CS4610 datasheet(14/29 Pages) CIRRUS

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DS241PP5

CS4610/11

CrystalClear™ SoundFusion™ PCI Audio Accelerator

Subsystem Vendor ID Fields

The Subsystem ID and Subsystem Vendor ID

fields in the CS4610/11 PCI Configuration Space

default to value 0000h unless an external EEPROM

device is detected or unless the host has written to

the appropriate internal register to program the val-

ues. When programmed through the EEPROM all

four bytes can be written. However, when pro-

gramming though the host interface (BIOS code),

only the Subsystem Vendor ID (bytes 1 and 0) can

be programmed. The Subsystem ID (bytes 3 and 2)

is forced to the most significant byte (byte 1) of the

Subsystem Vendor ID. Therefore, when loaded

though host code, bytes one, two and three will all

have the same value.

CS4610/11 Interrupt Signal

The CS4610/11 PCI Interface includes an interrupt

controller function which receives interrupt re-

quests from multiple sources within the CS4610/11

device, and presents a single interrupt line (INTA#)

to the host system. Interrupt control registers in the

CS4610/11 provide the host interrupt service rou-

tine with the ability to identify the source of the in-

terrupt and to clear the interrupt sources. In the

CS4610/11, the single external interrupt is expand-

ed by the use of “virtual channels”. Each data

stream which is read from or written to a modulo

buffer is assigned a virtual channel number. This

virtual channel number is signalled by the DMA

subsystem anytime the associated modulo buffer

pointer passes the mid-point or wraps around. Vir-

tual channels are also used for message passing be-

tween the CS4610/11 and the host.

Serial Port Configurations

The CS4610/11 provides a flexible Serial Audio

Interface which allows connection to external Ana-

log-to-Digital Converters (ADCs), Digital-to-Ana-

log Converters (DACs) or Codecs (combined ADC

and DAC functions) in several different configura-

tions. The CS4610/11 serial audio interface in-

cludes a primary input/output port with dedicated

serial data pins (SDIN, SDOUT), two auxiliary au-

dio output ports (SDO2, SDO3) which share pins

with the joystick interface button input functions,

and one auxiliary audio input port (SDIN2). Each

of these digital audio input and output pins carry

two channels of audio data. These two channels

may comprise the left and right channels of a stereo

audio signal, or they may be two independent mon-

aural audio signals.

Cardbus CIS Pointer: R/O 00000000h, Unused

28h

Subsystem ID

R/O 0000h

see

Subsystem Vendor ID Fields section

Subsystem Vendor ID

R/O 0000h

see

Subsystem Vendor ID Fields section

2Ch

Expansion ROM Base Address: R/O 00000000h, Unused

30h

Reserved: R/O 00000000h

34h

Reserved: R/O 00000000h

38h

Max_Lat: R/O 18h

24 x 0.25uS = 6 uS

Min_Gnt: R/O 04h

4 x 0.25uS = 1uS

Interrupt Pin:

R/O 01h, INTA used

Interrupt Line:

R/W, default 0

3Ch

Byte 3Byte 2Byte 1Byte 0

Offset

Table 2. CS4610/11 PCI Configuration Space 1 (Continued)

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