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Revision 1.1

Electrical Specifications (Continued)

Table 7-3 indicates which power rails are used for each sig-

nal of the SC1100 external interface. Power planes not

listed in this table are internal, and are not related to sig-

nals of the external interface.

7.1.4

DC Current

DC current is not a simple measurement. Three of the

SC1100 power states (On, Active Idle, Sleep) were

selected for measurement. For each power state mea-

sured, two functional characteristics (Typical Average,

Absolute Maximum) are used to determine how much cur-

rent the SC1100 uses.

7.1.4.1

Power State Parameter Definitions

The DC characteristics tables in this section list Core and

I/O current for three of the power states. For more explana-

tion on the SC1100 power states see Section 5.2.9 "Power

Management Logic" on page 134.

•On (C0): All internal and external clocks with respect to

the SC1100 are running and all functional blocks inside

the GX1 module (CPU Core, Memory Controller, etc.)

are actively generating cycles. This is equivalent to the

ACPI specification’s “S0,C0” state.

• Active Idle (C1): The CPU Core has been halted, all

other functional blocks are actively generating cycles.

This state is entered when a HLT instruction is executed

by the CPU Core. From a user’s perspective, this state is

indistinguishable from the On state and is equivalent to

the ACPI specification’s “S0,C1” state.

• Sleep (SL2): This is the lowest power state the SC1100

can be in with voltage still applied to the device’s core

and I/O supply pins. This is equivalent to the ACPI spec-

ification’s “S1” state.

7.1.4.2

Definition and Measurement Techniques of

SC1100 Current Parameters

The following two parameters describe the SC1100 current

while in the On state:

• Typical Average: Indicates the average current used by

the SC1100 while in the On state. This is measured by

running typical Windows applications with power

management disabled (to guarantee that the SC1100

never goes into the Active Idle state). This number is

provided for reference only since it can vary greatly

depending on the usage model of the system.

Note:

This typical average should not be confused with

the typical power numbers shown in Table 7-2 on

page 281. The numbers in Table 7-2 are based on

a combination of On (Typical Average) and Active

Idle states.

• Absolute Maximum: Indicates the maximum instanta-

neous current used by the SC1100. CPU Core current is

measured by running the Landmark Speed 200 bench-

mark test (with power management disabled) and

measuring the peak current at any given instant during

the test. I/O current is measured by running Microsoft

Windows 98.

Table 7-3. Power Planes of External Interface Signals

Power Plane

Signal Names

VCC Balls

VSS Balls

Standby

GPWIO[0:2], ONCTL#, PWRBTN#, PWRCNT[1:2], THRM#,

IRRX1, RI#

VSB

VSS

Battery

X32I, X32O

VBAT

VSS

USB

DPOS_PORT1, DNEG_PORT1, DPOS_PORT2,

DNEG_PORT2, DPOS_PORT3, DNEG_PORT3

AVCCUSB

AVSSUSB

I/O

All other external interface signals

VIO

VSS

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