3X38FTR Datasheet, PDF (19/64 Pages) Agere Systems – OCTAL-FET (Fast Ethernet Transceiver) for 10Base-T/100Base-TX/FX

Preliminary Data Sheet
September 2000
3X38FTR 208-Pin SQFP
OCTAL-FET for 10Base-T/100Base-TX/FX
Pin Descriptions (continued)
Table 6. LED and Configuration Pins (continued)
Pin
Signal
Type
Description
3
ACTLED_4/
O Activity LED[4]. This pin indicates transmit or receive activity on port 4.
BIACTLED_4/
10 mA active-high output.
AUTO_EN
O Bicolor Activity LED[4]. When the 3X38 is placed in the bicolor LED
mode by pulling both of the LED_MODE[1:0] pins high at powerup or
reset, this output will go high whenever there is either transmit or
receive activity. This output works in conjunction with the link LED out-
puts to drive a single bicolor LED package, when in bicolor LED mode.
10 mA active-high output.
I Autonegotiation Enable. At powerup or reset, when this pin is high
through a 10 kΩ resistor, autonegotiation is enabled. Pulsing this pin will
cause autonegotiation to restart. This input has the same function as
register 0, bit 12. This input and the register bit are ANDed together.
This pin has an internal 50 kΩ pull-down resistor; default is autonegotia-
tion off.
4
ACTLED_3/
O Activity LED[3]. This pin indicates transmit or receive activity on port 3.
BIACTLED_3/
10 mA active-high output.
SCRAM_DESC_BYP _{O Bicolor Activity LED[3]. When the 3X38 is placed in the bicolor LED}
ASS
mode by pulling both of the LED_MODE[1:0] pins high at powerup or
reset, this output will go high whenever there is either transmit or
receive activity. This output works in conjunction with the link LED out-
puts to drive a single bicolor LED package, when in bicolor LED mode.
10 mA active-high output.
I Scrambler/Descrambler Bypass. At powerup or reset, this pin may be
used to enable the SCRAM_DESC_BYPASS function by pulling this pin
high through a 10 kΩ resistor, if station management is unavailable.
This is the same function as register 29, bit 4.
This pin has an internal 50 kΩ pull-down resistor for normal operation
(scrambler/descrambler ON). This input and the register bit [29.4] are
ORed together during powerup and reset.
5
ACTLED_2/
O Activity LED[2]. This pin indicates transmit or receive activity on port 2.
BIACTLED_2/
10 mA active-high output.
LITF_EN
O Bicolor Activity LED[2]. When the 3X38 is placed in the bicolor LED
mode by pulling both of the LED_MODE[1:0] pins high at powerup or
reset, this output will go high whenever there is either transmit or
receive activity. This output works in conjunction with the link LED out-
puts to drive a single bicolor LED package, when in bicolor LED mode.
10 mA active-high output.
I Enhanced Link Integrity Test Function. When this input is pulled high
at powerup or reset through a 10 kΩ resistor, the 3X38 will detect and
change speed from 10 Mbits/s to 100 Mbits/s, when an instantaneous
speed change occurs. This pin is ORed with register 30, bit 6. This pin
has an internal 50 kΩ pull-up resistor; default is LITF_EN enabled.
Lucent Technologies Inc.
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