am7996 Advanced Micro Devices, am7996 Datasheet - Page 6

• Manufacturer Part Number: am7996
• Description: Ieee 802.3/ethernet/cheapernet Transceiver
• Manufacturer: Advanced Micro Devices

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