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Table 14. Direct Drive LED Configuration Settings (Register 20)
LED Bits
LED1
LED2
LED3
15:12
11:8
7:4
1. Link status is the primary LED driver. The LED is asserted (solid ON) when the link is up. The secondary LED driver (receive,
activity, or isolate) causes the LED to change state (blink).
2. Combined event LED settings are not affected by bit 20.1 (Pulse Stretch). These settings are stretched regardless of the
value of 20.1.
3. Duplex status is the primary LED driver. The LED is asserted (solid ON) when the link is full-duplex. Collision status is the
secondary LED driver. The LED changes state (blinks) when a collision occurs.
Table 15. LED Pulse Stretch Settings (Register 20)
Bit
Name
00 = Stretch LED events to 30 ms.
01 = Stretch LED events to 60 ms.
20.3:2
LEDFREQ
10 = Stretch LED events to 100 ms.
11 = Reserved
PULSE-
0 = Disable pulse stretching of all LEDs.
20.1
STRETCH
1 = Enable pulse stretching of all LEDs.
Developer Manual
Program Bits
0000
Indicates 100 Mbps operation. (Default for LED1)
0001
Indicates transmit (stretched).
0010
Indicates receive (stretched). (Default for LED3)
0011
Indicates collision. (stretched)
0100
Indicates active link (continuous). (Default for LED2)
0101
Indicates full-duplex.
0110
Reserved.
0111
Indicates receive or transmit activity.
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
Indicates link and receive status combined.
1101
Indicates link and activity status combined.
1110
Indicates duplex and collision status combined.
1111
Reserved.
Description
LXD9781 PQFP Demo Board
Description
1
2
(Stretched)
1
2
(Stretched)
3
2
(Stretched)
Type
Default
R/W
R/W
00
1
17
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