Yamaha MCX 1000 - MusicCAST - Digital Audio Server, Руководство по обслуживанию, Страница: 53 / 111

MCX-1000
53
MCX-1000
IC501 : LAN91C111 (MAIN P.C.B.)
Ethernet
Pin No.
Name Symbol
Buffer
Function
TQFP Type
29 Interrupt INTR0 O24
45 nLocal Device nLDEV O16
31 nRead Strobe nRD IS**
32 nWrite Strobe nWR IS**
34 nData Path nDATACS I with
Chip Select pullup**
9 EEPROM EESK O4
Clock
10 EEPROM EECS O4
Select
7 EEPROM EEDO O4
Data Out
8 EEPROM EEDI I with
Data In Pulldown**
3-5 I/O Base IOS0- I with
IOS2 pullup**
6 Enable ENEEP I with
EEPROM pullup**
127,128 Crystal 1 XTAL1 Icik
Crystal 2
1,33,44, Power VDD
62,77,
98,110,
120
11,16 Analog Power AVDD
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.
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.
Input signal. Used in the asynchronous bus interface.
Input signal. Used in the asynchronous bus interface.
Input signal. When nDATACS is in the low state, the data bus can be
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.
Output signal. Used when 4
µ
sec clock transfers the data to or from
the serial EEPROM.
Output signal. It is chip select of serial EEPROM, used when forming
and selecting the command of serial EEPROM.
Output signal. It is linked with D1 input (EEDI) of serial EEPROM.
Input signal. It is linked with DO output (EEDO) of serial EEPROM.
Input signal. It is possible to connect the external switch to make a
selection among predefined EEPROM structures.
Input signal. It enables LAN91C111 to access serial EEPROM (in
the high or open state). If EEPROM is not connected to LAN91C111,
it must be grounded.
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.
+3.3V power supply pin.
+3.3V analog power supply pin.