CS8952(2001) 查看數據表（PDF） - Cirrus Logic
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CS8952 Datasheet PDF : 82 Pages
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CS8952
BIT
NAME
0
Jabber Enable
TYPE
RESET
Read/Write 1
DESCRIPTION
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.
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 Twisted Pair Interface
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
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 100BASE-FX Interface
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 Ω or
150 Ω loads.
TX+ 80
16
CS8952
14
TX- 81
15
RX+ 91
2
RX- 92
49.9 Ω
0.1 µF
1
49.9 Ω
0.1 µF
T1
TG22-3506
10
12
11
6
5
1
2
3
51 Ω
4
51 Ω
5
6
51 Ω
7
7
51 Ω
8
3
75 Ω
NC
0.01 µF
2KV
75 Ω
51 Ω
51 Ω
Figure 6. Recommended Connection of Twisted-Pair Ports (Network Interface Card)
SHLD
RJ-45
SHLD
CrystalLAN™ 100BASE-X and 10BASE-T Transceiver
63
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