AMD Geode™ SC2200 Processor Data Book 73
Signal Definitions 32580B
AVSSPLL3 AK3 GND PLL3 Analog Ground Connection.
VPLL2 A17 PWR 3.3V PLL2 Analog Power Connection. Low noise power for PLL2 and
PLL5.
VPLL3 AJ4 PWR 3.3V PLL3 Analog Power Connection. Low noise power for PLL3,
PLL4, and PLL6.
AVCCUSB D27 PWR 3.3V Analog USB Power Connection. Low noise power.
AVSSUSB C27 GND Analog USB Ground Connection.
AVCCCRT A12, C13, D15 PWR 3.3V Analog CRT DAC Power Connections. Low noise power.
AVSSCRT B14, C14, C15 GND Analog CRT DAC Ground Connections. Return
current.
VCCCRT D12 PWR 1.8V / 2.1V CRT DAC Digital Power Connection. Can be directly con-
nected to VCORE on PCB (printed circuit board).
VSSCRT C12 GND CRT DAC Digital Ground Connection. Can be directly connected to VSS
on PCB.
VBAT AL3 PWR Battery. Provides battery back-up to the RTC and ACPI registers, when
VSB 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 VBAT to VSS
VSB 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.
VSBL 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 VSS. This supply must be present when VSB is
present.
VCORE See Table 3-3
on page 41.
(Total of 28)
PWR 1.8V / 2.1V Core Processor Power Connections.
VIO See Table 3-3
on page 41.
(Total of 43)
PWR 3.3V I/O Power Connections.
VSS 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 VBAT must be connected, even if the function is not used.
3.4.20 Power, Ground and No Connections1 (Continued)
Signal Name Ball No. Type Description