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參數(shù)資料
| 型號： | AM79C985KCW |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 網(wǎng)絡(luò)接口 |
| 英文描述： | enhanced Integrated Multiport Repeater Plus (eIMR+⑩) |
| 中文描述： | DATACOM, ETHERNET TRANSCEIVER, PQFP100 |
| 封裝： | PLASTIC, QFP-100 |
| 文件頁數(shù)： | 47/48頁 |
| 文件大小： | 260K |
| 代理商： | AM79C985KCW |
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Am79C985
A-1
Appendix A
Security
EAVESDROP PROTECTION
The eIMR+/HIMIB devices are capable of providing
network eavesdrop protection. This feature is protected
by a software key. An application note containing the
necessary software key and implementation details is
available from AMD. A brief description of eavesdrop
protection is given below. For more information, contact
your local AMD sales representative.
FEATURES SUMMARY
Eavesdrop protection is based on the concept that con-
fidential data should only be received by specified se-
cure stations. The eIMR+/HIMIB devices are capable of
repeating packets only to ports considered secure for a
packet’s destination address. On all other ports, trans-
mission can be disrupted by transmitting a pattern of
alternating 1s and 0s.
The eIMR+/HIMIB can disrupt packet transmission, as
described above, on ports not having a valid address.
Valid addresses are determined by comparing a
packet’s destination address with the two address reg-
isters associated with each repeater port: Last Source
Address Register and Preferred Source Address Reg-
ister. Eavesdrop protection can be masked on a port-
by-port basis. Disruption of multicast packets can also
be masked on a port-by-port basis. If the destination
address is a broadcast address, the packet is transmit-
ted unmodified on all ports.
In many instances, a station targeted with a specific
destination address will not reside within the same re-
peater as the originating station. To ensure that packets
arrive at the intended destination, eIMR+/HIMIB ports
can be programmed to pass packets with an invalid des-
tination address undisturbed if no other port on the re-
peater has a valid address that matches the destination
address. The eIMR+/HIMIB devices can determine if
there is a match on the repeater by monitoring its ports
and by monitoring signals on the eIMR+/HIMIB expan-
sion bus.
Figure A1.
STR Input Signal from Am79C987 HIMIB Device
AUI
TP0
TP1
TP2
TP3
TP4
TP5
TP6
TP7
CLK
TCLK
STR
Note:
TCLK illustrates internal eIMR+ chip clock phase relationship.
20651B-34
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AM79C987 | Hardware Implemented Management Information Base (HIMIB) Device |
| AM79C987JC | Hardware Implemented Management Information Base (HIMIB) Device |
| AM79C987JCB | Hardware Implemented Management Information Base (HIMIB) Device |
| AM79C988A | IC,Motor Controller,CMOS,SOP,8PIN |
| AM79C988 | Quad Integrated Ethernet Transceiver (QuIET⑩) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C985WW WAF | 制造商:Advanced Micro Devices 功能描述: |
| AM79C987 | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Hardware Implemented Management Information Base (HIMIB) Device |
| AM79C987JC | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Hardware Implemented Management Information Base (HIMIB) Device |
| AM79C987JCB | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Hardware Implemented Management Information Base (HIMIB) Device |
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