RTL8208B-LF/RTL8208BF-LF
Datasheet
Table 31. Serial LED Status
Description
Collision/Full duplex Indicator.
LED Status
Col/Fulldup
Blinks every 43ms when collisions are occurring. Low for full
duplex, and high for half duplex mode.
Link/Act
Link/Activity Indicator.
In 3-bit serial stream mode, low for link established. In 3-bit
Bi-color LED mode, Link/Act is high for link established
when speed is low (100Mbps); Link/Act is low for link
established when speed is high (10Mbps). Link/Act Blinks
every 43ms when the corresponding port is transmitting or
receiving.
Spd
Speed Indicator.
Low for 100Mbps, high for 10Mbps.
Link/Act/Spd
Link/Activity/Speed Indicator. Low for link established.
Blinking every 43ms for 100Mbps activity. Blinking every
120ms for 10Mbps activity.
LED Blinking Time
LED blinking time can be set to 120ms by setting LED_BLNK_TIME=0. The LED statuses supporting
43/120ms blink times are Col/Fulldup, Link/Act. For status Link/Act/Spd, LED blinking time is not
affected by LED_BLNK_TIME.
Serial Stream Order
Every bit stream is output port by port, from port0 to port7 with Col/Fulldup as the first bit in a port
stream. In 2-bit serial stream mode, the sequence is Spd, then Link/Act. The following diagrams illustrate
the sequences in 3-bit and 2-bit serial stream mode.
640 ns
640 ns
640 ns
640 ns
640 ns
640 ns
640 ns
640 ns
640 ns
LEDCLK
LEDDTA
21
24
1
2
3
20
22
23
19
Col/Dup Link/Act
Spd
Col/Dup Link/Act
Spd
Col/Dup Link/Act
Spd
Port 0 3-bit Serial Stream
Port 6 3-bit Serial Stream
Port 7 3-bit Serial Stream
Figure 10. 3-Bit Serial Stream Mode
640 ns
640 ns
640 ns
640 ns
640 ns
640 ns
640 ns
LEDCLK
LEDDTA
13
14
15
16
1
2
Spd
Link/Act
Spd
Link/Act
Spd
Link/Act
Port 6 2-bit
Serial Stream
Port 7 2-bit
Serial Stream
Port 0 2-bit
Serial Stream
Figure 11. 2-Bit Serial Stream Mode
Single-Chip Octal 10/100-TX/FX PHY Transceiver
39
Track ID: JATR-1076-21 Rev. 1.3
REALTEK [ Realtek Semiconductor Corp. ]
