CS4281 datasheet(13/36 Pages) CIRRUS

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DS308PP4

CS4281

CrystalClear™ PCI Audio Interface

CIRRUS LOGIC PRODUCT DATA SHEET

Byte 3

Byte 2

Byte 1

Byte 0

Offset

Device ID: R/O, 6005h for CS4281

Vendor ID: R/O, 1013h

00h

Status Register, bits 15-0:

Bit 15:

Detected Parity Error: Error Bit

Bit 14:

Signalled SERR: R/O: 0

Bit 13:

Received Master Abort: Error Bit

Bit 12:

Received Target Abort: Error Bit

Bit 11:

Signalled Target Abort: R/O 0

Bit 10-9: DEVSEL Timing: R/O, 01b (medium)

Bit 8:

Data Parity Error Detected: Error Bit

Bit 7:

Fast Back to Back Capable: R/O 0

Bit 6:

User Definable Features: R/O 0

Bit 5:

66MHz Bus: R/O 0

Bit 4:

New Capabilities: R/O 1

Bit 3-0: Reserved R/O 000

Reset Status State: 0210h

Write of 1 to any error bit position clears it.

Command Register, bits 15-0:

Bit 15-10: Reserved, R/O 0

Bit 9:

Fast B2B Enable: R/O 0

Bit 8:

SERR Enable: R/O, 0

Bit 7:

Wait Control: R/O 0

Bit 6:

Parity Error Response: R/W, default 0

Bit 5:

VGA Palette Snoop: R/O 0

Bit 4:

MWI Enable: R/O 0

Bit 3:

Special Cycles: R/O 0

Bit 2:

Bus Master Enable: R/W, default 0

Bit 1:

Memory Space Enable: R/W, default 0

Bit 0:

IO Space Enable: R/O 0

04h

Class Code: R/O 040100h

Class 04h (multimedia device), Sub-class 01h (audio), Interface 00h

Revision ID: R/O 01h

08h

BIST: R/O 0

Header Type:

Bit 7:

R/O 0

Bit 6-0: R/O 0 (type 0)

Latency Timer:

Bit 7-3: R/W,default 0

Bit 2-0: R/O 0

Cache Line Size:

R/O 0

0Ch

Base Address Register 0

Device Control Register space, memory mapped. 4kByte size

Bit 31-12: R/W, default 0. Compare address for register space accesses

Bit 11 - 4: R/O 0, specifies 4kByte size

Bit 3:

R/O 0, Not Prefetchable (Cacheable)

Bit 2-1:

R/O 00, Location Type - Anywhere in 32 bit address space

Bit 0:

R/O 0, Memory space indicator

10h

Base Address Register 1

Device Memory Array mapped into host system memory space, 64kByte size

Bit 31-16: R/W, default 0. Compare address for memory array accesses

Bit 15-4:

R/O 0, specifies 64kByte size

Bit 3:

R/O 0, Not Prefetchable (Cacheable)

Bit 2-1:

R/O 00, Location Type - Anywhere in 32 bit address space

Bit 0:

R/O 0, Memory space indicator

14h

Base Address Register 2: R/O 00000000h, Unused

18h

Base Address Register 3: R/O 00000000h, Unused

1Ch

Base Address Register 4: R/O 00000000h, Unused

20h

Base Address Register 5: R/O 00000000h, Unused

24h

Cardbus CIS Pointer: R/O 00000000h, Unused

28h

Table 2. PCI Configuration Space

CS4281 Datasheet(PDF) 13 Page - Cirrus Logic

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