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參數(shù)資料
| 型號： | AM79C983AKC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | Integrated Multiport Repeater 2 (IMR2⑩) |
| 中文描述： | DATACOM, ETHERNET TRANSCEIVER, PQFP132 |
| 封裝： | PLASTIC, QFP-132 |
| 文件頁數(shù)： | 48/60頁 |
| 文件大小： | 348K |
| 代理商： | AM79C983AKC |
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48
Am79C983A
P R E L I M I N A R Y
Figure 10. PR Port Connection to an Am79C90 C-Lance
Port Switching
Port switching allows the movement of individual ports
between multiple Ethernet collision domains via soft-
ware. This capability enables the network manager to
optimize network performance by dynamically balanc-
ing the loads on a network. As an example, a port ex-
hibiting a high level of activity can be moved to a less
congested collision domain.
The method of implementing port switching with the
IMR2/QuIET chip set is to connect a single transceiver
port to multiple IMR2 devices. The number of IMR2 de-
vices will equal the number of backplanes supported in
the hub. 11 is a simplified schematic showing a hub
with three separate backplanes. Only one QuIET de-
vice is shown for simplicity, although it is expected that
most applications will use three QuIET devices to en-
able 12 port multiples.
The following discussion of port switching will con-
sider only port 0; although, it is equally applicable to
all of the ports. At any time, PAUI
and only one, IMR2 device. As a result, port 0 is trans-
ferred to whichever IMR2 device has PAUI
[
0
]
is enabled on one,
[
0
]
enabled.
The other two IMR2 devices will have PAUI
disabled with PDO
[
0
]
in a high impedance state. To
move port 0 to another backplane, the software will
disable PAUI
[
0
]
on the active IMR2 device and enable
PAUI
[
0
]
on the targeted IMR2 device that represents
the desired backplane. Pseudo AUI ports can be
disabled or enabled by setting the appropriate bit in
the Port Switching Control Register.
[
0
]
Although there are multiple IMR2 devices, only one has
management control of the QuIET devices. 11 shows
IMR2 device 0 having management control. The other
two devices do not have any control over the configura-
tion of the QuIET devices.
The number of IMR2 devices that can be connected to-
gether is limited by the load on the PAUI drivers. The
PAUI will operate reliably with a load up to 100 pF. On
a system that uses sockets for the IMR2 devices, the
maximum number of devices is six. This number can in-
crease as long as the total load capacitance is kept
below 100 pF.
COL
JAM
MACEN
DAT
4.9 k
+5 V
ECLK
Clock
Generator
CLSN
RCLK
RX
RENA
TENA
TX
TCL
Am79C90 (C-LANCE)
PCLK
PDRV
PDAT
PENAI
PENAO
19879B-14
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| AM79C984A | enhanced Integrated Multiport Repeater (eIMR⑩) |
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| 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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| AM79C983KC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN Hub Controller |
| AM79C983SKC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LAN Hub Controller |
| AM79C984 | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:enhanced Integrated Multiport Repeater (eIMR⑩) |
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