FLLXT1000BA.C4QE000 Intel, FLLXT1000BA.C4QE000 Datasheet - Page 24

• Manufacturer Part Number: FLLXT1000BA.C4QE000
• Manufacturer: Intel

Specifications of FLLXT1000BA.C4QE000

• Lead Free Status / RoHS Status: Not Compliant

LXT1000 — Gigabit Ethernet Transceiver
2.3
2.3.1
2.3.1.1
24
Table 9.
Figure 5. Crossover Function
Interface Descriptions
Network Interface
The LXT1000 uses a single common network interface to support 1000BASE-T, 100BASE-TX,
and 10BASE-T. This interface consists of four signal pairs—A, B, C, and D. Each signal pair
consists of two bidirectional balls that can transmit and receive at the same time. The network
physical interface consists of passive devices and magnetics. For 1000BASE-T, all four pairs are
used in both directions at the same time. For 10/100 links and during auto-negotiation, only pairs A
and B are used.
“Application Information” on page 66
Mapping of Twisted-Pair Outputs to RJ-45s
MDI/MDIX Configuration
For 1000BASE-T links, pair identification is determined automatically in accordance with the
standard.
The LXT1000 has an Automatic Crossover Detection function. If the crossover ball is left open,
the LXT1000 automatically detects which application is being used and configures itself
accordingly. If the CROSS ball is tied Low, the LXT1000 configures itself as a classic MDI (DTE/
NIC) device with Pair A as transmit and pair B as receive. If the CROSS ball is tied High, the
LXT1000 configures itself as an MDIX device (repeater/switch), with Pair B as transmit and Pair
A as receive (refer to
Pair
A
B
C
D
LXT1000
MDI (DTE/NIC)
Table 9
CROSS = 0
TX
RX
TX
RX
Figure 5
shows the mapping between the pairs and the RJ-45 signals. Refer to
A
B
C
D
and
3
1
6
4
5
7
8
2
Table
TX
RX
TX
RX
Flat Cable
for more details.
RJ-45s
1 and 2
3 and 6
4 and 5
7 and 8
10).
RX
TX
RX
TX
1
2
3
6
4
5
7
8
MDIX (Switch)
CROSS = 1
B
C
A
D
RX
TX
RX
TX
Document #: 249276
Rev. Date: 07/20/01
Revision #: 002
Datasheet