SAA7780 datasheet(45/70 Pages) PHILIPS

45 / 70 page

ThunderBird Q3D PCI Audio

SAA7780

Accelerator

Philips Semiconductors

Product Specification

1999 Sep 30

DMA Channel B Base Address Register - DMABBASE (RW)

5:4

DMAABASE

DMA channel A programmable base address, bits 5:4. These bits select a

channel number for this channel. In LAM DMAABASE[5:4] select the channel

number that this DMA represents, it should be different than

DMABBASE[5:4].

Reserved. This bit must always be zero.

2:1

XFRSIZ

DMA transfer size.

00 = reserved

10 = double word

11 = reserved

01 = reserved

DDMAAEN

DDMA channel A enable. This DDMA channel is enabled when this bit is set

to a one.

PCI CFG 0

D31

D30

D29

D28

D27

D26

D25

D24

Offset 42h

DMABBASE[15:8]

POR Value

D23

D22

D21

D20

D19

D18

D17

D16

DMAB

BASE[7]

DMABBASE[5:4]

DDMAB

POR Value

Bit

Name

R/W

Function

15:7

DMABBASE

DMA channel B programmable base address. Normally this base is set the

same as DMA channel A except for DMABBASE[5:4] which selects the

channel number. This is a requirement of some PC chipsets. Future chipsets

may eliminate this requirement. In LAM DMABBASE[5:4] select the channel

number that this DMA represents, it should be different than

DMAABASE[5:4].

Reserved. This bit must always be zero.

5:4

DMABBASE

DMA channel B programmable base address, bits 5:4. These bits select a

channel number for this channel. In LAM DMABBASE[5:4] select the channel

number that this DMA represents, it should be different than

DMAABASE[5:4].

3:1

Reserved. These bits must always be zeros.

DDMABEN

DMA channel B enable. This DDMA channel is enabled when this bit is set to

a one.

Bit

Name

R/W

Function

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