AM7996 查看數據表（PDF） - Advanced Micro Devices
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AM7996 Datasheet PDF : 18 Pages
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AMD
APPLICATIONS
The Am7996 is compatible with Ethernet Version 2 and
IEEE 802.3 10BASE5 and 10BASE2 applications. (See
Figure 1).
Ethernet
Local
CPU
Local
Memory
Am7990
LANCE
Local Bus
AUI - Attachment Unit Interface
DTE - Data Terminal Equipment
MAU - Media Access Unit
Cheapernet
Local
CPU
Local
Memory
Am7990
LANCE
MAU
DTE
AUI
Cable
Am7992B
SIA
Tap
Am7996
Transceiver
Power
Supply
DTE
Am7992B
SIA
Am7996
Transceiver
Ethernet
Coax
RG58
BNC "T"
Local Bus
Power
Supply
Figure 1. Typical Ethernet Node
07506E-4
Table 1. Transmit Mode Collision Detect
Function Table
MAU
Mode of Operation
Transmitting
Number of Transmitters
<2
=2
>2
No
Yes
Yes
Not Transmitting
No
May
Yes
Table 3. Receive Mode Collision Detect
Function Table
MAU
Mode of Operation
Transmitting
Number of Transmitters
<2
=2
>2
No
Yes
Yes
Not Transmitting
No
Yes
Yes
Table 2. IEEE 802.3 Recommended Transmit
Mode Collision Detect Thresholds
IEEE 802.3
10BASE5, Ethernet
Threshold Voltage Level
No Detect Must Detect
–1.492 V
–
10BASE2, Cheapernet
–1.404 V
–1.782 V
Table 4. IEEE 802.3 Recommended Receive
Mode Collision Detect Thresholds
IEEE 802.3
10BASE5, Ethernet
Threshold Voltage Level
No Detect Must Detect
–1.492 V
–1.629 V
10BASE2, Cheapernet
–1.404 V
–1.581 V
6
Am7996
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