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TNETX4090
ThunderSWITCH II
9-PORT 100-/1000-MBIT/S ETHERNET
SWITCH
SPWS044E – DECEMBER 1997 – REVISED AUGUST 1999
65
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PMA and GMII clock (see Figure 20)
NO. MIN MAX UNIT
1 t
r(Mxx_GCLK)
Pulse width low, Mxx_RFCLK 2.5 ns
2 t
h(Mxx_GCLK)
Pulse width high, Mxx_RFCLK 2.5 ns
3 t
w(Mxx_GCLK)
Cycle time, Mxx_RFCLK 8 ns
PMA and GMII clock (see Figure 20)
NO. MIN MAX UNIT
1 t
r(Mxx_GCLK)
Rise time, Mxx_RFCLK 1 ns
2 t
f(Mxx_GCLK)
Fall time, Mxx_RFCLK 1 ns
3 Accuracy 100 PPM
duty cycle 40% 60%
†
tr and tf are measured between 20% and 80%, V
DD(3.3-V)
= min, output load (GTCLK) = 20pf.
Mxx_RFCLK
1 2
3
Figure 20. GMII Clock