Datasheet

DS_21x3_001 78Q2123/78Q2133 Data Sheet
3.10 MR18: DiagnosticRegister
Bit Symbol Type Default Description
18.15:13 RSVD R 0 Reserved
18.12 ANEGF RC 0 Auto-Negotiation Fail Indication: This bit is set when
auto-negotiation completes and no common technology was
found. It remains set until read.
18.11 DPLX R 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
1 = Full-duplex was the highest common denominator
18.10 RATE R 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
1 = 100Base-TX was the highest common denominator
18.9 RXSD R 0 Receiver Signal Detect 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).
18.8 RX_LOCK R 0
Receive PLL Lock Indication: Indicates that the Receive
PLL has locked onto the receive signal for the selected
speed of operation (10Base-T or 100Base-TX).
18.7:0 RSVD R 00h Reserved: Must set to ‘00h’.
3.11 MR19: Transceiver Control
Bit Symbol Type Default Description
19.15:14 TXO[1:0] R/W 01 Transmit Amplitude Selection: Sets the transmit output
amplitude to account for transmit transformer insertion loss.
00 = Gain set for 0.0dB of insertion loss.
01 = Gain set for 0.4dB of insertion loss.
10 = Gain set for 0.8dB of insertion loss.
11 = Gain set for 1.2dB of insertion loss.
19.13:0 RSVD R XXXh Reserved
3.12 MR20:Reserved
Bit Symbol Type Default Description
20.15:0 Reserved NA XXXXh Reserved: must be 0000h.
3.13 MR21:Reserved
Bit Symbol Type Default Description
21.15:0 Reserved NA XXXXh Reserved: must be 0000h.
3.14 MR22:Reserved
Bit Symbol Type Default Description
22.15:0 Reserved NA XXXXh Reserved: must be 0000h.
21