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TNETX3270
ThunderSWITCH 24/3 ETHERNET SWITCH
WITH 24 10-MBIT/S PORTS AND 3 10-/100-MBIT/S PORTS
SPWS043B – NOVEMBER 1997 – REVISED APRIL 1999
62
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
LED interface
operating characteristics over recommended operating conditions (see Figure 22)
NO. PARAMETER MIN MAX UNIT
1 t
c(LEDCLK)
Cycle time, LEDCLK 96 ns
2 t
w(LEDCLKH)
Pulse duration, LEDCLK high 38 58 ns
3 Number of LEDCLK pulses in burst 48
†
4 t
c(BURST)
Cycle time, LEDCLK burst 62 ms
5 t
d(LEDCLK)
Delay time, from LEDDATA to LEDCLK↑ 12 µs
6 t
d(LEDDATA)
Delay time, from LEDCLK↑ to LEDDATA (1st LED invalid) 84 µs
†
During hard reset, LEDCLK runs continuously.
LEDCLK
(output)
LEDDATA
(input/output)
5
2
6
1
3
4
First LED Second LED Last LED First LED
Figure 22. LED