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TNETX4090
ThunderSWITCH II
9-PORT 100-/1000-MBIT/S ETHERNET
SWITCH
SPWS044E – DECEMBER 1997 – REVISED AUGUST 1999
72
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
LED interface
LED (see Figure 29)
NO. MIN MAX UNIT
1 t
c(LED_CLK)
Cycle time, LED_CLK 8 t
c
2 t
w(LED_CLK)
Pulse duration, LED_CLK high 4 t
c
3 t
n(LED_CLK)
Number of LED_CLK pulses in burst 24
†
4 t
c(BURST)
Cycle time, LED_CLK burst 4687488
‡
t
c
5 t
su(LED_DATA
)
Setup time, LED_DATA before LED_CLK↑ 4 t
c
6 t
h(LED_DATA)
Hold time, LED_DATA after LED_CLK↑ 4 t
c
†
During hard reset, LED_CLK runs continuously.
‡
Does not apply during hard reset
First LED Second LED Last LED First LED
5
6
2
1
3
4
LED_CLK
LED_DATA
Figure 29. LED