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參數(shù)資料
| 型號(hào)： | LXT972A |
| 廠商： | Intel Corp. |
| 英文描述： | 3.3V Dual-Speed Fast Ethernet Transceiver Datasheet |
| 中文描述： | 3.3雙速快速以太網(wǎng)收發(fā)器數(shù)據(jù)表 |
| 文件頁(yè)數(shù)： | 28/70頁(yè) |
| 文件大?。?/td> | 833K |
| 代理商： | LXT972A |
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LXT972A
—
3.3V Dual-Speed Fast Ethernet Transceiver Datasheet
28
Datasheet
3.6.7
Loopback
The LXT972A provides two loopback functions, operational and test (see
Table 9
). Loopback
paths are shown in
Figure 12
.
3.6.7.1
Operational Loopback
Operational loopback is provided for 10Mbps half-duplex links when bit 16.8 = 0. Data transmitted
by the MAC (TXData) is looped back on the receive side of the MII (RXData). Operational
loopback is not provided for 100Mbps links, full-duplex links, or when 16.8 = 1.
3.6.7.2
Test Loopback
A test loopback function is provided for diagnostic testing of the LXT972A. During test loopback,
the twisted-pair interface is disabled. Data transmitted by the MAC is internally looped back by the
LXT972A and returned to the MAC.
Test loopback is available for both 100TX and 10T operation. Test loopback is enabled by setting
bits as follows:
0.14 = 1
0.8 = 1 (full-duplex)
0.12 = 0 (disable auto-negotiation).
Figure 12. Loopback Paths
Table 9. Carrier Sense, Loopback, and Collision Conditions
Speed
Duplex Condition
Carrier Sense
Test
1
Loopback
Operational
Loopback
Collision
100Mbps
Full-Duplex
Receive Only
Yes
No
None
Half-Duplex
Transmit or Receive
No
No
Transmit and Receive
10Mbps
Full-Duplex
Receive Only
Yes
No
None
Half-Duplex, 16.8 = 0
Transmit or Receive
Yes
Yes
Transmit and Receive
Half-Duplex, 16.8 = 1
Transmit or Receive
No
No
Transmit and Receive
1. Test Loopback is enabled when 0.14 = 1
10T
Loopback
Digital
Block
MII
TX Driver
100X
Loopback
Analog
Block
LXT972A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LXT972ALC | 3.3V Dual-Speed Fast Ethernet Transceiver Datasheet |
| LXT972M | Single-Port 10/100 Mbps PHY Transceiver |
| LXT9763 | Fast Ethernet 10/100 Hex Transceiver with Full MII |
| LXT9763HC | LAN TRANSCEIVER|HEX|QFP|208PIN|PLASTIC |
| LXT9784 | Transceiver Hardware Integrity Function Overview |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LXT972ALC | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:3.3V Dual-Speed Fast Ethernet Transceiver Datasheet |
| LXT972LCHFB8 | 制造商:LEVEL_ONE 功能描述: |
| LXT972M | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Single-Port 10/100 Mbps PHY Transceiver |
| LXT973QC | 制造商:Intel 功能描述:LAN Transceiver, Dual, 100 Pin, Plastic, QFP |
| LXT974 | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Fast Ethernet 10/100 Quad Transceivers |
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