LXT9785 and LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers
214
Datasheet
Document Number: 249241
Revision Number: 007
Revision Date: August 28, 2003
7:4
LED3
Programming
bits
0000 = Display Speed Status
0001 = Display Transmit Status
0010 = Display Receive Status
0011 = Display Collision Status
0100 = Display Link Status
0101 = Display Duplex Status
0110 = Display Isolate Status
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
2
(Stretched)
1101= Display Link and Activity Status combined
2
(Stretched)
1110= Display Duplex and Collision Status combined
4
(Default) (Blink)
1111 = Display Link and RxER Status combined
2
(Blink)
R/W
1110
Reserved for
BGA15
Write as '1001', ignore on Read (BGA15)
3:2
LEDFREQ
00 =Stretch LED events to 30 ms
01 =Stretch LED events to 60 ms
10 =Stretch LED events to 100 ms
11 = Reserved
R/W
00
1
PULSE-
STRETCH
0 = Disable pulse stretching of all LEDs
3
1 = Enable pulse stretching of all LEDs
NOTE:
Receive activity LEDs are initially active based upon
carrier sense.
R/W
1
0
Reserved
Write as 0, ignore on Read
R/W
0
Table 97. Receive Error Count Register (Address 21, Hex 15)
Bit
Name
Description
Type
1
Default
15:0
Receive Error
Count
A 16-bit counter value indicating the number of times a
receive packet with errors occurred. Only one event gets
counted per packet. When maximum count is reached, the
16-bit counter remains full until cleared.
R/
LH
0x0000
1. R = Read Only, LH = Latching High – cleared when read
NOTE:
Intel recommends reading this register once every time link is established to clear the register.
Table 96. LED Configuration Register (Address 20, Hex 14) (Sheet 2 of 2)
Bit
Name
Description
Type
1
Default
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 Error) causes the LED to change state (blink).
3. Combined event LED settings are not affected by Pulse Stretch Register 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.