lxt9781 Intel Corporation, lxt9781 Datasheet - Page 74

• Manufacturer Part Number: lxt9781
• Description: Fast Ethernet 10/100 Multi-port Transceiver With Rmii
• Manufacturer: Intel Corporation

LXT9761/9781 — Fast Ethernet 10/100 Multi-Port Transceiver with RMII
74
20.15:12
20.11:8
20.7:4
1. R/W = Read /Write
2. Link status is the primary LED driver. The LED is asserted (solid ON) when the link is up.
3. Combined event LED settings are not affected by Pulse Stretch bit 20.1. These display settings are stretched regardless of
4. Duplex status is the primary LED driver. The LED is asserted (solid ON) when the link is full duplex.
5. Duplex LED maybe active for a brief time after loss of link.
Bit
RO = Read Only
LH = Latching High
The secondary LED driver (Receive or Activity) causes the LED to change state (blink).
the value of 20.1.
Collision status is the secondary LED driver. The LED changes state (blinks) when a collision occurs.
Table 48. LED Configuration Register (Address 20, Hex 14)
LED1
Programming
bits
LED2
Programming
bits
LED3
Programming
bits
Name
0000 = Display Speed Status (Continuous, Default).
0001 = Display Transmit Status (Stretched).
0010 = Display Receive Status (Stretched).
0011 = Display Collision Status (Stretched).
0100 = Display Link Status (Continuous).
0101 = Display Duplex Status (Continuous)
0110 =Reserved.
0111 = Display Receive or Transmit Activity (Stretched).
1000 = Test mode- turn LED on (Continuous).
1001 = Test mode- turn LED off (Continuous).
1010 = Test mode- blink LED fast (Continuous).
1011 = Test mode- blink LED slow (Continuous).
1100 = Display Link and Receive Status combined
1101 = Display Link and Activity Status combined
1110 = Display Duplex & Collision Status combined
1111 = Reserved.
0000 = Display Speed Status.
0001 = Display Transmit Status.
0010 = Display Receive Status.
0011 = Display Collision Status.
0100 = Display Link Status (Default).
0101 = Display Duplex Status
0110 = Reserved.
0111 = Display Receive or Transmit Activity.
1000 = Test mode- turn LED on.
1001 = Test mode- turn LED off.
1010 = Test mode- blink LED fast.
1011 = Test mode- blink LED slow.
1100 = Display Link and Receive Status combined
1101 = Display Link and Activity Status combined
1110 = Display Duplex & Collision Status combined
1111 = Reserved.
0000 = Display Speed Status.
0001 = Display Transmit Status.
0010 = Display Receive Status (Default).
0011 = Display Collision Status.
0100 = Display Link Status.
0101 = Display Duplex Status
0110 = Reserved.
0111 = Display Receive or Transmit Activity.
1000 = Test mode- turn LED on.
1001 = Test mode- turn LED off.
1010 = Test mode- blink LED fast.
1011 = Test mode- blink LED slow.
1100 = Display Link and Receive Status combined
1101 = Display Link and Activity Status combined
1110 = Display Duplex & Collision Status combined
1111 = Reserved.
5
5
.
.
Description
5
.
2
2
2
2
2
2
(Stretched)
(Stretched)
(Stretched)
4
4
4
(Stretched)
(Stretched)
(Stretched)
(Stretched)
(Stretched)
(Stretched)
3
3
3
.
.
.
3
3
3
3,5
3,5
3,5
.
.
.
.
.
.
Type
R/W
R/W
R/W
Datasheet
1
Default
0000
0100
0010