LU3X31T-T64 Datasheet, PDF (8/44 Pages) Agere Systems – LU3X31T-T64 Single-Port 3 10/100 Ethernet Transceiver TX

LU3X31T-T64 Single-Port 3 V
10/100 Ethernet Transceiver TX
Preliminary Data Sheet
July 2000
Pin Descriptions (continued)
Table 6. Autonegotiation Configuration (Refer to Table 11.) (continued)
Pin
No.
Pin Name
I/O
Pin Description
43 10HDEN/LEDFD I/O 10 Half-Duplex Enable. The logic level of this pin is detected at powerup or
reset to determine whether 10 Mbits/s half-duplex mode is available. When
autonegotiation is enabled, this input sets the ability register bit in advertise-
ment register 4. When autonegotiation is not enabled, this input will select
the mode of operation. This pin has an internal 40 kΩ pull-up resistor. See
Table 7 for LEDFD description.
Note: Smaller font indicates that the pin has multiple functions.
Table 7. LED and Status Outputs
Pin
No.
Pin Name
I/O
Pin Description
40
LEDRX
I/O Receive LED. This output will drive a 10 mA LED if the LU3X31T-T64 is
receiving data from the UTP cable. This pin has an internal 40 kΩ pull-down
resistor. The LED should be connected as logic 0 configuration as shown in
Figure 5, without the 10 kΩ resistor.
41 LEDTX/ACTLED/ I/O Transmit LED or Activity LED. When bit 7 of register 17h is 0, this output
BPSCR
will drive a 10 mA LED if the LU3X31T-T64 is transmitting data. If the control
bit is set, then the LED will be driven whenever receive or transmit activity is
present. This pin has an internal 40 kΩ pull-down. The LED should be con-
nected as LOGIC 0 configuration in Figure 5 without the 10 kΩ resistor. See
Table 5 for BPSCR description.
44 LNKLED/BPALIGN I/O Link LED. This output will drive a 10 mA LED for as long as a valid link
exists across the cable. Place a 10 kΩ resistor across the LED pins if setting
to nondefault mode, i.e., bypass align mode as shown in Figure 5. See Table
5 for BPALIGN description.
42 LEDCOL/BP4B5B I/O Collision LED. This output will drive a 10 mA LED whenever the LU3X31T-
T64 senses a collision has occurred. Place a 10 kΩ resistor across the LED
pins if setting to nondefault mode, i.e., bypass 4B/5B mode as shown in Fig-
ure 5. See Table 5 for BP4B5B description.
43 LEDFD/10HDEN I/O Full-Duplex Status. This output will drive a 10 mA LED when the LU3X31T-
T64 is in full-duplex mode. Place a 10 kΩ resistor across the LED pins if set-
ting to nondefault mode, i.e., 10HD disable mode as shown in Figure 5. See
Table 6 for 10HDEN description.
17 LEDSP/10FDEN I/O Speed Status. This output will drive a 10 mA LED when the LU3X31T-T64
is in 100 Mbits/s mode. Place a 10 kΩ resistor across the LED pins if setting
to nondefault mode, i.e., 10FD disable mode as shown in Figure 5. See
Table 6 for 10FDEN description.
Note: Smaller font indicates that the pin has multiple functions.
8
Lucent Technologies Inc.