3X38FTR Datasheet, PDF (23/64 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
195
FDUPLED_2/
SERSTROBE/
ISOLATE
O Full-Duplex LED[2]. This LED output can operate as the full-duplex
LED indicator, or as a collision LED indicator, or as a serial LED output.
This output is only valid when the link is up. When the link is operating in
full-duplex mode, this LED output is the full-duplex LED (logic high out-
put). When the link is operating in half-duplex mode, this LED output
becomes the collision LED output (logic high output). 10 mA active-high
output.
O Serial LED Strobe. This is a synchronizing strobe for the serial LED
data output stream that goes high at the start of each serial stream,
once every 32 clocks when in serial LED mode.
I Isolate Mode. As an input, this pin can be used at powerup or reset to
select the isolate operation mode. If this pin is pulled high through a
10 kΩ resistor, the 3X38 will powerup or reset to the isolate mode. (RMII
and SMII outputs to high-impedance state.)
173
FDUPLED_5/
SPEED
This pin is internally pulled through a 50 kΩ resistor. The default state is
for the 3X38 to powerup or reset in a nonisolate mode. This pin and reg-
ister bit [0.10] are ORed together during powerup and reset.
O Full-Duplex LED[5]. This LED output can operate as the full-duplex
LED indicator, or as a collision LED indicator, or as a serial LED output.
This output is only valid when the link is up. When the link is operating in
full-duplex mode, this LED output is the full-duplex LED (logic high out-
put). When the link is operating in half-duplex mode, this LED output
becomes the collision LED output (logic high output). 10 mA active-high
output.
I Speed. At powerup or reset, this signal can be used to select the oper-
ating speed and is the same function as register 0, bit 13. If this signal is
pulled high with a 10 kΩ, it will enable 100 Mbits/s operation. If this sig-
nal is pulled low with a 10 kΩ, it will enable 10 Mbits/s operation.
171,
FDUPLED[7:6]
172
176
FDUPLED_3/
RESERVED
This signal is ignored when autonegotiation is enabled. This signal and
the register bit are ANDed. This pin has an internal 50 kΩ pull-up, to
default to 100TX mode, when autonegoatiation is not enabled.
O Full-Duplex LED[7:6]. This LED output can operate as the full-duplex
LED indicator, or as a collision LED indicator, or as a serial LED output.
This output is only valid when the link is up. When the link is operating in
full-duplex mode, this LED output is the full-duplex LED (logic high out-
put). When the link is operating in half-duplex mode, this LED output
becomes the collision LED output (logic high output). 10 mA active-high
output.
O Full-Duplex LED[3]. This LED output can operate as the full-duplex
LED indicator, or as a collision LED indicator, or as a serial LED output.
This output is only valid when the link is up. When the link is operating in
full-duplex mode, this LED output is the full-duplex LED (logic high out-
put). When the link is operating in half-duplex mode, this LED output
becomes the collision LED output (logic high output). 10 mA active-high
output.
I Reserved. Do not pull this pin high at powerup or reset.
Lucent Technologies Inc.
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