Datasheet

78Q2123/78Q2133 Data Sheet DS_21x3_001
3.15 MR23:LEDConfigurationRegister
Bit Symbol Type Default Description
23.15:8 Reserved NA <0000> Must set to zero on each write to MR23
23.7:4 LED1[3:0] R/W <1h> 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
23.3:0 LED0[3:0] R/W <0h>
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
3.16 MR24: MDI/MDIX Control Register
Bit Symbol Type Default Description
24.15:8 Reserved R 0 Reserved
24.7 PD_MODE R/W 1
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.
24.6 AUTO_SW R/W 1 Write a ‘1’ to this bit to enable auto switching.
24.5 MDIX R/W 0 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.
24.4 MDIX_CM R 0 Indicates completion of auto-switch sequence.
1 = Sequence completed.
0 = Sequence in progress or auto-switch is disabled.
24.3:0 MDIX_SD R/W <0000> 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].
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