Yamaha MCX-1000 Service Manual page 53

IC501 : LAN91C111 (MAIN P.C.B.)
Ethernet
Pin No.
Name
TQFP
29 Interrupt
45 nLocal Device
31 nRead Strobe
32 nWrite Strobe
34 nData Path
Chip Select
9 EEPROM
Clock
10 EEPROM
Select
7 EEPROM
Data Out
8 EEPROM
Data In
3-5 I/O Base
6 Enable
EEPROM
127,128 Crystal 1
Crystal 2
1,33,44, Power
62,77,
98,110,
120
11,16 Analog Power
Buffer
Symbol
Type
INTR0 O24 Interrupt output signal. Used to cause interruption to the host on an
event of a certain status.
Caution: The selection bits which have been determined by the INT
SEL 1-0 bit value in the configuration register are no more required
but retained to keep interchangeability when the FEAST family is
changed.
nLDEV O16 Output signal. This active low output is indicated when AEN is low
and A4-A15 decoding to LAN91C111 is programmed to a higher
byte of the base address register. n LDEV is a linked decode of an
unlatched address and AEN signal.
nRD IS** Input signal. Used in the asynchronous bus interface.
nWR IS** Input signal. Used in the asynchronous bus interface.
nDATACS I with Input signal. When nDATACS is in the low state, the data bus can be
pullup** accessed regardless of selection of AEN, A1, A15 value and bank
selection register. nDATACS provides interface to or from 32 bits of
LAN9C111at one time.
EESK O4 Output signal. Used when 4µ sec clock transfers the data to or from
the serial EEPROM.
EECS O4 Output signal. It is chip select of serial EEPROM, used when forming
and selecting the command of serial EEPROM.
EEDO O4 Output signal. It is linked with D1 input (EEDI) of serial EEPROM.
EEDI I with Input signal. It is linked with DO output (EEDO) of serial EEPROM.
Pulldown**
IOS0- I with Input signal. It is possible to connect the external switch to make a
IOS2 pullup** selection among predefined EEPROM structures.
ENEEP I with Input signal. It enables LAN91C111 to access serial EEPROM (in
pullup** the high or open state). If EEPROM is not connected to LAN91C111,
it must be grounded.
XTAL1 Icik An external 25MHz crystal oscillator must be connected to these
pins. When using the TTL clock, it should be connected to XTAL1
and XTAL2 should remain open.
VDD +3.3V power supply pin.
AVDD +3.3V analog power supply pin.
Function
MCX-1000
53