ICS1894-40
10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE
PHYCEIVER
10Base-T: Heartbeat Timing (SQE)
The table below lists the significant time periods for the 10Base-T heartbeat (that is, the Signal Quality Error). The
time periods consist of timings of signals on the following pins:
• TXEN
• TXCLK
• COL
The 10Base-T Heartbeat (SQE) Timing Diagram shows the timing diagram for the time periods.
Note:
1. For more information on 10Base-T SQE operations, see the section “10Base-T Operation: SQE Test”.
2. In 10Base-T mode, one bit time = 100 ns.
Time
Parameter
Conditions
Min. Typ. Max. Units
Period
t1
t2
COL Heartbeat Assertion Delay from
TXEN De-Assertion
10Base-T Half Duplex
10Base-T Half Duplex
–
–
850
1500
ns
ns
COL Heartbeat Assertion Duration
1000 1500
10Base-T Heartbeat (SQE) Timing Diagram
TXEN
TXCLK
COL
t1
t2
IDT® 10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE
47
ICS1894-40
REV G 060110
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
