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AMD Geode™ SC2200 Processor Data Book 73
Signal Definitions
32580B
AV
SSPLL3
AK3 GND PLL3 Analog 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.
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 / 2.1V CRT DAC Digital Power Connection. Can be directly con-
nected 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.
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 370). 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 / 2.1V 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 41.
(Total of 28)
PWR 1.8V / 2.1V Core Processor Power Connections.
V
IO
See Table 3-3
on page 41.
(Total of 43)
PWR 3.3V I/O Power Connections.
V
SS
See Table 3-3
on page 41.
(Total of 92)
GND Ground Connections.
NC See Table 3-3
on page 41.
(Total of 8)
--- No Connections. These lines should be left disconnected. Connecting a
pull-up/-down resistor or to an active signal could cause unexpected
results and possible malfunctions.
1. All power sources except V
BAT
must be connected, even if the function is not used.
3.4.20 Power, Ground and No Connections
1
(Continued)
Signal Name Ball No. Type Description