32581C

Signal Definitions

 

 

3.4.20Power, Ground and No 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.

AVSSUSB

C27

GND

Analog USB Ground Connection.

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 352). 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 29)

 

 

 

 

 

 

VIO

See Table 3-3

PWR

3.3V I/O Power Connections.

 

on page 40.

 

 

 

(Total of 46)

 

 

 

 

 

 

VSS

See Table 3-3

GND

Ground Connections.

 

on page 40.

 

 

 

(Total of 96)

 

 

 

 

 

 

NC

See Table 3-3

---

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

 

on page 40.

 

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

 

(Total of 13)

 

results and possible malfunctions.

 

 

 

 

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

68

AMD Geode™ SC3200 Processor Data Book

Page 68
Image 68
AMD SC3200 manual Power, Ground and No Connections1