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AMD Geode™ SC3200 Processor Data Book

Signal Definitions

Revision 5.1

3.1

Ball Assignments

The SC3200 is highly configurable as illustrated in Figure

3-1 on page 25. Strap options and register programming

are used to set various modes of operation and specific

signals on specific balls. This section describes which sig-

nals are available on which balls and provides configuration

information:

• Figure 3-2 on page 28 and Figure 3-3 on page 42: Illus-

trations of EBGA and TEPBGA ball assignments.

• Table 3-2 on page 29 and Table 3-4 on page 43: Lists

signals according to ball number. Power Rail, Signal

Type, Buffer Type and, where relevant, Pull-Up or Pull-

Down resistors are indicated for each ball in this table.

For multiplexed balls, the necessary configuration for

each signal is listed as well.

• Table 3-3 on page 38 and Table 3-5 on page 54: Quick

reference signal list sorted alphabetically - listing all

signal names and ball numbers.The tables in this

chapter use several common abbreviations. Table 3-1

lists the mnemonics and their meanings

Notes:

For each GPIO signal, there is an optional pull-up

resistor on the relevant ball. After system reset, the

pull-up is present.

This pull-up resistor can be disabled via registers in

the Core Logic module. The configuration is without

regard to the selected ball function (except for

GPIO12, GPIO13, and GPIO16). Alternate functions

for GPIO12, GPIO13, and GPIO16 control pull-up

resistors.

For more information, see Section 6.4.1 "Bridge,

GPIO, and LPC Registers - Function 0" on page 206.

Configuration settings listed in this table are with

regard to the Pin Multiplexing Register (PMR). See

Section 4.2 "Multiplexing, Interrupt Selection, and

Base Address Registers" on page 88 for a detailed

description of this register.

Table 3-1. Signal Definitions Legend

Mnemonic

Definition

Analog

AVSS

Ground ball: Analog

AVCC

Power ball: Analog

GCB

General Configuration Block registers.

Refer to Section 4.0 "General Configura-

tion Block" on page 87.

Location of the General Configuration

Block cannot be determined by software.

See the AMD Geode™ SC3200 Specifi-

cation Update document.

Input ball

I/O

Bidirectional ball

MCR[x]

Miscellaneous Configuration Register

Bit x: A register, located in the GCB.

Refer to Section 4.1 "Configuration

Block Addresses" on page 87 for further

details.

Output ball

Open-drain

Pull-down

PMR[x]

Pin Multiplexing Register Bit x: A regis-

ter, located in the GCB, used to config-

ure balls with multiple functions. Refer to

Section 4.1 "Configuration Block

Addresses" on page 87 for further

details.

Pull-up

TRI-STATE

VCORE

Power ball: 1.2V

VIO

Power ball: 3.3V

VSS

Ground ball

The # symbol in a signal name indicates

that the active or asserted state occurs

when the signal is at a low voltage level.

Otherwise, the signal is asserted when

at a high voltage level.

A / in a signal name indicates both func-

tions are always enabled (i.e., cycle mul-

tiplexed).

A + in signal name indicates the function

is available on the ball, but that either

strapping options or register program-

ming is required to select the desired

function.

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