CS4611 データシートの表示（PDF） - Cirrus Logic
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CS4611 Datasheet PDF : 29 Pages
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CS4610/11
CrystalClear™ SoundFusion™ PCI Audio Accelerator
Byte 3
Byte 2
Byte 1
Byte 0
Offset
Cardbus CIS Pointer: R/O 00000000h, Unused
28h
Subsystem ID
Subsystem Vendor ID
2Ch
R/O 0000h
R/O 0000h
see Subsystem Vendor ID Fields section
see Subsystem Vendor ID Fields section
Expansion ROM Base Address: R/O 00000000h, Unused
30h
Reserved: R/O 00000000h
34h
Reserved: R/O 00000000h
38h
Max_Lat: R/O 18h
Min_Gnt: R/O 04h
Interrupt Pin:
Interrupt Line:
3Ch
24 x 0.25uS = 6 uS
4 x 0.25uS = 1uS
R/O 01h, INTA used R/W, default 0
Table 2. CS4610/11 PCI Configuration Space 1 (Continued)
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.
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DS241PP5
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