Signal Definitions

32580B

3.4.20Power, Ground and No Connections1 (Continued)

Signal Name

Ball No.

Type

Description

 

 

 

 

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

PWR

1.8V / 2.1V Core Processor Power Connections.

 

on page 41.

 

 

 

(Total of 28)

 

 

 

 

 

 

VIO

See Table 3-3

PWR

3.3V I/O Power Connections.

 

on page 41.

 

 

 

(Total of 43)

 

 

 

 

 

 

VSS

See Table 3-3

GND

Ground Connections.

 

on page 41.

 

 

 

(Total of 92)

 

 

 

 

 

 

NC

See Table 3-3

---

No Connections. These lines should be left disconnected. Connecting a

 

on page 41.

 

pull-up/-down resistor or to an active signal could cause unexpected

 

(Total of 8)

 

results and possible malfunctions.

 

 

 

 

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

AMD Geode™ SC2200 Processor Data Book

73

Page 69
Image 69
AMD SC2200 PLL3 Analog Ground Connection, 3V PLL2 Analog Power Connection. Low noise power for PLL2, Ground Connections