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78Q2120C

10/100BASE-TX Transceiver

TDK Corporation 

78Q2120C

10/100BASE-TX Transceiver

MR17: Interrupt Control/Status Register (continued)

Bit

Symbol

Type Default Description

17.3 LP-ACK_INT RC

0 Link Partner Acknowledge Interrupt: This bit is set high by the

auto-negotiation logic when FLP bursts are received with the

acknowledge bit set.

17.2 LS_CHG_INT RC

0 Link Status Change Interrupt: This bit is set when the link

transitions from an OK status to a FAIL status.

17.1 RFAULT_INT RC

0 Remote Fault Interrupt: This bit is set when a remote fault

condition has been indicated by the link partner.

17.0

ANEG-

RC

COMP_INT

0 Auto-Negotiation Complete Interrupt: This bit is set by the auto-

negotiation logic upon successful completion of auto-negotiation.

MR18: Diagnostic Register

Bit

18.15

18.14:13

18.12

Symbol

RSVD

RSVD

ANEGF

18.11

DPLX

Type

R

R/W

RC

R

Default Description

0 Reserved

00h Reserved: Must set to ‘00h’.

0 Auto-Negotiation Fail Indication: This bit is set when auto-

negotiation completes and no common technology was found. It

remains set until read.

0 Duplex Indication: This bit indicates the result of the auto-

negotiation for duplex arbitration as follows:

0 : Half-duplex was the highest common denominator

18.10

RATE

R

1 : Full-duplex was the highest common denominator

0 Rate Indication: This bit indicates the result of the auto-negotiation

for data rate arbitration as follows:

0 : 10Base-T was the highest common denominator

18.9 RX_PASS R

18.8 RX_LOCK R

18.7:0

RSVD

R/W

1 : 100Base-TX was the highest common denominator

0 Receiver Pass Indication: In 10Base-T mode, this bit indicates that

Manchester data has been detected. In 100Base-TX mode, it

indicates that the receive signal activity has been detected (but not

necessarily locked on to).

0 Receive PLL Lock Indication: Indicates that the Receive PLL has

locked onto the receive signal for 100Base-TX operation.

00h Reserved: Must set to ‘00h’.

© 2003 TDK Semiconductor Corporation, Proprietary and Confidential

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Rev_1.1

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