參數(shù)資料
型號(hào): FW802C
英文描述: FW 802C LOW - POWER IEEE 1394A-2000 TWO CABLE TRANSCEIVER/ ARBITER DEVICE
中文描述: 防火墻802C低-動(dòng)力IEEE 1394A端口- 2000兩艘電纜收發(fā)器/仲裁器裝置
文件頁(yè)數(shù): 11/24頁(yè)
文件大?。?/td> 301K
代理商: FW802C
Data Sheet, Rev. 1
August 2002
FW802C Low-Power PHY IEEE1394A-2000
Two-Cable Transceiver/Arbiter Device
Agere Systems Inc.
11
Application Information
(continued)
5-6930 (F)
Figure 4. Typical Port Termination Network
1394 Application Support Contact Information
E-mail: support1394@agere.com
Crystal Selection Considerations
The FW802C is designed to use an external 24.576 MHz crystal connected between the XI and XO terminals to
provide the reference for an internal oscillator circuit. IEEE1394a-2000 standard requires that FW802C 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+
TPB1–
TPBIAS0
TPA0+
TPA0–
TPB0+
TPB0–
35
34
33
32
31
29
28
27
26
25
TPBIAS1
56
56
56
56
5 k
220 pF
0.33
μ
F
IEEE
1394
-1995 STANDARD
CONNECTOR
USE SAME PORT TERMINATION NETWORK AS ILLUSTRATED BELOW.
1
3
5
2
4
6
VG
VP
CABLE
POWER
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