Yamaha MCX-1000 Service Manual page 55

IC501 : LAN91C111 (MAIN P.C.B.)
Ethernet
Pin No. Buffer
Name Symbol
TQFP Type
2 nChip Select nCSOUT O4 For the output signal. Chip select is provided for mapping to the
Output space of LAN91C111 with PHY function. It enables accessing the 8-
bit lower address of LAN91C111 when BANK SELECTED is "7".
12 External RBIAS NA For setting the transmission current. The output current for TP
Register transmission output is set by the external resistor connected
between this pin and GND.
14 TPO+ O/I For output signal to transmit positive twist pair.
15 TPO- O/I For output signal to transmit negative twist pair.
17 TPI+ I/O For output signal to receive positive twist pair.
18 TPI- I/O For input signal to receive negative twist pair.
22 nLEDA OD16 For PHY LED output.
23 nLEDB OD16 For PHY LED output.
Caution (1) When EEPROM is enabled.
This section describes each SM SC LAN91C111 signal in the detail. The signals are classified into function groups based on their related
functions.
When the signal name starts with "n", it indicates that the signal is in the active low state and when no "n" there, it indicates the active high
state of the signal.
"assert" or "assertion" indicates that the signal is effective regardless of whether the voltage level is high or low. "negata" or "negation"
indicates that the signal is ineffective.
Also, "high-Z" indicates that the signal is in the tri-state.
"Undefined" means that the signal can be high, low, tri-state or intermediate level.
Buffer Types
O4 Output buffer with 2mA transmission side and 4mA reception side
O12 Output buffer with 6mA transmission side and 12mA reception side
O16 Output buffer with 8mA transmission side and 16mA reception side
O24 Output buffer with 12mA reception side and 24mA reception side
OD16 Open drain buffer with 16mA reception side
I/O4 Bidirectional buffer with 2mA transmission side and 4mA reception side
I/O24 Bidirectional buffer with 12mA transmission side and 24mA reception side
I/OD Bidirectional open drain buffer with 4mA reception side
I Input buffer
IS Input buffer with Schmidt trigger hysteresis
Iclk Clock input buffer
I/O Difference input
O/I Difference output
** 5V tolerant
Function
MCX-1000
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