32579B

Signal Definitions

 

 

3.4.21Power 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

 

 

 

VSB 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 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

See Table 3-3

PWR

1.8V Core Processor Power Connections.

 

on page 40

 

 

 

(Total of 28)

 

 

 

 

 

 

VIO

See Table 3-3

PWR

3.3V I/O Power Connections.

 

on page 40

 

 

 

(Total of 42)

 

 

 

 

 

 

VSS

See Table 3-3

GND

Ground Connections.

 

on page 40

 

 

 

(Total of 91)

 

 

 

 

 

 

1.All power sources except VBAT must be connected, even if the function is not used.

70

AMD Geode™ SC1200/SC1201 Processor Data Book

Page 70
Image 70
AMD SC1200, SC1201 manual Power and Ground Connections1