DP83840A Datasheet, PDF (88/89 Pages) National Semiconductor (TI) – 10/100 Mb/s Ethernet Physical Layer

8.0 Electrical Specifications
8.10.2 Remote Loopback
Parameter
Description
T1
Remote Loopback
Notes
100 Mb/s only
Min Typ Max Units
25 ns
RD+/-
TD+/-
Remote Loopback Timing
IDLE
IDLE
Start of Packet
T1
Start of Packet
8.11 Isolation Timing
8.11.1 PHY Isolation Timing
Parameter
Description
T1
From software clear of bit 10 in
the BMCR register to the
transition from Isolate to Normal
Mode
T2
From Deassertion of S/W or H/W
Reset to transition from Isolate to
Normal mode
Clear bit 10 of BMCR
(return to normal operation
from Isolate mode)
H/W or S/W Reset
(with PHYAD = 00000)
Mode
Notes
Min Typ Max Units
100 µs
500 µs
T1
T2
Isolate
Normal
Version A
88