參數(shù)資料
型號: AM79C984AJC
廠商: ADVANCED MICRO DEVICES INC
元件分類: 網(wǎng)絡(luò)接口
英文描述: enhanced Integrated Multiport Repeater (eIMR⑩)
中文描述: DATACOM, ETHERNET TRANSCEIVER, PQCC84
封裝: PLASTIC, LCC-84
文件頁數(shù): 19/44頁
文件大小: 222K
代理商: AM79C984AJC
P R E L I M I N A R Y
Am79C984A
19
Figure 2. Network Activity Display
Table 3 shows ACT
0-7
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[2]
ACT[3]
ACT[4]
ACT[5]
ACT[6]
ACT[7]
eIMR
LED
Interface
V
DD
20650A-7
Table 3. Network Utilization
Number of LEDs
Lit by ACT
7-0
8
7
6
5
4
3
2
1
Percentage Utilization
>80%
>64%
>32%
>16%
>8%
>4%
>2%
>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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