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| 型號(hào)： | CDB8952 |
| 廠商： | Cirrus Logic, Inc. |
| 英文描述： | CrystalLAN 100BASE-X and 10BASE-T Transceiver |
| 中文描述： | CrystalLAN個(gè)100Base - X和10Base - T的收發(fā)器 |
| 文件頁(yè)數(shù)： | 63/82頁(yè) |
| 文件大?。?/td> | 1130K |
| 代理商： | CDB8952 |
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CS8952
CrystalLAN
100BASE-X and 10BASE-T Transceiver
63
7. DESIGN CONSIDERATIONS
The CS8952 is a mixed-signal device containing
the high-speed digital and analog circuits required
to implement Fast Ethernet communication. It is
important the designer adhere to the following
guidelines and recommendations for proper and re-
liable operation of the CS8952. These guidelines
will also benefit the design with good EMC perfor-
mance.
7.1
The recommended connection of the twisted-pair
interface is shown if Figure
6
. The unused cable
pairs are terminated to increase the common-mode
performance. Common-mode performance is also
improved by connecting the center taps of the RX
Twisted Pair Interface
and TX input circuits to the DC-isolated ground
plane. The 0.01 μF capacitor C1 must provide 2KV
(1,500 Vrms for 60 seconds) of isolation to meet
802.3 requirements. If a shielded RJ45 connector is
used (recommended), the shield should be connect-
ed to chassis ground.
7.2
Figure
7
shows the recommended connection for a
100BASE-FX interface to a Hewlett-Packard
HFBR-5103 fiber transceiver. Termination circuit-
ry may need to be revised for other fiber transceiv-
ers. The FX Drive bit in the Loopback, Bypass, and
Receiver Error Mask Register (address 18h) may
be used to tailor the PECL interface for 50
or
150
loads.
100BASE-FX Interface
0
Jabber Enable
Read/Write 1
When set, the jabber function is enabled. When
clear, and if the CS8952 is in 10BASE-T full-duplex
or 10BASE-T ENDEC loopback mode, the jabber
function is disabled.
Note:
When the National Compatibility Mode bit (bit
7) is set, the Jabber function may also be disabled
for 10BASE-T half-duplex, although this is not rec-
ommended.
BIT
NAME
TYPE
RESET
DESCRIPTION
49.9
49.9
0.1 μF
0.1 μF
CS8952
TX+
TX-
RX+
RX-
80
81
91
92
NC
16
15
2
1
14
3
10
11
6
7
12
T1
TG22-3506
5
51
75
0.01 μF
75
51
51
51
51
1
2
3
4
5
6
7
8
RJ-45
SHLD
SHLD
2KV
51
Figure 6. Recommended Connection of Twisted-Pair Ports (Network Interface Card)
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