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參數(shù)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(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)： | 66/68頁 |
| 文件大小： | 1303K |
| 代理商： | SAA7785 |
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ThunderBird Avenger
TM
PCI Audio
Accelerator
SAA7785
Philips Semiconductors
Preliminary Specification
1999
Nov 12
66
MULTIMEDIA TIMER I/O SPACE REGISTERS
TABLE 70
TMSTAT (RW/RO) - MULTIMEDIA TIMER STATUS REGISTER
MULTIMEDIA TIMER COUNT REGISTERS
There are three registers required to hold the timer value. These three registers can be read at different cycles, It is rec-
ommended that the least significant byte be read first for the most accuracy.
TABLE 71
TMCOUNT2 (RW/RO) - MULTIMEDIA TIMER COUNT REGISTER 2
2
FSTCLK
RW
Fast Clock Enable. When set, the timer counter will use the CCLK clock
instead of the 570 ns clock. This function will reduce the simulation and test
time of the device.
1
TMRRST
RW
Timer Reset. When set, this bit holds the multimedia timer in reset. The mul-
timedia timer is also reset by the system reset.
0
R
RO
Reserved. This bit returns a zero.
SONGBASE
D7
D6
D5
D4
D3
D2
D1
D0
Offset 00h
R
R
R
R
TPLD
TRE-
SUME
TMINT
TINTEN
POR Value
0
0
0
0
0
0
0
0
Bit
Name
R/W
Function
7:4
R
RO
Reserved. These bits return zeros.
3
TPLD
RW
Timer Preload Indicator. When set, this indicates the timer will start counting
from the values set in the timer count registers. When cleared, the timer will
start counting from zero or its last value when stopped
2
TRESUME
RW
Timer Resume. When set, the timer will resume counting at the next 570 ns
clock edge. When cleared, the timer will stop counting.
1
TMINT
WC
Timer Interrupt. When asserted, the multimedia timer has flagged an inter-
rupt when the timer has counted to zero. The timer will continue to count.
Writing a one to this bit will clear the interrupt.
0
TINTEN
RW
Timer Interrupt Enable. When set, the multimedia timer will generate an inter-
rupt.
SONGBASE
D7
D6
D5
D4
D3
D2
D1
D0
Offset 03h
R
R
R
R
TMCOUNT2[7:0]
POR Value
0
0
0
0
0
0
0
0
Bit
Name
R/W
Function
7:4
R
RO
Reserved. These bits return zeros.
Bit
Name
R/W
Function
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