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21 power and ground connections – AMD Geode SC1201 User Manual

Page 70

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70

AMD Geode™ SC1200/SC1201 Processor Data Book

Signal Definitions

32579B

3.4.21

Power and Ground Connections

1

Signal Name

Ball No.

Type

Description

AV

SSPLL2

C16

GND

Analog PLL2 Ground Connection.

AV

SSPLL3

AK3

GND

Analog PLL3 Ground Connection.

V

PLL2

A17

PWR

3.3V PLL2 Analog Power Connection. Low noise power for PLL2 and
PLL5.

V

PLL3

AJ4

PWR

3.3V PLL3 Analog Power Connection. Low noise power for PLL3,
PLL4, and PLL6.

AV

CCUSB

D27

PWR

3.3V Analog USB Power Connection. Low noise power for USB.

AV

SSUSB

C27

GND

Analog USB Ground Connection.

AV

CCCRT

A12, C13, D15

PWR

3.3V Analog CRT DAC Power Connections. Low noise power.

AV

SSCRT

B14, C14, C15

GND

Analog CRT DAC Ground Connections. Return
current.

V

CCCRT

D12

PWR

1.8V CRT DAC Digital Power Connection. Can be directly connected to
V

CORE

on PCB (printed circuit board).

V

SSCRT

C12

GND

CRT DAC Digital Ground Connection. Can be directly connected to V

SS

on PCB.

AV

CCTV

D23

PWR

3.3V Analog TV DAC Power Connection. Low noise power.

AV

SSTV

B24

GND

Analog TV DAC Ground Connection. Return current.

V

BAT

AL3

PWR

Battery. Provides battery back-up to the RTC and ACPI registers, when
V

SB

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 V

BAT

to V

SS

.

V

SB

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.

V

SBL

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 V

SS

. This supply must be present when V

SB

is present.

V

CORE

See Table 3-3

on page 40

(Total of 28)

PWR

1.8V Core Processor Power Connections.

V

IO

See Table 3-3

on page 40

(Total of 42)

PWR

3.3V I/O Power Connections.

V

SS

See Table 3-3

on page 40

(Total of 91)

GND

Ground Connections.

1.

All power sources except V

BAT

must be connected, even if the function is not used.

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