DP83256 datasheet(82/144 Pages) NSC

82 / 144 page

50 Registers (Continued)

538 TRIGGER DEFINITION REGISTER (TDR)

This register determines which events cause a trigger transition and which transmit mode is entered when a trigger transition is

detected The trigger transmit modes are the same as those found in the Current Transmit State Register (CTSR) and are

loaded from the TDR into the CTSR when any of the selected trigger conditions occur When a trigger condition occurs

CMTCRTCO is set

The Trigger Definition Register is useful to implement the strict PC

React time requirement

ACCESS RULES

ADDRESS

READ

WRITE

26h

Always

TONT

TOQLS

TOHLS

TOMLS

TOSILS

TTM2

TTM1

TTM0

Bit

Symbol

Description

TTM0

TRIGGER TRANSMIT MODE k0 1 2l

These bits select one of 6 transmission modes to be loaded into the

Current Transmit State Register (CTSR) when a trigger condition is detected The trigger condition is selected by

TTM1

the upper 5 bits of this register

TTM2

TTM1

TTM0

000

Active Transmit Mode (ATM)

Normal transmission of incoming PHY Request data

001

Idle Transmit Mode (ITM)

Transmission of Idle symbol pairs (11111 11111)

010

Off Transmit Mode (OTM)

Transmission of Quiet symbol pairs (00000 00000) and

deassertion of the PMD transmitter Enable pin (TXE)

011

Reserved

Reserved for future use Users are discouraged from using this transmit

mode If selected however the transmitter will generate Quiet symbol pairs

(00000 00000)

100

Master Transmit Mode (MTM)

Transmission of Halt and Quiet symbol pairs

(00100 00000)

101

Halt Transmit Mode (HTM)

Transmission of Halt symbol pairs (00100 00100)

110

Quiet Transmit Mode (QTM)

Transmission of Quiet symbol pairs (00000 00000)

111

Reserved

Reserved for future use Users are discouraged from using this transmit

mode If selected however the transmitter will generate Quiet symbol pairs

(00000 00000)

TOSILS

TRIGGER ON SILS

Trigger when SILS is received

TOMLS

TRIGGER ON MLS

Trigger when MLS is received

TOHLS

TRIGGER ON HLS

Trigger when HLS is received

TOQLS

TRIGGER ON QLS (or NSD)

Trigger when QLS is received

TONT

TRIGGER ON Noise Threshold

Trigger when Noise Threshold is reached (Current Noise Registere0)

DP83256 Datasheet(PDF) 82 Page - National Semiconductor (TI)

DP83256 Datasheet(HTML) 82 Page - National Semiconductor (TI)

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