S2046/S2047
GIGABIT ETHERNET CHIPSET
Table 14. RCLKN Timing Table
2
Comments
Parameter
Symbol
Min.
Max.
Units
Frequency
62.50 MHz
125.0 MHz
f
62.49375 62.50625
124.9875 125.0125
MHz
This is dependent on
the data path width.
2
Period in Lock
t
TBD
TBD
ns
ns
In frequency lock .
p
Out of Lock Period
(f=62.50 MHz)
t
t
Not in frequency lock.
oolp
t
3.2
3.2
ns
ns
RCLKN Low Time
RCLKN High Time
RCLKN Duty Cycle
low
high
40%
2.1
60%
period
ns
In frequency lock.
RX Setup to RCLKN
t
s
RX Hold from RCLKN
RCLK/RCLKN Rise Time
RCLKN Fall Time
t
6.3
0.75
0.7
ns
ns
ns
h
This applies to the
RCLKN output.
t
2.4
3.0
r
This applies to the
RCLKN output.
t
f
1. All parameters are for outputs driven into a 35 pf lumped capacitive load.
2.This is the absolute minimum RCLKN period while in frequency lock and must account for any
adjustments to the clock to allow for a change in phase or frequency on the received serial link.
May 16, 2000 / Revision NC
19
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
