G3 state) supply for the RTC well (1 pin). 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 in an ICH6-based platform can be done by
using a jumper on RTCRST# or GPI.
VccUSBPLL
1.5 V supply for core well logic (1 pin). This signal is used for the USB PLL. This
power may be shut off in S3, S4, S5 or G3 states. This signal must be powered
even if USB not used.
VccDMIPLL
1.5 V supply for core well logic (1 pins). This signal is used for the DMI PLL. This
power may be shut off in S3, S4, S5 or G3 states.
VccSATAPLL
1.5 V supply for core well logic (1 pins). This signal is used for the SATA PLL.
This power may be shut off in S3, S4, S5 or G3 states. This signal must be
powered even if SATA not used.
V_CPU_IO
Powered by the same supply as the processor I/O voltage (3 pins). This supply is
used to drive the processor interface signals listed in Table 2-13.
Vss
Grounds (172 pins).
AC ’97/Intel ® High Definition Audio Link Signals
NOTES:
1. Some signals have integrated pull-ups or pull-downs. Consult table in Section 3.1 for
details.
2. Intel High Definition Audio mode is selected through D30:F1:40h, bit 0: AZ/AC97#. This
bit selects the mode of the shared Intel High Definition Audio/AC ‘97 signals. When set to 0
AC ’97 mode is selected. When set to 1 Intel High Definition Audio mode is selected. The bit
defaults to 0 (AC ‘97 mode).
Name Type Description
ACZ_RST#
O AC ’97/Intel ® High Definition Audio Reset: Master hardware reset
to external codec(s).
ACZ_SYNC
O AC ’97/Intel High Definition Audio Sync: 48 kHz fixed rate sample
sync to the codec(s). Also used to encode the stream number.
ACZ_BIT_CLK
I/O AC ’97 Bit Clock Input: 12.288 MHz serial data clock generated by
the external codec(s). This signal has an integrated pull-down resistor
(see Note below).
Intel High Definition Audio Bit Clock Output: 24.000 MHz serial
data clock generated by the Intel® High Definition Audio controller
(the Intel ICH6). Thissignal has an integrated pull-down resistor so
that ACZ_BIT_CLK does not float when an
Intel High Definition Audio codec (or no codec) is connected but the
signals are temporarily configured as AC ’97.
ACZ_SDOUT
O AC ’97/Intel High Definition Audio Serial Data Out: Serial TDM
data output to the codec(s). This serial output is double-pumped for a
bit rate of 48 Mb/s for Intel High Definition Audio.
NOTE: ACZ_SDOUT is sampled at the rising edge of PWROK as a
functional strap. See Section 2.22.1 for more details. There is a weak
integrated pull-down resistor on the ACZ_SDOUT pin.
ACZ_SDIN[2:0]
I AC ’97/Intel High Definition Audio Serial Data In [2:0]: Serial
TDM data inputs from the three codecs. The serial input is
single-pumped for a bit rate of 24 Mb/s for Intel High Definition
Audio. These signals have integrated pull-down resistors, which are
always enabled.
Firmware Hub Interface Signals
Name Type Description
FWH[3:0] /
LAD[3:0]
I/O Firmware Hub Signals. These signals are multiplexed with the LPC
address signals.
FWH[4]
/
LFRAME#
O
Firmware Hub Signals.
This signal is multiplexed with the LPC
LFRAME# signal.
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