VELOCITYTM
VITESSE
SEMICONDUCTOR CORPORATION
10-Bit Transceiver for Fibre
Channel and Gigabit Ethernet
Figure 6: REFCLK Timing Waveforms
TL
TH
REFCLK
TR
TF
Data Sheet
VSC7123
VIH(MIN)
VIL(MAX)
Table 4: Reference Clock Requirements
Parameter
Description
FR
Frequency Range
FO
DC
TR,TF
Frequency Offset
REFCLK duty cycle
REFCLK rise and fall time
Min Max Units
Conditions
Range over which both transmit and
98 136 MHz receive reference clocks on any link may
be centered.
Maximum frequency offset between
-200 200 ppm transmit and receive reference clocks on
one link.
35
65
% Measured at 1.5V
—
1.5
ns
Between VIL(MAX) and VIH(MIN)
Page 8
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
G52212-0, Rev 4.3
03/25/01