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參數(shù)資料
| 型號： | AM79C982-8JC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | basic Integrated Multiport Repeater (bIMR) |
| 中文描述： | DATACOM, ETHERNET TRANSCEIVER, PQCC84 |
| 封裝： | PLASTIC, LCC-84 |
| 文件頁數(shù)： | 23/26頁 |
| 文件大?。?/td> | 254K |
| 代理商： | AM79C982-8JC |
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AMD
PRELIMINARY
1–25
Am79C982
Note:
When used in minimum mode.
19406B-13
X1
RST
SHCK
1
2
12
16
20
CRS
AUI
TP1
TP0
24
28
32
10
TP3
TP2
STR
AUI
TP1
TP0
TP3
TP2
SO
(Note)
AUI
AUI
Figure 6. bIMR4 Management Port Minimum Mode and Port Activity Monitor Signal Relationship
Port Activity Monitor
Two pins, CRS and STR, are used to serially output the
state of the internal Carrier Sense signals from the AUI
and the eight (four) TP ports. This function together with
external hardware and/or software can be used to moni-
tor repeater receive and/or collision activity.
The resolution of the CRS signal is 2 ms. The incoming
data is sampled repeatedly during each 2 ms period. If
any activity occurs (regardless of length) during any
2 ms period, this activity will be latched. At the start of
the next 2 ms period, the bIMR device will examine the
latches for each port. For any port in which activity
occurred, the corresponding bit in the CRS output
stream will remain set for the 2 ms period. This means
that during any 2 ms time interval the CRS output bit
stream represents carrier activity that occurred in the
preceding 2 ms period (see Figure 7). During the last
1000 ns of the 2 ms period, the CRS signal is reset to
LOW. Figure 7 illustrates this by showing the output of
the register in the recommended LED drive circuitry of
Figure 8.
The CRS pin is used to indicate carrier sense for all nine
ports of the device (five for the Am79C982-4). This pin
outputs a ten bit stream that repeats every microsecond.
During this period there are ten bit times (100 ns). Each
port has a “time slot” in this repeating bit stream (see
Figure 4). For example, activity on the AUI port is repre-
sented by the state of the CRS pin during the second
100 ns period of the one microsecond cycle.
Because the one microsecond sequence is repeated
unchanged for most of the longer 2 ms cycle, any LED
driven by the latch and shift register shown in Figure 3
and 5 will remain on for at least 2 ms. This minimizes the
need for external pulse stretching logic.
1000 ns
2 ms
TPX
or AUI
CRS
19406B-14
Figure 7. Carrier Sense Signal Output Corresponding to the
States of AUI or Twisted-Pair Port Activity
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| AM79C983AKC | Integrated Multiport Repeater 2 (IMR2⑩) |
| AM79C984 | enhanced Integrated Multiport Repeater (eIMR⑩) |
| AM79C984A | enhanced Integrated Multiport Repeater (eIMR⑩) |
| AM79C984AJC | enhanced Integrated Multiport Repeater (eIMR⑩) |
| AM79C984AKCW | Circular Connector; No. of Contacts:6; Series:MS27474; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:8; Circular Contact Gender:Pin; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:8-35 RoHS Compliant: No |
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| AM79C983 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Am79C983 Datasheet? 348KB (PDF) Integrated Multiport Repeater 2 IMR2 ? |
| AM79C983A | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Integrated Multiport Repeater 2 (IMR2⑩) |
| AM79C983AKC | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Integrated Multiport Repeater 2 (IMR2⑩) |
| AM79C983AKCW | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Integrated Multiport Repeater 2 (IMR2⑩) |
| AM79C983ASKC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN Hub Controller |
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