dp83840a National Semiconductor Corporation, dp83840a Datasheet - Page 79

• Manufacturer Part Number: dp83840a
• Description: 10/100 Mb/s Ethernet Physical Layer
• Manufacturer: National Semiconductor Corporation

Version A
8.0 Electrical Specifications
8.6 10 Mb/s AC Timing
8.6.1 10 Mb/s Transmit Timing (Start of Packet)
Note: 1 bit time = 100ns in 10 Mb/s mode for both nibble and serial operation.
Parameter
T1
T2
T3
T4
TX_CLK
TX_EN
TXU+/-
TXS+/-
Transmit Enable Setup Time from
the Rising Edge of TXC
Transmit Data Setup Time from
the Rising Edge of TXC
Transmit Data Hold Time from the
Rising Edge of TXC
Transmit Latency (Rising Edge of
TXC to TXU+/-)
TXD
Description
(Continued)
T1
T2
10 Mb/s nibble mode
10 Mb/s serial mode
10 Mb/s nibble mode
10 Mb/s serial mode
10 Mb/s nibble mode
10 Mb/s serial mode
10 Mb/s nibble mode
10 Mb/s serial mode
T4
79
T3
Notes
Min
20
20
20
20
-2
-2
Typ
Max
6.8
2.5
ns
ns
ns
ns
ns
ns
bits
bits
Units