ICS1892 datasheet(138/148 Pages) ICST

138 / 148 page

ICS1892, Rev. D, 2/26/01

February 26, 2001

138

Chapter 10

DC and AC Operating Conditions

ICS1892 Data Sheet

10.5.15

Media Dependent Interface: Input-to-Carrier Assertion/De-Assertion

Table 10-22 lists the significant time periods for the MDI input-to-carrier assertion/de-assertion. The time

periods consist of timings of signals on the following pins: CRS, COL, and TP_RX (that is, the TP_RXP and

TP_RXN pins). Figure 10-15 shows the timing diagram for the time periods.

† The IEEE maximum is 20 bit times.

‡ The IEEE minimum is 13 bit times, and the maximum is 24 bit times.

Figure 10-15.

MDI Input to Carrier Assertion / De-Assertion Timing Diagram

Table 10-22.

MDI Input-to-Carrier Assertion/De-Assertion Timing

Time

Period

Parameter

Conditions

Min.

Typ.

Max.

Units

First Bit of /J/ into TP_RX to CRS

Assert †

–

Bit times

First Bit of /J/ into TP_RX while

Transmitting Data to COL Assert †

Half-Duplex Mode

–

Bit times

First Bit of /T/ into TP_RX to CRS

De-Assert ‡

–

Bit times

First Bit of /T/ Received into TP_RX to

COL De-Assert ‡

Half-Duplex Mode

–

Bit times

First bit

First bit of /T/

TP_RX*

*Shown

unscrambled.

CRS

COL

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