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參數資料
| 型號： | 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： | 雷鳥復仇者（商標）的PCI音頻加速器（雷鳥復仇者（商標）的PCI音頻加速器） |
| 文件頁數： | 64/68頁 |
| 文件大?。?/td> | 1303K |
| 代理商： | SAA7785 |
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ThunderBird Avenger
TM
PCI Audio
Accelerator
SAA7785
Philips Semiconductors
Preliminary Specification
1999
Nov 12
64
TABLE 67
MIN_GNT Register - MINGNT (RO)
TABLE 68
MAX_LAT Register - MAXLAT (RO)
MULTIMEDIA TIMER
OVERVIEW
The Multimedia Timer is a 20 bit counter with 840ns resolution for general purpose use under host software control. The
timer subsystem consists of the 20-bit counter and I/O space registers. It takes three I/O cycles to read the complete
value of the Timer since the device allows only byte accesses.
The Multimedia Timer will get its time base by dividing down the CCLK clock. An interrupt and flag is provided to deter-
mine if the timer count has rolled over. The timer can either start from zero or be preloaded with a start value.
Bit
Name
R/W
Function
7:0
INTPIN
RO
Interrupt Pin. The interrupt pin register tells which interrupt the SSA7785
ThunderBird Avenger device uses. The read only value of 00h implies that
the SSA7785 ThunderBird Avenger device shares the INT A interrupt pin
with function 0. There is no legacy interrupt support for function 2.
PCI CFG 2
D7
D6
D5
D4
D3
D2
D1
D0
Offset 3Eh
MINGNT[7:0]
POR Value
0
0
0
0
0
0
0
0
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 2, is a target only, this register is read only and set to zero.
PCI CFG 2
D7
D6
D5
D4
D3
D2
D1
D0
Offset 3Fh
MAXLAT[7:0]
POR Value
0
0
0
0
0
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 2, is a target only,
this register is read only and set to zero.
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