參數(shù)資料
型號(hào): WJLXT972MLC.A4
廠商: INTEL CORP
元件分類: 網(wǎng)絡(luò)接口
英文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP48
封裝: ROHS COMPLIANT, LQFP-48
文件頁(yè)數(shù): 32/92頁(yè)
文件大小: 1257K
代理商: WJLXT972MLC.A4
Intel
LXT972M Single-Port 10/100 Mbps PHY Transceiver
38
Datasheet
Document Number: 302875-005
Revision Date: 27-Oct-2005
5.6.2
Transmit Enable
The MAC must assert TX_EN the same time as the first nibble of preamble and de-assert TX_EN
after the last nibble of the packet.
5.6.3
Receive Data Valid
The LXT972M Transceiver asserts RX_DV when it receives a valid packet. Timing changes
depend on line operating speed:
For 100BASE-TX links, RX_DV is asserted from the first nibble of preamble to the last nibble
of the data packet.
For 10BASE-T links, the entire preamble is truncated. RX_DV is asserted with the first nibble
of the Start of Frame Delimiter (SFD) “5D” and remains asserted until the end of the packet.
Figure 9. Clocking for Link Down Clock Transition
Any
Clock
2.5 MHz
Clock
Clock transition time does not exceed
2X the nominal clock period:
10 Mbps = 2.5 MHz
100 Mbps = 25 MHz
Link-Down Condition/Auto-Negotiate Enabled
RX_CLK
TX_CLK
B3503-01
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