CS5530 Datasheet

IC型号：
CS5530
PDF描述：
National Semiconductor [Geode⑩ CS5530 I/O Companion Multi-...
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Geode鈩?CS5530

Architecture Overview

(Continued)

1.5

POWER MANAGEMENT

The CS5530 integrates advanced power management

features including:

鈥?Idle timers for common system peripherals

鈥?Address trap registers for programmable address

ranges for I/O or memory accesses

鈥?Up to eight programmable GPIOs

鈥?Clock throttling with automatic speedup for the CPU

clock

鈥?Software CPU stop clock

鈥?Zero Volt Suspend/Resume with peripheral shadow

registers

鈥?Dedicated serial bus to/from the GXLV processor

providing CPU power management status

The CS5530 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 鈥淔ixed Feature鈥?and 鈥淕eneral Purpose鈥?/div>

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 virtu-

alization is transparent; however, to eliminate unneces-

sary latencies, the ACPI timer exists in physical hardware.

The CS5530 V-ACPI (Virtual ACPI) solution provides the

following support:

鈥?CPU States 鈥?C1, C2

鈥?Sleep States 鈥?S1, S2, S4, S4BIOS, S5

鈥?Embedded Controller (Optional) 鈥?SCI and SWI event

inputs.

鈥?General Purpose Events

鈥?/div>

Fully programmable GPE0

Event Block registers.

1.5.1 GPIO Interface

Eight GPIO pins are provided for general usage in the

system. GPIO[3:0] are dedicated pins and can be config-

ured 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

transitions.

SDAT_I

SDAT_O

SDATA_IN

SDATA_OUT

The hardware portion of the XpressAUDIO subsystem

can broadly be divided into two categories. Hardware for:

鈥?Transporting streaming audio data to/from the system

memory and an AC97 codec.

鈥?VSA technology support.

1.6.1 AC97 Codec Interface

The CS5530 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 CS5530. This type of

codec will allow for a design which meets the require-

ments for PC97 and PC98-compliant audio as defined by

Microsoft Corporation. Figure 1-2 shows the codec and

CS5530 signal connections. For specifics on the serial

interface, refer to the appropriate codec manufacturer鈥檚

data sheet.

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

bus mastering controller.

External Source

BITCLK

BIT_CLK

24.576 MHz

SYNC

PC_BEEP

AC97

Geode鈩?/div>

CS5530

SYNC

PC_BEEP

Codec

Figure 1-2. AC97 Codec Signal Connections

1.6.2 VSA Technology Support Hardware

The CS5530 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.

1.6

XPRESSAUDIO

XpressAUDIO in the CS5530 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

necessary support for industry standard 16-bit stereo syn-

thesis and OPL3 emulation.

www.national.com

Revision 4.1

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