AM79C984 datasheet(19/44 Pages) AMD

tên linh kiện	AM79C984

Giải thích chi tiết về linh kiện	enhanced Integrated Multiport Repeater (eIMR??

PDF	44 Pages

Scroll/Zoom	100%

nhà sản xuất	AMD [Advanced Micro Devices]

Trang chủ	http://www.amd.com

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19 / 44 page

P R E L I M I N A R Y

Am79C984A

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

>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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