78Q2123/F1 Maxim Integrated, 78Q2123/F1 Datasheet - Page 22

• Manufacturer Part Number: 78Q2123/F1
• Description: Ethernet ICs
• Manufacturer: Maxim Integrated

Specifications of 78Q2123/F1

• Rohs: yes

78Q2123/78Q2133 Data Sheet
3.15 MR23: LED Configuration Register
3.16 MR24: MDI/MDIX Control Register
22
23.15:8
24.15:8
23.7:4
23.3:0
24.3:0
24.7
24.6
24.5
24.4
Bit
Bit
LED1[3:0]
LED0[3:0]
Reserved
PD_MODE
AUTO_SW
MDIX_CM
Symbol
MDIX_SD
Reserved
Symbol
MDIX
Type
R/W
R/W
NA
Type
R/W
R/W
R/W
R/W
R
R
Default
<0000>
<1h>
<0h>
Default
<0000>
0
1
1
0
0
Description
Must set to zero on each write to MR23
0000 = Link OK
0001 = RX or TX Activity (Default LED1)
0010 = TX Activity
0011 = RX Activity
0100 = Collision
0101 = 100 BASE-TX mode
0110 = 10 BASE-T mode
0111 = Full Duplex
1000 = Link OK/Blink=RX or TX Activity
0000 = Link OK (Default LED0)
0001 = RX or TX Activity
0010 = TX Activity
0011 = RX Activity
0100 = Collision
0101 = 100 BASE-TX mode
0110 = 10 BASE-T mode
0111 = Full Duplex
1000 = Link OK/Blink=RX or TX Activity
Description
Reserved
Write a ‘1’ to this bit to add Parallel Detect mode. This
will allow auto-switching to work when auto-negotiation is
off while the other device has it on.
Write a ‘1’ to this bit to enable auto switching.
Indicates state of the MDI pair or force configuration:
1 = MDIX (cross over)
0 = MDI
When auto_sw is a ‘1’, this bit will only be readable.
When auto_sw is a ‘0’ this bit can be written to set the
configuration.
Indicates completion of auto-switch sequence.
1 = Sequence completed.
0 = Sequence in progress or auto-switch is disabled.
Write initial pattern seed for switching algorithm. The
initial seed directly affects attempts [5,4] respectively to
write bits [3:0]. Setting to [0000] will result in device
using its own seed of [0101].
DS_21x3_001
Rev. 1.6