82551QM Datasheet, PDF (19/120 Pages) Intel Corporation – Fast Ethernet Multifunction PCI/CardBus Controller

Networking Silicon — 82551QM
4.5
Test Port Signals
Table 8. Test Port Signals
Symbol
Type
Name and Function
TEST
TCK
TI
TEXEC
TO
IN
IN
IN
IN
OUT
Test Port. If this input pin is high, the 82551QM enables the test port.
During nominal operation this pin should be connected to a pull-down
resistor.
Test Port Clock. This pin is used for the Test Port Clock signal.
Test Port Data Input. This pin is used for the Test Port Data Input
signal.
Test Port Execute Enable. This pin is used for the Test Port Execute
Enable signal.
Test Port Data Output. This pin is used for the Test Port Data Output
signal.
Note: These test port signals are not JTAG compatible. As a result, a BSDL file is not required.
4.6
PHY Signals
Table 9. PHY Signals
Symbol
Type
Name and Function
X1
X2
TDP
TDN
RDP
RDN
ACTLED#
LILED#
SPDLED#
AI
AO
AO
AI
OUT
OUT
OUT
Crystal Input One. X1 and X2 can be driven by an external 25 MHz
crystal. Otherwise, X1 may be driven by an external 3.3 V metal-oxide
semiconductor (MOS) level 25 MHz oscillator when X2 is left floating.
Crystal Input Two. X1 and X2 can be driven by an external 25 MHz
crystal. Otherwise, X1 may be driven by an external 3.3 V MOS level
25 MHz oscillator when X2 is left floating.
Analog Twisted Pair Ethernet Transmit Differential Pair. These
pins transmit the serial bit stream for transmission on the Unshielded
Twisted Pair (UTP) cable. The current-driven differential driver can be
two-level (10BASE-T) or three-level (100BASE-TX) signals depending
on the mode of operation. These signals interface directly with an
isolation transformer.
Analog Twisted Pair Ethernet Receive Differential Pair. These pins
receive the serial bit stream from the isolation transformer. The bit
stream can be two-level (10BASE-T) or three-level (100BASE-TX)
signals depending on the mode of operation.
Activity LED. The Activity LED pin indicates either transmit or receive
activity. When activity is present, the activity LED is on (ACTLED#
active low); when no activity is present, the activity LED is off.
In Wake on LAN mode, the ACTLED# signal is used to indicate that
the received frame passed MAC address filtering.
Link Integrity LED. The Link Integrity LED pin indicates link integrity.
If the link is valid in either 10 or 100 Mbps, the LED is on (LILED#
active low); if link is invalid, the LED is off.
Speed LED. The Speed LED pin indicates the speed. The speed LED
will be on at 100 Mbps (SPDLED# active low) and off at 10 Mbps.
Datasheet
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