參數(shù)資料
型號： LXT9880AHC
英文描述： Controller Miscellaneous - Datasheet Reference
中文描述： 控制器雜項-數(shù)據(jù)表參考
文件頁數(shù)： 24/96頁
文件大?。?/td> 1309K
代理商： LXT9880AHC
LXT980/980A Dual-Speed, 5-Port Fast Ethernet Repeater
24
Datasheet
2.1.1
TP/FX Port Configuration
The LXT980 reads the hardware configuration pins at power-up, hardware reset, or software reset
(but not at repeater reset), to determine operating conditions for each of its twisted-pair (TP) or
fiber (FX) ports. Each port has its own configuration pins so that it can be individually configured.
Software can monitor or change the configuration through the Port Speed Control Register (see
Table 61 on page 85
). The four possible configurations for each port are summarized in
Table 12
.
2.1.1.1
Forced Operation
A port can be directly configured to operate in one of three modes: 100FX, 100TX, or 10BT. When
a port is configured for forced operation via hardware or software, it immediately begins operating
in the selected mode. Forced operation is the only way to enable 100FX operation. All links are
established as half-duplex only. As a repeater, the LXT980 cannot support full-duplex operation.
2.1.1.2
Auto-Negotiation
Any port can be configured to establish its link via auto-negotiation. The port and its link partner
establish link conditions by exchanging Fast Link Pulse (FLP) bursts. Each FLP burst contains 16
bits of data that advertise the port
’
s capabilities. The FLP bursts sent by the port are maintained in
its Auto-negotiation Advertisement Register (
Table 81 on page 93
). The link partner
’
s abilities are
stored in the auto-negotiation link partner register (
Table 79 on page 92
). Status can be observed in
the respective Auto-negotiation Status Register (
Table 80 on page 93
). Each port has its own
advertisement, link partner advertisement, and Auto-negotiation Status Registers.
When auto-negotiation is enabled, the capabilities advertised by the LXT980 are predetermined
and cannot be changed; the advertisement register is read only, except for bit 13 (remote fault). The
LXT980 always advertises 100 half duplex and 10 half duplex. it never advertises 10 or 100 full-
duplex.
If the link partner does not support auto-negotiation, the LXT980 determines link state by listening
for 100 Mbps IDLE symbols or 10 Mbps link pulses. If it detects either of these signals, it
configures the port and updates the status registers appropriately.
2.1.1.3
Link Establishment and TP Port Connection
Once a port establishes link, the LXT980 automatically connects it to the appropriate repeater state
machine. If link loss is detected and auto-negotiation is enabled, the port returns to the auto-
negotiation state.
2.1.1.4
Changing Port Speed
In order to change port speed while operating, the following sequence is required:
Table 12. Manual Speed Selection
SPD1
SPD0
Speed Selection
0
0
Allow 10/100 auto-negotiation/parallel
detection on copper media
0
1
Force port to 10BASE-T mode
1
0
Force port to 100BASE-FX mode
1
1
Force port to 100BASE-TX mode
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