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Avenger(TM)PCI音頻加速器)
中文描述: 雷鳥復(fù)仇者(商標(biāo))的PCI音頻加速器(雷鳥復(fù)仇者(商標(biāo))的PCI音頻加速器)
文件頁數(shù): 45/68頁
文件大?。?/td> 1303K
代理商: SAA7785
ThunderBird Avenger
TM
PCI Audio
Accelerator
SAA7785
Philips Semiconductors
Preliminary Specification
1999
Nov 12
45
TABLE 29
MAX_LAT Register - MAXLAT (RO)
SSA7785 ThunderBird Avenger CFG Space 0 DMA Base Registers
This section will describe the PCI configuration registers that provide functions such as base address remapping and
the like. These registers reside within the PCI interface.
TABLE 30
DMA Channel A Base Address Register - DMAABASE (RW)
Bit
Name
R/W
Function
7:0
MINGNT
RO
Minimum grant specifies how long of a burst period the device needs assum-
ing a clock speed of 33MHz. Since the SSA7785 ThunderBird Avenger,
function 0, will burst a maximum of 64 double words, therefore requiring
about 75 33MHz clocks or 2.25 microseconds. The time units specified are in
0.25 microsecond increments.
PCI CFG 0
D7
D6
D5
D4
D3
D2
D1
D0
Offset 3Fh
MAXLAT[7:0]
POR Value
0
0
1
0
1
0
0
0
Bit
Name
R/W
Function
7:0
MAXLAT
RO
Maximum latency specifies how often a device needs to gain access to the
PCI bus. The SSA7785 ThunderBird Avenger, function 0, should only
request the bus a a maximum of every 10 microseconds. The MAXLAT value
is computed using the same parameters as the MINGNT.
PCI CFG 0
D15
D14
D13
D12
D11
D10
D9
D8
Offset 40h
DMAABASE[15:8]
POR Value
0
0
0
0
0
0
0
0
D7
D6
D5
D4
D3
D2
D1
D0
DMAA
BASE[7]
R
DMAABASE[5:4]
R
XFRSIZ[1:0]
DDMAA
EN
POR Value
0
0
0
0
0
1
0
0
Bit
Name
R/W
Function
15:7
DMAABASE
RW
DMA channel A programmable base address, bits 15:7.
6
R
RO
Reserved. This bit must always be zero.
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