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70 AMD Geode™ SC1200/SC1201 Processor Data Book
Signal Definitions
32579B
3.4.21 Power and Ground Connections
1
Signal Name Ball No. Type Description
AV
SSPLL2
C16 GND Analog PLL2 Ground Connection.
AV
SSPLL3
AK3 GND Analog PLL3 Ground Connection.
V
PLL2
A17 PWR 3.3V PLL2 Analog Power Connection. Low noise power for PLL2 and
PLL5.
V
PLL3
AJ4 PWR 3.3V PLL3 Analog Power Connection. Low noise power for PLL3,
PLL4, and PLL6.
AV
CCUSB
D27 PWR 3.3V Analog USB Power Connection. Low noise power for USB.
AV
SSUSB
C27 GND Analog USB Ground Connection.
AV
CCCRT
A12, C13, D15 PWR 3.3V Analog CRT DAC Power Connections. Low noise power.
AV
SSCRT
B14, C14, C15 GND Analog CRT DAC Ground Connections. Return
current.
V
CCCRT
D12 PWR 1.8V CRT DAC Digital Power Connection. Can be directly connected to
V
CORE
on PCB (printed circuit board).
V
SSCRT
C12 GND CRT DAC Digital Ground Connection. Can be directly connected to V
SS
on PCB.
AV
CCTV
D23 PWR 3.3V Analog TV DAC Power Connection. Low noise power.
AV
SSTV
B24 GND Analog TV DAC Ground Connection. Return current.
V
BAT
AL3 PWR Battery. Provides battery back-up to the RTC and ACPI registers, when
V
SB
is lower than the minimum value (see Table 9-3 on page 366). The
ball is connected to the internal logic through a series resistor for UL pro-
tection. If battery backup is not desired, connect V
BAT
to V
SS
.
V
SB
AL5 PWR 3.3V Standby Power Supply. Provides power to the Real-Time Clock
(RTC) and ACPI circuitry while the main power supply is turned off.
V
SBL
AL6 PWR 1.8V Standby Power Supply. Provides power to the internal logic while
the main power supply is turned off. This signal requires a 0.1 μF bypass
capacitor to V
SS
. This supply must be present when V
SB
is present.
V
CORE
See Table 3-3
on page 40
(Total of 28)
PWR 1.8V Core Processor Power Connections.
V
IO
See Table 3-3
on page 40
(Total of 42)
PWR 3.3V I/O Power Connections.
V
SS
See Table 3-3
on page 40
(Total of 91)
GND Ground Connections.
1. All power sources except V
BAT
must be connected, even if the function is not used.