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參數(shù)資料
| 型號： | LXT970A |
| 廠商： | Intel Corp. |
| 英文描述： | Dual-Speed Fast Ethernet Transceiver |
| 中文描述： | 雙速度快速以太網(wǎng)收發(fā)器 |
| 文件頁數(shù)： | 23/74頁 |
| 文件大?。?/td> | 1061K |
| 代理商： | LXT970A |
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Dual-Speed Fast Ethernet Transceiver
—
LXT970A
Datasheet
23
Test Loopback
A test loopback function is provided for diagnostic testing of the LXT970A. During test loopback
the twisted-pair interface is disabled. Data transmitted by the MAC is internally looped back by
the LXT970A and returned to the MAC.
Test loopback is available for 100 Mbps and 10 Mbps operation. Loopback paths for the two modes
of operation are shown in
Figure 6
.
Test loopback is enabled by setting bit 0.14 = 1 (loopback), bit 0.8 = 1 (full-duplex), and bit 0.12 =
0 (disable auto-negotiation). The desired mode of operation for test loopback is set using bits 0.13
and 19.2 as shown in
Table 10
.
Collision
The LXT970A asserts its collision signal, asynchronously to any clock, whenever the line state is
half-duplex and the transmitter and receiver are active at the same time.
Table 11
summarizes the
conditions for assertion of carrier sense, collision, and data loopback signals.
Table 10. Test Loopback Operation
Mode of Operation
Bit
19.2
0.13
10 Mbps Test Loopback
0
0
100 Mbps Test Loopback
1
1
1. Also set bit 0.14 = 1, bit 0.8 = 1, and 0.12 = 0 to enable Test
Loopback.
Figure 6. Loopback Paths
Digital
Block
MII
Analog
Block
FX
Driver
TX
Driver
100 Mbps
Loopback
10 Mbps
Loopback
Table 11. Carrier Sense, Loopback, and Collision Conditions
Speed & Duplex Condition
Carrier Sense
Operational
Loopback
Collision
Full-Duplex at 10 Mbps or 100 Mbps
Repeater Mode
Receive only
None
None
100 Mbps, Half-Duplex
Transmit or Receive
None
Transmit and Receive
10 Mbps, Half-Duplex, 19.11 = 0
Transmit or Receive
Yes
Transmit and Receive
10 Mbps, Half-Duplex, 19.11 = 1
Receive only
None
Transmit and Receive
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| LXT970AQC | 制造商:LEVEL ONE 功能描述: 制造商:LEVELONE 功能描述: 制造商: 功能描述: 制造商:LEVEL1 功能描述: |
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