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參數(shù)資料
| 型號： | AM79C982 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | basic Integrated Multiport Repeater (bIMR) |
| 中文描述： | 基本綜合多端中繼器（bIMR） |
| 文件頁數(shù)： | 14/26頁 |
| 文件大?。?/td> | 254K |
| 代理商： | AM79C982 |
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AMD
PRELIMINARY
1–16
Am79C982
Implementing a 12-Port Unmanaged Hub
Both bIMR4 and bIMR8 chips have an expansion bus
that allows multiple devices to be connected together,
allowing high port count repeaters to be designed. The
operation of the expansion bus is identical for the bIMR4
and bIMR8. Minimum Mode is available in both bIMR4
and bIMR8 devices. This mode facilitates the
implementation of the LED display for unmanaged hub.
Figure 2 shows a simple example where one four port
bIMR device and one eight port bIMR device are con-
nected together to form one twelve port logical
unmanaged repeater. As both devices are on the same
board the arbiter function can be local, and the bus
transceivers shown at right in Figure 1 are not
necessary due to the low bus loading in this example. In
this case, the arbiter simply asserts
ACK
if one
REQ
sig-
nal is asserted and
COL
if both
REQ
signals
are as-
serted. The arbiter does not assert either signal if neither
REQ is asserted. Note that both
ACK
and
COL
are logic
low when asserted.
The D type flip flop is used to synchronize the reset
signals to both bIMR devices in order to ensure that the
internal 10 MHz clocks of these devices are in phase.
More complex repeaters, including stackable hubs, may
be built using the bIMR family. In these cases, the bus
transceivers may be necessary and the arbitration may
be distributed throughout the system.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AM79C982-4JC | basic Integrated Multiport Repeater (bIMR) |
| AM79C982-8JC | basic Integrated Multiport Repeater (bIMR) |
| AM79C983AKC | Integrated Multiport Repeater 2 (IMR2⑩) |
| AM79C984 | enhanced Integrated Multiport Repeater (eIMR⑩) |
| AM79C984A | enhanced Integrated Multiport Repeater (eIMR⑩) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C982-4JC | 制造商:Advanced Micro Devices 功能描述:LAN HUB CONTROLLER, 84 Pin, PLCC |
| AM79C982-8JC | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:basic Integrated Multiport Repeater (bIMR) |
| 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) |
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