ICS1893CF datasheet(119/126 Pages) ICST

Teilenummer	ICS1893CF

Bauteilbeschribung	3.3-V 10Base-T/100Base-TX Integrated PHYceive

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Chapter 9 DC and AC Operating Conditions

ICS1893CF, Rev. F, 03/01/07

Mar. 2007

119

ICS1893CF Data Sheet Rev. F - Release

9.5.17 10Base-T: Heartbeat Timing (SQE)

Table 9-24 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 9-18 shows the timing diagram for the time periods.

Note:

1. For more information on 10Base-T SQE operations, see Section 6.5.10, “10Base-T Operation: SQE

Test”.

2. In 10Base-T mode, one bit time = 100 ns.

Figure 9-18. 10Base-T Heartbeat (SQE) Timing Diagram

Table 9-24. 10Base-T Heartbeat (SQE) Timing

Time

Period

Parameter

Conditions

Min.

Typ.

Max.

Units

COL Heartbeat Assertion Delay from

TXEN De-Assertion

10Base-T Half Duplex

–

850

1500

COL Heartbeat Assertion Duration

10Base-T Half Duplex

–

1000

1500

TXEN

TXCLK

COL

ICS1893CF Datenblatt(PDF) 119 Page - Integrated Circuit Systems