lxt971a Intel Corporation, lxt971a Datasheet - Page 86

• Manufacturer Part Number: lxt971a
• Description: 3.3v Dual-speed Fast Ethernet Phy Transceiver
• Manufacturer: Intel Corporation

LXT971A 3.3V Dual-Speed Fast Ethernet Transceiver
86
Table 56. LED Configuration Register (Address 20, Hex 14) (Continued)
Table 57. Digital Config Register (Address 26)
20.7:4
20.3:2
20.1
20.0
26.15:12
26.11
26.10
26.9
26.8:0
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 Register bit 20.1. These display settings
4. Duplex status is the primary LED driver. The LED is asserted (solid ON) when the link is full-duplex.
5. Values are relative approximations. Not guaranteed or production tested.
1. R/W = Read /Write, RO = Read Only, LH = Latching High
Bit
RO = Read Only
LH = Latching High
The secondary LED driver (Receive or Activity) causes the LED to change state (blink).
are stretched regardless of the value of 20.1.
Collision status is the secondary LED driver. The LED changes state (blinks) when a collision occurs.
Bit
LED3
Programming
bits
LEDFREQ
PULSE-
STRETCH
Reserved
Name
Reserved
MII Drive Strength
Reserved
Show Symbol Error
Reserved
5
Name
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 = Unused
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
(Stretched)
1101 = Display Link and Activity Status combined
(Stretched)
1110 = Display Duplex and Collision Status combined
(Stretched)
1111 = Unused
00 = Stretch LED events to 30 ms.
01 = Stretch LED events to 60 ms.
10 = Stretch LED events to 100 ms.
11 = Reserved.
0 = Disable pulse stretching of all LEDs.
1 = Enable pulse stretching of all LEDs.
Ignore.
3
3
3
Reserved
1 = Increased MII drive strength
0 = Normal MII drive strength
Reserved
1 = Map Symbol Error Signal To RXER
0 = Normal RXER
Reserved
Description
Description
2
2
4
Rev. Date: August 7, 2002
RO
R/W
RO
R/W
RO
Type
Type
R/W
R/W
R/W
R/W
Document #: 249414
1
1
Revision #: 002
Datasheet
0
0
0
0
0
Default
Default
0010
N/A
00
1