參數(shù)資料
型號: SAA7780
廠商: NXP SEMICONDUCTORS
元件分類: 消費家電
英文描述: ThunderBird Q3DE PCI Audio Accelerator(雷鳥 Q3DE PCI音頻加速器)
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP160
封裝: 28 X 28 MM, 3.42 MM HEIGHT, PLASTIC, QFP-160
文件頁數(shù): 44/70頁
文件大?。?/td> 348K
代理商: SAA7780
ThunderBird Q3D PCI Audio
Accelerator
SAA7780
Philips Semiconductors
Product Specification
1999 Sep 30
44
MAX_LAT Register - MAXLAT (RO)
SAA7780 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.
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
assuming a clock speed of 33MHz. Since the SAA7780, 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 SAA7780, 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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