LXT9763 — Fast Ethernet 10/100 Hex Transceiver with Full MII
Table 51. LED Configuration Register (Address 20, Hex 14) (Continued)
Bit
20.3:2
20.1
Name
Description
Type 1
Default
00 = Stretch LED events to 30 ms.
01 = Stretch LED events to 60 ms.
10 = Stretch LED events to 100 ms.
11 = Reserved.
LEDFREQ
R/W
00
PULSE-
STRETCH
0 = Disable pulse stretching of all LEDs.
1 = Enable pulse stretching of all LEDs.
R/W
R/W
1
0
20.0
Reserved
1. R/W = Read /Write.
2. 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).
3. Combined event LED settings are not affected by Pulse Stretch bit 20.1. These display settings are stretched regardless of
the value of 20.1.
4. 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.
5. Duplex LED maybe active for a brief time after loss of link.
Table 52. Transmit Control Register #1 (Address 28)
Bit
Name
Description
Type2
Default
28.15:4
Reserved
Ignore.
R/W
N/A
00 = Nominal Differential Amp Bandwidth
Bandwidth
Control 1
01 = Slower
10 = Fastest
11 = Faster
28.3:2
28.1:0
R/W
R/W
00
00 = 2.5ns
01 = 3.1ns
10 = 3.7ns
11 = 4.3ns
Risetime
Control
Note 3
1. Transmit Control functions are approximations. They are not guaranteed and not subject to production testing.
2. RO = Read Only.
R/W = Read/Write.
3. The default setting of bits 28.1:0 (Risetime) are determined by pins 91 and 94.
Table 53. Transmit Control Register #2 (Address 30)
Bit
Name
Reserved
Description
Type
Default
30.15:14
R/W
N/A
1 = Increase Driver Amplitude 5% in all modes.
0 = Normal operation.
Increase Driver
Amplitude
30.13
R/W
R/W
0
30.12:0
Reserved
N/A
1. RO = Read Only.
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Datasheet
INTEL [ INTEL ]
