78Q2132 TDK Corp., 78Q2132 Datasheet - Page 9

• Manufacturer Part Number: 78Q2132
• Description: 1/10base-t Homepna/ethernet Transceiver
• Manufacturer: TDK Corp.

LED INDICATORS
The LED pins use standard logic drivers. They output a logic low when the LED is meant to be on and a logic high
when it is meant to be off. The LED should be connected in series with a resistor between the output pin and the
power supply.
OSCILLATOR/CLOCK
NAME
LEDL
LEDTX
LEDRX
LEDCOL
LEDPWR
L E D ! )
LFD_SPD
LED!
NAME
XTLI
XTLO
80-PIN
80-PIN
10
9
53
50
49
48
47
54
55
56
64-PIN
64-PIN
7
8
43
42
41
40
39
44
45
46
TYPE
TYPE
A/I
A
O
O
O
O
O
O
O
O
DESCRIPTION
LED LINK: ON for link up.
LED TRANSMIT: ON when there is a transmission (normally
OFF). This LED works for both 10BASE-T and HomePNA.
LED RECEIVE: ON when there is a reception (normally OFF).
This LED works for both 10BASE-T and HomePNA.
LED COLLISION: In half duplex or HomePNA mode, this is a
collision indicator and turns-ON when a collision occurs. In full
duplex mode, this LED is held OFF.
LED POWER: ON to indicate high power mode when in
HomePNA mode.
LED 10BASE-T: ON for 10BASE-T connection and OFF for
other connections. LED!) is OFF during auto-negotiation.
LED FULL DUPLEX/SPEED: When HPNAEN=0 this turns ON
when in full duplex mode and OFF when in half duplex mode.
When HPNAEN=1 it turns ON to indicate high speed mode.
LED HOMEPNA: ON when HPNAEN=1
DESCRIPTION
CRYSTAL INPUT: Should be connected to a 25 MHz crystal.
Otherwise, it doubles as the clock input pin and connects to a
25 MHz clock source.
CRYSTAL OUTPUT PIN: Should be connected to a 25 MHz
crystal. When the clock comes from an external clock module, it
is not used.
9
HomePNA/Ethernet Transceiver
1/10BASE-TX
78Q2132