
70
AMD Geode SC1200/SC1201 Processor Data Book
Signal Definitions
32579B
3.4.21
Power and Ground Connections1
Signal Name
Ball No.
Type
Description
AVSSPLL2
C16
GND
Analog PLL2 Ground Connection.
AVSSPLL3
AK3
GND
Analog PLL3 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 for USB.
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 CRT DAC Digital Power Connection. Can be directly connected to
VCORE on PCB (printed circuit board).
VSSCRT
C12
GND
CRT DAC Digital Ground Connection. Can be directly connected to VSS
on PCB.
AVCCTV
D23
PWR
3.3V Analog TV DAC Power Connection. Low noise power.
AVSSTV
B24
GND
Analog TV DAC Ground Connection. Return current.
VBAT
AL3
PWR
Battery. Provides battery back-up to the RTC and ACPI registers, when
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 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
(Total of 28)
PWR
1.8V Core Processor Power Connections.
VIO
(Total of 42)
PWR
3.3V I/O Power Connections.
VSS
(Total of 91)
GND
Ground Connections.
1.
All power sources except VBAT must be connected, even if the function is not used.