8.0 Electrical Specifications (Continued)
8.9 Reset Timing
8.9.1 Hardware Reset Timing
Parameter
Description
Notes
Min
500
1
Typ Max Units
T1
T2
T3
Internal Reset Time
µs
µs
µs
Hardware RESET Pulse Width
Post Reset Stabilization time
prior to MDC preamble for
register accesses
MDIO is pulled high for 32 bit serial
management initialization
500
T4
T5
Hardware Configuration Latch- Hardware Configuration Pins are
in Time from the Deassertion of described in section 3.10
Reset (either soft or hard)
800
800
ns
ns
Hardware Configuration pins
transition to output drivers
It is important to choose pull-up and/or
pull-down resistors for each of the
hardware configuration pins that provide
fast RC time constants in order to latch-in
the proper value prior to the pin
transitioning to an output driver
Note: Software Reset should be initiated no sooner then 500µs after power-up or the deassertion of hardware reset.
Note: The timing for Hardware Reset Option 2 is equal to parameter T1 plus parameter T2 (501µs total).
Vcc
T2
T3
T1
Hardware
Reset (option #1)
Hardware
Reset (option #2)
32 clocks
MDC
T4
Latch-In of Hardware
Configuration Pins
T5
input
output
Dual Function Pins
Become Enabled As Outputs
Version A
86
TI [ TEXAS INSTRUMENTS ]
