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ICS1893 Datasheet(PDF) 145 Page - Integrated Circuit Systems

Part # ICS1893
Description  3.3-V 10Base-T/100Base-TX Integrated PHYceiver?
PDF  152 Pages
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Manufacturer  ICST [Integrated Circuit Systems]
Direct Link  http://www.icst.com
Logo ICST - Integrated Circuit Systems

ICS1893 Datasheet(HTML) 145 Page - Integrated Circuit Systems

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Chapter 10
DC and AC Operating Conditions
ICS1893 Rev C 6/6/00
June, 2000
145
ICS1893 - Release
Copyright © 2000, Integrated Circuit Systems, Inc.
All rights reserved.
10.5.19
10Base-T: Heartbeat Timing (SQE)
Table 10-26 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
Figure 10-20 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.
Figure 10-20.
10Base-T Heartbeat (SQE) Timing Diagram
Table 10-26.
10Base-T Heartbeat (SQE) Timing
Time
Period
Parameter
Conditions
Min.
Typ.
Max.
Units
t1
COL Heartbeat Assertion Delay from
TXEN De-Assertion
10Base-T Half Duplex
–
850
1500
ns
t2
COL Heartbeat Assertion Duration
10Base-T Half Duplex
–
1000
1500
ns
t2
t1
TXEN
TXCLK
COL



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