78Q2123R/F1 Maxim Integrated, 78Q2123R/F1 Datasheet - Page 21

• Manufacturer Part Number: 78Q2123R/F1
• Description: Ethernet ICs
• Manufacturer: Maxim Integrated

Specifications of 78Q2123R/F1

• Rohs: yes

DS_21x3_001
3.10 MR18: Diagnostic Register
3.11 MR19: Transceiver Control
3.12 MR20: Reserved
3.13 MR21: Reserved
3.14 MR22: Reserved
Rev. 1.6
18.15:13
19.15:14
19.13:0
20.15:0
21.15:0
22.15:0
18.7:0
18.12
18.11
18.10
18.9
18.8
Bit
Bit
Bit
Bit
Bit
RX_LOCK
Reserved
Reserved
Reserved
Symbol
TXO[1:0]
ANEGF
Symbol
Symbol
Symbol
Symbol
RSVD
RXSD
RSVD
DPLX
RATE
RSVD
Type
Type
Type
Type
Type
R/W
RC
NA
NA
NA
R
R
R
R
R
R
R
Default
Default
Default
Default
Default
XXXXh
XXXXh
XXXXh
XXXh
00h
01
0
0
0
0
0
0
Description
Reserved
Duplex Indication: This bit indicates the result of the
auto-negotiation for duplex arbitration as follows:
Rate Indication: This bit indicates the result of the auto-
negotiation for data rate arbitration as follows:
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).
Reserved: Must set to ‘00h’.
Description
Reserved
Description
Description
Description
Auto-Negotiation Fail Indication: This bit is set when
auto-negotiation completes and no common technology was
found. It remains set until read.
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).
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.
Reserved: must be 0000h.
Reserved: must be 0000h.
Reserved: must be 0000h.
0 = Half-duplex was the highest common denominator
1 = Full-duplex was the highest common denominator
0 = 10Base-T was the highest common denominator
1 = 100Base-TX was the highest common denominator
78Q2123/78Q2133 Data Sheet
21