3X38FTR Datasheet, PDF (21/64 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
205
SPEEDLED_1/
PHY_ADD[1]
O Speed LED[1]. This pin indicates the operating speed of port 1 on the
3X38. A high on this pin indicates 100 Mbits/s operation. A low indicates
10 Mbits/s operation. 10 mA active-high output.
I PHY Address 1. At powerup or reset, this pin may be used to set the
PHY address bit 1.
204
SPEEDLED_2/
PHY_ADD[2]
If this pin is pulled high through a 10 kΩ resistor, it will set PHYADD[0] to
a 1. If this pin is pulled low through a 10 kΩ resistor, it will set PHY-
ADD[1] to a 0. This pin has an internal 50 kΩ pull-down resistor.
O Speed LED[2]. This pin indicates the operating speed of port 2 on the
3X38. A high on this pin indicates 100 Mbits/s operation. A low indicates
10 Mbits/s operation. 10 mA active-high output.
I PHY Address 2. At powerup or reset, this pin may be used to set the
PHY address bit 2.
203
SPEEDLED_3/
NO_LP
200, SPEEDLED_[5:4]/
201 LED_MODE[1:0]
If this pin is pulled high through a 10 kΩ resistor, it will set PHYADD[0] to
a 1. If this pin is pulled low through a 10 kΩ resistor, it will set PHY-
ADD[2] to a 0. This pin has an internal 50 kΩ pull-down resistor.
O Speed LED[3]. This pin indicates the operating speed of port 3 on the
3X38. A high on this pin indicates 100 Mbits/s operation. A low indicates
10 Mbits/s operation. 10 mA active-high output.
I No Link Pulse Mode. At powerup or rest, pulling this signal high
through a 10 kΩ resistor, will allow 10 Mbits/s operation with link pulses
disabled. If the 3X38 is configured for 100 Mbits/s operation, this signal
is ignored. This is the same function as register 30, bit 0. The input and
the register bit are ORed together. This pin has an internal 50 kΩ pull-
down resistor, default is normal link pulse mode.
O Speed LED[5:4]. These pins indicate the operating speed of ports [5:4]
on the 3X38. A high on this pin indicates 100 Mbits/s operation. A low
indicates 10 Mbits/s operation. 10 mA active-high output.
I LED Mode [1:0]. At powerup or reset, the LED mode configuration
pins[1:0] are used to select the LED mode of operation by pulling them
high or low through a 10 kΩ resistor as shown below.
LED Modes
Pin 1 Pin 0
0
0
0
1
1
0
1
1
Mode
Parallel
Reserved
Serial
Bicolor
Outputs
SPEEDLED_[7:0], FDUPLED[7:0],
LINKLED[7:0], ACTLED[7:0]
Reserved
SERCLK, SERDATA, SERSTROBE
ACTLED[7:0], LINKLED[7:0]
198, SPEEDLED_[7:6]
199
When in serial LED mode, all eight channels’ LED functions will be mul-
tiplexed onto one serial LED output stream.
When in bicolor LED mode, each of the eight channels will have two
LED outputs each, to drive a bicolor LED. These pins have internal
50 kΩ pull-down resistors.
O Speed LED[7:6]. These pins indicate the operating speed of ports [7:6]
on the 3X38. A high on this pin indicates 100 Mbits/s operation. A low
indicates 10 Mbits/s operation. 10 mA active-high output.
Lucent Technologies Inc.
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