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DP83847 Datasheet(PDF) 57 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # DP83847
Description  DsPHYTER II ??Single 10/100 Ethernet Transceiver
PDF  60 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83847 Datasheet(HTML) 57 Page - National Semiconductor (TI)

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6.6 Loopback Timing
6.6.1 100 Mb/s Internal Loopback Mode
Note1: Due to the nature of the descrambler function, all 100BASE-TX Loopback modes will cause an initial “dead-time”
of up to 550
µs during which time no data will be present at the receive MII outputs. The 100BASE-TX timing specified is
based on device delays after the initial 550
µs “dead-time”.
Note2: Measurement is made from the first rising edge of TX_CLK after assertion of TX_EN.
Parameter
Description
Notes
Min
Typ
Max
Units
T6.1.1
TX_EN to RX_DV Loopback
100 Mb/s internal loopback mode
240
ns
TX_CLK
TX_EN
TXD[3:0]
CRS
RX_CLK
RXD[3:0]
RX_DV
T6.1.1



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