CS5530A datasheet(9/259 Pages) NSC

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Revision 1.1

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Architecture Overview (Continued)

1.5

POWER MANAGEMENT

The CS5530A integrates advanced power management

features including:

• Idle timers for common system peripherals

• Address trap registers for programmable address

ranges for I/O or memory accesses

• Up to eight programmable GPIOs

• Clock throttling with automatic speedup for the CPU

clock

• Software CPU stop clock

• Save-to-Disk/RAM with peripheral shadow registers

• Dedicated serial bus to/from the GX-series processor

providing CPU power management status

The CS5530A is an ACPI (Advanced Control and Power

Interface) compliant chipset. An ACPI compliant system is

one whose underlying BIOS, device drivers, chipset and

peripherals conform to revision 1.0 or newer of the ACPI

specification. The “Fixed Feature” and “General Purpose”

registers are virtual. They are emulated by the SMI han-

dling code rather than existing in physical hardware. To the

ACPI compliant operating system, the SMI-base virtualiza-

tion is transparent; however, to eliminate unnecessary

latencies, the ACPI timer exists in physical hardware.

The CS5530A V-ACPI (Virtual ACPI) solution provides the

following support:

• CPU States — C1, C2

• Sleep States — S1, S2, S4, S4BIOS, S5

• Embedded Controller (Optional) — SCI and SWI event

inputs.

• General Purpose Events — Fully programmable GPE0

Event Block registers.

1.5.1

GPIO Interface

Eight GPIO pins are provided for general usage in the sys-

tem. GPIO[3:0] are dedicated pins and can be configured

as inputs or outputs. GPIO[7:4] can be configured as the

upper addresses of the ISA bus, SA[23:20]. All GPIOs can

also be configured to generate an SMI on input edge tran-

sitions.

1.6

XPRESSAUDIO

XpressAUDIO in the CS5530A offers a combined hard-

ware/software support solution to meet industry standard

audio requirements. XpressAUDIO uses VSA technology

along with additional hardware features to provide the nec-

essary support for industry standard 16-bit stereo synthe-

sis and OPL3 emulation.

The hardware portion of the XpressAUDIO subsystem can

broadly be divided into two categories. Hardware for:

• Transporting streaming audio data to/from the system

memory and an AC97 codec.

• VSA technology support.

1.6.1

AC97 Codec Interface

The CS5530A provides an AC97 Specification Revision

1.3, 2.0, and 2.1 compatible interface. Any AC97 codec

which supports an independent input and output sample

rate conversion interface (e.g., National Semiconductor

LM4548) can be used with the CS5530A. This type of

codec allows for a design which meets the requirements

for PC97 and PC98-compliant audio as defined by

Microsoft Corporation. Figure 1-2 shows the codec and

CS5530A signal connections. For specifics on the serial

interface, refer to the appropriate codec manufacturer’s

data sheet.

Low latency audio I/O is accomplished by a buffered PCI

bus mastering controller.

Figure 1-2. AC97 Codec Signal Connections

1.6.2

VSA Technology Support Hardware

The CS5530A I/O companion incorporates the required

hardware in order to support VSA technology for the cap-

ture and playback of audio using an external codec. This

eliminates much of the hardware traditionally associated

with industry standard audio functions.

XpressAUDIO software provides 16-bit compatible sound.

This software is available to OEMs for incorporation into

the system BIOS ROM.

BITCLK

PC_BEEP

SDAT_I

SDAT_O

PC_BEEP

SDATA_IN

SDATA_OUT

AC97

Geode™

BIT_CLK

24.576 MHz

SYNC

Codec

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CS5530A

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