CS5535 datasheet(32/555 Pages) NSC

32 / 555 page

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Revision 0.8

Signal Definitions (Continued)

SUSP#

Suspend. This signal goes low in response to events as determined

by the CS5535’s internal power management logic. It requests the

GX2 to enter the Suspend state. This is the default state for this ball at

reset. Not used in normal operation.

CIS

CPU Interface Serial. A 20-bit serial status word is output on this ball,

synchronized to PCI_CLK. Data changes on the rising edge and is

stable on the falling edge of PCI_CLK. This word is output whenever

one of the internally-monitored signals changes states. See Section

4.2.14 "CPU Interface Serial (CIS)" on page 79 for details. Used in

normal operation.

SUSPA#

Suspend Acknowledge. This input signal is driven low by the GX2

processor when it has successfully entered the Suspend state.

IRQ13

Interrupt Request Level 13. Floating Point error. Connect directly to

IRQ13 of the GX2 processor.

VBAT

Wire

Real-Time Clock Battery Back-Up. Battery voltage on this ball

keeps the real-time clock and CMOS RAM circuits continuously pow-

ered.

If not used, tie to ground.

2.4-3.6V, typical 3.0V.

10 µA max.

5 µAs typical.

This ball incorporates a reverse bias protection diode on-chip.

There is no need for an external diode.

VSS_VBAT1

AGND

Real-Time Clock Battery Grounds 1 and 2

VSS_VBAT2

LVD_EN#

Wire

Low Voltage Detect Enable. LVD_EN# enables/disables the on-chip

low voltage detect circuit. When disabled, the external subsystem

must assert RESET_STAND# as Standby power is applied and must

assert RESET_WORK# as Working power is applied. When LVD is

enabled, use of these two resets are optional. Generally,

RESET_STAND# would be tied high (not used) while

RESET_WORK# would be tied to a reset output that is typically avail-

able from the power supply. However, a system could just have a sim-

ple regulator circuit and also tie RESET_WORK# high.

Tie to VSS to enable. Tie to VIO_VSB to disable.

2.2.1

System Interface Signals (Continued)

Signal Name

Ball No.

Type

Description

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