ICS1892
TSD
Chapter 10 DC and AC Operating Conditions
10Base-T/100BIaCseS-TX1I8nt9eg2rated PHYceiver™
10.5.18 10Base-T: Heartbeat Timing (SQE)
Table 10-25 lists the significant time periods for the 10Base-T heartbeat (that is, the Signal Quality Error,
which consists of timings of signals on the TXEN, TXCLK, and COL pins). Figure 10-18 shows the timing
diagram for the time periods.
Note:
1. For more information on 10Base-T SQE operations, see Section 7.5.10, “10Base-T Operation: SQE
Test”.
2. In 10Base-T mode, one bit time = 100 ns.
Table 10-25. 10Base-T Heartbeat (SQE) Timing
Time
Parameter
Conditions
Min.
Typ. Max. Units
Period
t1
t2
COL Heartbeat Assertion Delay from 10Base-T Half Duplex
TXEN De-Assertion
–
–
840
1600
ns
ns
COL Heartbeat Assertion Duration
10Base-T Half Duplex
1000 1500
Figure 10-18. 10Base-T Heartbeat (SQE) Timing Diagram
TXEN
TXCLK
COL
t1
t2
ICS1892, Rev. D, 2/26/01
February 26, 2001
© 2000-2001, Integrated Circuit Systems, Inc.
All rights reserved.
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IDT™ / ICS™ 10Base-T/100Base-TX Integrated PHYceiver™
ICS1892
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IDT [ INTEGRATED DEVICE TECHNOLOGY ]
