ICS1892 Integrated Circuit Systems, ICS1892 Datasheet - Page 141

• Manufacturer Part Number: ICS1892
• Description: 10Base-T/100Base-TX Integrated PHYceiver
• Manufacturer: Integrated Circuit Systems

10.5.18 10Base-T: Heartbeat Timing (SQE)
ICS1892, Rev. D, 2/26/01
TXEN
TXCLK
COL
Table 10-25
which consists of timings of signals on the TXEN, TXCLK, and COL pins).
diagram for the time periods.
Note:
1. For more information on 10Base-T SQE operations, see
2. In 10Base-T mode, one bit time = 100 ns.
Table 10-25. 10Base-T Heartbeat (SQE) Timing
Figure 10-18. 10Base-T Heartbeat (SQE) Timing Diagram
Period
Time
ICS1892
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,
Parameter
© 2000-2001, Integrated Circuit Systems, Inc.
All rights reserved.
t1
141
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
Figure 10-18
Min.
–
–
1000
Typ.
840
shows the timing
February 26, 2001
Max.
1600
1500
Units
ns
ns