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AM79C984 датащи(PDF) 19 Page - Advanced Micro Devices

номер детали AM79C984
подробное описание детали  enhanced Integrated Multiport Repeater (eIMR??
PDF  44 Pages
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производитель  AMD [Advanced Micro Devices]
домашняя страница  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C984 датащи(HTML) 19 Page - Advanced Micro Devices

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P R E L I M I N A R Y
Am79C984A
19
Figure 2. Network Activity Display
Table 3 shows ACT0-7 as a function of the percentage
of network utilization. The table uses a scale that is
more sensitive at low utilization levels. 100% utilization
represents the maximum number of events that could
occur in a given window of time.
The update rate and corresponding internal sampling
window for ACT[7:0] is 250 ms. During this sampling
window, a counter is used to count the number of times
repeater transmit activity is TRUE. The counter uses a
free-running clock which has the granularity to detect
the minimum packet size of 96 bit times.
Figure 3 shows the timing relationship between the
sampling window, counting clock, and transmit activity.
Figure 3. Activity Sampling
ACT[0]
ACT[1]
ACT[4]
ACT[5]
ACT[2]
ACT[3]
ACT[6]
ACT[7]
eIMR
LED
Interface
VDD
20650A-7
Table 3. Network Utilization
Number of LEDs
Lit by ACT7-0
Percentage Utilization
8
>80%
7
>64%
6
>32%
5
>16%
4
>8%
3
>4%
2
>2%
1
>1%
Sampling
Window
Counting
Clock
Xmit
Activity
counter is active
next counting cycle
latch data;
update display;
clear counter
20650B-8



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