LAN91C111-NU Standard Microsystems (SMSC), LAN91C111-NU Datasheet - Page 55

• Manufacturer Part Number: LAN91C111-NU
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LAN91C111-NU

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3.135V
• Operating Supply Voltage (max): 3.465V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Compliant

10/100 Non-PCI Ethernet Single Chip MAC + PHY
Datasheet
SMSC LAN91C111 REV C
8.12
8.13
A15
0
BYTE
BYTE
HIGH
LOW
A14
0
Bank 1 - Base Address Register
Bank 1 - Individual Address Registers
This register holds the I/O address decode option chosen for the LAN91C111. It is part of the EEPROM
saved setup and is not usually modified during run-time.
A15 - A13 and A9 - A5 - These bits are compared against the I/O address on the bus to determine
the IOBASE for the LAN91C111‘s registers. The 64k I/O space is fully decoded by the LAN91C111
down to a 16 location space, therefore the unspecified address lines A4, A10, A11 and A12 must be
all zeros.
All bits in this register are loaded from the serial EEPROM. The I/O base decode defaults to 300h
(namely, the high byte defaults to 18h).
Reserved – Reserved bits.
Below chart shows the decoding of I/O Base Address 300h:
These registers are loaded starting at word location 20h of the EEPROM upon hardware reset or
EEPROM reload. The registers can be modified by the software driver, but a STORE operation will not
modify the EEPROM Individual Address contents. Bit 0 of Individual Address 0 register corresponds
to the first bit of the address on the cable.
A13
0
A15
0
0
THROUG
OFFSET
OFFSET
H 9
A12
0
2
4
A14
A11
0
0
0
INDIVIDUAL ADDRESS
BASE ADDRESS
A10
0
REGISTERS
REGISTER
NAME
NAME
A13
0
0
A9
1
DATASHEET
A8
1
Reserved
A9
55
1
0
A7
0
READ/WRITE
READ/WRITE
A6
0
TYPE
TYPE
A8
1
0
A5
0
A4
0
A7
0
0
SYMBOL
SYMBOL
BAR
IAR
A3
0
Revision 1.91 (06-01-09)
A6
A2
0
0
0
A1
0
Reserved
A5
0
1
A0
0