AM79C873 Advanced Micro Devices, AM79C873 Datasheet - Page 38

• Manufacturer Part Number: AM79C873
• Description: NetPHY -1 10/100 Mbps Ethernet Physical Layer Single-Chip Transceiver with 100BASE-FX Support
• Manufacturer: Advanced Micro Devices

10BASE-T SQE (Heartbeat) Timing
10BASE-T SQE (Heartbeat) Timing Parameters
10BASE-T Jab and Unjab Timing
10BASE-T Jab and Unjab Timing Parameters
38
Symbol
Symbol
t1
t2
t1
t2
TX_CLK
TX_EN
TX_EN
TDX
COL
COL
COL (SQE) Delay After TX_EN Off
COL (SQE) Pulse Duration
Maximum Transmit Time
Unjab Time
Parameter
Parameter
Figure 12. 10BASE-T SQE (Heartbeat) Timing Diagram
Figure 13. 10BASE-T Jab and Unjab Timing Diagram
t
1
P R E L I M I N A R Y
t
Am79C873
1
Conditions
Conditions
t
2
t
2
0.65
250
Min
Min
0.5
20
Typical
Typical
505
1.3
1.1
48
1500
Max
Max
150
1.6
1.5
22164A-14
22164A-15
Unit
Unit
ms
ms
ms
ms