1894K-40LFT IDT, 1894K-40LFT Datasheet - Page 47

• Manufacturer Part Number: 1894K-40LFT
• Description: Ethernet ICs 3.3V 10/100 PHY RMII
• Manufacturer: IDT

Specifications of 1894K-40LFT

• Rohs: yes
• Part # Aliases: ICS1894K-40LFT

10Base-T: Heartbeat Timing (SQE)
10Base-T Heartbeat (SQE) Timing Diagram
IDT® 10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE
ICS1894-40
10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE
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:
•
•
•
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.
TXEN
TXCLK
COL
Period
Time
TXEN
TXCLK
COL
t1
t2
COL Heartbeat Assertion Delay from
TXEN De-Assertion
COL Heartbeat Assertion Duration
Parameter
t1
10Base-T Half Duplex
10Base-T Half Duplex
Conditions
t2
47
Min.
–
–
Typ.
1000
850
ICS1894-40
Max. Units
1500
1500
PHYCEIVER
ns
ns
REV K 022412