Panasonic KX-HCM280, Service Manual

Page: 86 / 182

Pin No. Pin Name Description
49 IOS2 Input. External switches can be connected to
these lines to select between predefined
EEPROM configurations. The values of these
pins are readable.
20
nTXLED
Transmit output.
17 NBSELED Board Select LED activated by accesses to I/O
space (nIORD or nIOWR active with AEN low
and valid address decode for ISA). The pulse
is stretched beyond the access duration to
make the LED visible.
19 nRXLED
Receive LED output.
18
nLNKLED Link LED output.
51 ENEEP
Input. This active high input enables the
EEPROM to be read or written by the
LAN91C93. Internally pulled up. Must be
connected to ground if no serial EEPROM is
used.
44 XTAL1
An external parallel resonance 20MHz crystal
should be connected across these pins. If an
external clock source is used, it should be
connected to this pin (XTAL1) and XTAL2
should be left open.
45 XTAL2
An external parallel resonance 20MHz crystal
should be connected across these pins. If an
external clock source is used, it should be
connected to XTAL1 and this pin (XTAL2)
should be left open.
33, 32 RECP/RECN AUI receive differential inputs.
27, 26 TXP
TXN
TXP and TXN are the AUI transmit differential
outputs. They must be externally pulled up
using 150 ohm resistors.
31, 30 COLP
COLN
AIU collision differential inputs. A collision is
indicated by a 10MHz signal at this input pair.
35, 34 TPERXP
TPERXN
10BASE-T receive differential inputs.
25, 23 TPERXP
TPERXN
INTERNAL ENDEC - 10BASE-T transmit
differential outputs.
22, 24 TPERXDP
TPERXDN
10BASE-T delayed transmit differential
outputs. Used in combination with TPETXP
and TPETXN to generate the 10BASE-T
transmit pre-distortion.
39 RBIAS A 22kohm 1% resistor should be connected
between this pin and analog ground.
61, 70, 98, 9, 48,
88, 41
VDD +5.0V power supply pins or 3.3V power supply
pins
86