CS5530A datasheet(192/259 Pages) NSC

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192

Revision 1.1

4.3.4

XpressAUDIO Registers - Function 3

The register space for XpressAUDIO is divided into two

sections. The first section is used to configure the PCI por-

tion of the audio interface hardware. A Base Address Reg-

ister at F3 Index 10h (F3BAR) points to the base address

of where the second portion of the register space is

located. This second section contains the control and data

registers of the audio interface.

Table 4-20 shows the PCI header registers of F3. The

memory mapped registers accessed through F3BAR are

shown in Table 4-21.

If the F3 Audio Configuration Trap bit (F0 Index 42h[0]) is

enabled, an access to the PCI header registers causes an

SMI. Access through F3BAR is not affected by this bit.

Table 4-20. F3 Index xxh: PCI Header Registers for XpressAUDIO

Bit

Description

Index 00h-01h

Vendor Identification Register (RO)

Reset Value = 1078h

Index 02h-03h

Device Identification Register (RO)

Reset Value = 0103h

Index 04h-05h

PCI Command Register (R/W)

Reset Value = 0000h

15:3

Reserved (Read Only)

Reserved (Read/Write)

Memory Space: Allow CS5530A to respond to memory cycles from the PCI bus. 0 = Disable; 1 = Enable.

This bit must be enabled to access memory offsets through F3BAR (F3 Index 10h).

Reserved (Read Only)

Index 06h-07h

PCI Status Register (RO)

Reset Value = 0280h

Index 08h

Device Revision ID Register (RO)

Reset Value = 00h

Index 09h-0Bh

PCI Class Code Register (RO)

Reset Value = 040100h

Index 0Ch

PCI Cache Line Size Register (RO)

Reset Value = 00h

Index 0Dh

PCI Latency Timer Register (RO)

Reset Value = 00h

Index 0Eh

PCI Header Type (RO)

Reset Value =00h

Index 0Fh

PCI BIST Register (RO)

Reset Value = 00h

Index 10h-13h

Base Address Register - F3BAR (R/W)

Reset Value = 00000000h

This register sets the base address of the memory mapped audio interface control register block. This is a 128-byte block of registers

used to control the audio FIFO and codec interface, as well as to support SMIs produced by VSA technology. Bits [6:0] are read only

(0000000), indicating a 128-byte memory address range. Refer to Table 4-21 for the bit formats and reset values of the XpressAUDIO

registers.

31:7

Audio Interface Base Address

6:0

Address Range (Read Only)

Index 14h-3Fh

Reserved

Reset Value = 00h

Index 40h-FFh

Reserved

Reset Value = xxh

CS5530A Datasheet(PDF) 192 Page - National Semiconductor (TI)

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