參數(shù)資料
型號(hào): SAA7785
廠商: NXP Semiconductors N.V.
英文描述: ThunderBird Avenger(TM) PCI Audio Accelerator(雷鳥(niǎo)Avenger(TM)PCI音頻加速器)
中文描述: 雷鳥(niǎo)復(fù)仇者(商標(biāo))的PCI音頻加速器(雷鳥(niǎo)復(fù)仇者(商標(biāo))的PCI音頻加速器)
文件頁(yè)數(shù): 46/68頁(yè)
文件大?。?/td> 1303K
代理商: SAA7785
ThunderBird Avenger
TM
PCI Audio
Accelerator
SAA7785
Philips Semiconductors
Preliminary Specification
1999
Nov 12
46
TABLE 31
DMA Channel B Base Address Register - DMABBASE (RW)
5:4
DMAABASE
RW
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 DMAB-
BASE[5:4].
3
R
RO
Reserved. This bit must always be zero.
2:1
XFRSIZ
RW
DMA transfer size.
00 = reserved
10 = double word
11 = reserved
01 = reserved
0
DDMAAEN
RW
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
0
0
0
0
0
0
0
0
D23
D22
D21
D20
D19
D18
D17
D16
DMAB
BASE[7]
R
DMABBASE[5:4]
R
R
R
DDMAB
EN
POR Value
0
0
0
0
0
0
0
0
Bit
Name
R/W
Function
15:7
DMABBASE
RW
DMA channel B programmable base address. Normally this base is set the
same as DMA channel A except for DMABBASE[5:4] which select the chan-
nel number. This is a requirement of some PC chipsets, future chipsets may
eliminate this requirement. In LAM DMABBASE[5:4] select the channel num-
ber that this DMA represents, it should be different than DMAABASE[5:4].
6
R
RO
Reserved. This bit must always be zero.
5:4
DMABBASE
RW
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 DMAA-
BASE[5:4].
3:1
R
RO
Reserved. These bits must always be zeros.
0
DDMABEN
RW
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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