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參數(shù)資料
| 型號： | AM79C90 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | CMOS Local Area Network Controller for Ethernet (C-LANCE) |
| 中文描述： | 的CMOS局域網(wǎng)控制器（丙應(yīng)聘以太網(wǎng)） |
| 文件頁數(shù)： | 18/62頁 |
| 文件大小： | 437K |
| 代理商： | AM79C90 |
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AMD
P R E L I M I N A R Y
1
8
Am79C90
Differences Between Ethernet Versions 1
and 2
a. Version 2 specifies that the collision detect of the
transceiver must be activated during the inter-
packet gap time.
b. Version 2 specifies some network management
functions, such as reporting the occurrence of colli-
sions, retries and deferrals.
c. Version 2 specifies that when transmission is ter-
minated, the differential transmit lines are driven to
0 volt differentially (half step).
Differences Between IEEE 802.3 and
Ethernet
a. IEEE 802.3 specifies a 2-byte length field rather
than a type field. The length field (802.3) describes
the actual amount of data in the frame.
b. IEEE 802.3 allows the use of a PAD field in the
data section of a frame, while Ethernet specifies
the minimum packet size at 64 bytes. The use of a
PAD allows the user to send and receive packets
which have less than 46 bytes of data.
A list of significant differences between Ethernet and
IEEE 802.3 at the physical layer include the following:
IEEE 802.3
Half Step
Ethernet
Full Step (Rev 1)
or
Half Step (Rev 2)
0 – +5 V
1.6 mA
±
40%
End of Transmission
State
Common Mode Voltage
Common Mode Current Less than 1 mA
Receive
±
, Collision
±
Input Threshold
Fault Protection
±
5.5 V
±
160 mV
16 V
±
175 mV
0 V
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| AM79C90PCTR | CMOS Local Area Network Controller for Ethernet (C-LANCE) |
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