参数资料
型号: WBLXT975BHCA8
厂商: CORTINA SYSTEMS INC
元件分类: 网络接口
英文描述: DATACOM, ETHERNET TRANSCEIVER, PQFP160
封装: ROHS COMPLIANT, PLASTIC, MS-002DD-1, HQFP-160
文件页数: 15/76页
文件大小: 1004K
代理商: WBLXT975BHCA8
LXT974/LXT975 — Fast Ethernet 10/100 Quad Transceivers
22
Datasheet
Transmit Clock
The LXT974/975 is the master clock source for data transmission. The LXT974/975 automatically
sets the speed of TX_CLK to match port conditions. If the port is operating at 100 Mbps, TX_CLK
is set to 25 MHz. If the port is operating at 10 Mbps, TX_CLK is set to 2.5 MHz. The transmit data
and control signals must always be synchronized to TX_CLK by the MAC. The LXT974/975
normally samples these signals on the rising edge of TX_CLK.
However, Advanced TX_CLK Mode is available by setting MII register bit 19.5=1. In this mode,
the LXT974/975 samples the transmit data and control signals on the falling edge of TX_CLK.
When operating under MDIO Control, the user can advance the transmit clock relative to
TXD<3:0> and TX_ER. When Advance TX_CLK Mode is selected, the LXT974/975 clocks TXD
data in on the falling edge of TX_CLK, instead of the rising edge. This mode provides an increase
in timing margins of TXD, relative to TX_CLK. Advance TX_CLK Mode is enabled when bit 19.5
= 1.
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 bit of the packet.
Receive Data Valid
The LXT974/975 asserts RX_DV when it receives a valid packet. Timing changes depend on line
operating speed:
For 100TX and 100FX links, RX_DV is asserted from the first nibble of preamble to the last
nibble of the data packet.
For 10BT 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.
Error Signals
Whenever the LXT974/975 receives an errored symbol from the network, it asserts RX_ER and
drives “1110” on the RXD pins.
When the MAC asserts TX_ER, the LXT974/975 drives “H” symbols out on the line.
Figure 6. MII Data Interface
LX T9 7 4 /9 75
M e d ia A cce ss
C o ntro ller
MA C
RX _ C L K n
RX D< 3 :0 > n
RX _ D V n
RX _ E R n
TX _C LK n
TXD < 3:0 > n
TX_EN n
TX_ER n
CR S n
CO L n
相关PDF资料
PDF描述
WBLXT974BHCA8 DATACOM, ETHERNET TRANSCEIVER, PQFP160
WBLXT974BHCA8 DATACOM, ETHERNET TRANSCEIVER, PQFP160
WBLXT9785EHC.C2V DATACOM, INTERFACE CIRCUIT, PQFP208
WBLXT9785EHC.D0-865110 DATACOM, INTERFACE CIRCUIT, PQFP208
WBLXT9785EHC.D0-865111 DATACOM, INTERFACE CIRCUIT, PQFP208
相关代理商/技术参数
参数描述
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