ICS1893 Integrated Circuit Systems, ICS1893 Datasheet - Page 145

• Manufacturer Part Number: ICS1893
• Description: 3.3-V 10Base-T/100Base-TX Integrated PHYceiver
• Manufacturer: Integrated Circuit Systems

10.5.19 10Base-T: Heartbeat Timing (SQE)
ICS1893 Rev C 6/6/00
Table 10-26
The time periods consist of timings of signals on the following pins:
•
•
•
Figure 10-20
Note:
1. For more information on 10Base-T SQE operations, see
2. In 10Base-T mode, one bit time = 100 ns.
Table 10-26. 10Base-T Heartbeat (SQE) Timing
Figure 10-20.
TXEN
TXCLK
COL
Period
Time
TXEN
TXCLK
COL
ICS1893 - Release
t1
t2
Test”
.
COL Heartbeat Assertion Delay from
TXEN De-Assertion
COL Heartbeat Assertion Duration
lists the significant time periods for the 10Base-T heartbeat (that is, the Signal Quality Error).
shows the timing diagram for the time periods.
10Base-T Heartbeat (SQE) Timing Diagram
Parameter
Copyright © 2000, Integrated Circuit Systems, Inc.
All rights reserved.
t1
145
10Base-T Half Duplex
10Base-T Half Duplex
Conditions
Section 7.5.10, “ 10Base-T Operation: SQE
t2
Chapter 10 DC and AC Operating Conditions
Min.
–
–
1000
Typ.
850
Max.
1500
1500
June, 2000
Units
ns
ns