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參數(shù)資料
| 型號： | FW804-09-DB |
| 英文描述： | PHY IEEE 1394A Four-Cable Transceiver/Arbiter Device |
| 中文描述： | PHY的IEEE 1394A端口四線收發(fā)器/仲裁器裝置 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 398K |
| 代理商： | FW804-09-DB |
Agere Systems Inc.
11
Data Sheet, Rev. 3
June 2001
Four-Cable Transceiver/Arbiter Device
FW804 PHY
IEEE
1394A
Application Information
(continued)
5-7654.b (F)
Figure 4. Typical Port Termination Network
1394 Application Support Contact Information
E-mail: 1394support@agere.com
Crystal Selection Considerations
The FW804 is designed to use an external 24.576 MHz crystal connected between the XI and XO terminals to pro-
vide the reference for an internal oscillator circuit.
IEEE
1394a-2000 standard requires that FW804 have less than
±100 ppm total variation from the nominal data rate, which is directly influenced by the crystal. To achieve this, it is
recommended that an oscillator with a nominal 50 ppm or less frequency tolerance be used.
The total frequency variation must be kept below
±
100 ppm from nominal with some allowance for error introduced
by board and device variations. Trade offs between frequency tolerance and stability may be made as long as the
total frequency variation is less than
±
100 ppm.
TPBIAS1
TPA1+
TPA1–
TPB1+
TPBIAS0
TPA0+
TPA0–
TPB0+
TPB0–
51
50
49
48
47
46
45
44
43
42
TPBIAS1
56
56
56
56
5 k
220 pF
0.33
μ
F
1
3
5
2
4
6
IEEE
1394-1995 STANDARD
CONNECTOR
USE SAME PORT TERMINATION NETWORK AS ILLUSTRATED BELOW.
VG
VP
CABLE
POWER
41
52
V
DDA
V
SSA
V
DDA
53
TPB1–
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