dp83846a National Semiconductor Corporation, dp83846a Datasheet - Page 57

• Manufacturer Part Number: dp83846a
• Description: Dsphyter ? Single 10/100 Ethernet Transceiver
• Manufacturer: National Semiconductor Corporation

6.7 Loopback Timing
Note: Due to the nature of the descrambler function, all 100BASE-TX Loopback modes will cause an initial “dead-time”
of up to 550 s 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 s “dead-time”.
Note: Measurement is made from the first rising edge of TX_CLK after assertion of TX_EN.
T7.0.1
Parameter
RXD[3:0]
TXD[3:0]
TX_CLK
RX_CLK
TX_EN to RX_DV Loopback
TX_EN
RX_DV
CRS
Description
T7.0.1
100 Mb/s internal loopback mode
10 Mb/s internal loopback mode
57
Notes
Min
Typ
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Max
240
2
Units
ns
s