Texas Instruments THUNDER TNETX3270 User Manual
Page 62
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
tc(LEDCLK)
Cycle time, LEDCLK
96
ns
2
tw(LEDCLKH)
Pulse duration, LEDCLK high
38
58
ns
3
Number of LEDCLK pulses in burst
48†
4
tc(BURST)
Cycle time, LEDCLK burst
62
ms
5
td(LEDCLK)
Delay time, from LEDDATA to LEDCLK
↑
12
µ
s
6
td(LEDDATA)
Delay time, from LEDCLK
↑
to LEDDATA (1st LED invalid)
84
µ
s
† 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