SAA7780 datasheet(38/70 Pages) PHILIPS

38 / 70 page

ThunderBird Q3D PCI Audio

SAA7780

Accelerator

Philips Semiconductors

Product Specification

1999 Sep 30

SAA7780 CFG Space 0 Non-Legacy Base Address Registers

The ThunderBird Base Address Register (SONGBASE) is used to I/O map all of the non-legacy I/O devices in the

SAA7780 chip. The SONGBASE register maps the two DMA channels, the AC Link registers, the Host/DSP interface,

the Serial Port interfaces, and the Multimedia Timer. The offset index for each are shown below.

SAA7780 Non-Legacy I/O Device Map

Bit

Name

R/W

Function

BIST

BIST capable. BIST is not supported in the SAA7780, function 0 at this

revision. It may be desired to include a BIST test for the DSP at a later time.

START

If BIST capable, this bit will start the BIST. Writing a 1 will start the test and

the BIST should write this bit to a zero when complete. Software should fail

the device if the BIST is not complete after 2 seconds.

5:4

Reserved. These bits always return zero.

3:0

CODE

Completion Code. A value of zero means the device has passed its test.

Non-zero values means the device has failed using device specific failure

codes.

Device Name

Byte 3

Byte 2

Byte 1

Byte 0

Offset

Multimedia Timer

TMCOUNT2

TMCOUNT1

TMCOUNT0

TMSTAT

00h

Reserved

04h

Reserved

08h

Reserved

0Ch

Serial Ports

Reserved

10h

Reserved

14h

Reserved

18h

Reserved

1Ch

Host/DSP Interface

HDPCTL

HDDATA

20h

HDDLA

HDPSTT

24h

Reserved

HDDLD

28h

Reserved

2Ch

AC Link Interface

ACDATA

ACADDR

30h

ACSTAT

ACCTRL

34h

ACPCML

38h

ACPCMR

3Ch

Serial IRQ

Reserved

IRQCTL

40h

Thunderbird Reserved

Reserved

44-7Fh

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