dp83848qsqx/nopb National Semiconductor Corporation, dp83848qsqx/nopb Datasheet - Page 65

• Manufacturer Part Number: dp83848qsqx/nopb
• Description: Phyter Extended Temperature Single Port 10/100 Mb/s Ethernet Physical Layer Transceiver
• Manufacturer: National Semiconductor Corporation

T2.23.1
T2.23.2
T2.24.1
Parameter
Parameter
15.2.23 100BASE-TX Signal Detect Timing
Note: The signal amplitude on PMD Input Pair must be TP-PMD compliant.
15.2.24 100 Mb/s Internal 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 µs during which time no data
Note: Measurement is made from the first rising edge of TX_CLK after assertion of TX_EN.
will be present at the receive MII outputs. The 100BASE-TX timing specified is based on device delays after the initial 550µs “dead-time”.
SD Internal Turn-on Time
SD Internal Turn-off Time
TX_EN to RX_DV Loopback
Description
Description
100 Mb/s internal loopback mode
Notes
Notes
65
Min
Min
Typ
Typ
30152543
30152542
Max
350
1
Max
240
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Units
Units
ms
µs
ns