lan91c100 Standard Microsystems Corp., lan91c100 Datasheet - Page 31

• Manufacturer Part Number: lan91c100
• Description: Feast ? Ast Ethernet Controller
• Manufacturer: Standard Microsystems Corp.

I/O SPACE - BANK1
This register holds the I/O address decode option chosen for the LAN91C100.
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 LAN91C100's registers. The
64k I/O space is fully decoded by the
LAN91C100 down to a 16 location
BYTE
BYTE
HIGH
LOW
OFFSET
2
A15
0
0
BASE ADDRESS REGISTER
A14
0
0
A13
NAME
0
0
space,
A9
31
1
0
RESERVED
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.
300h (namely, the high byte defaults to 18h).
A8
1
0
READ/WRITE
The I/O base decode defaults to
TYPE
A7
0
0
A6
0
0
It is part of the
SYMBOL
BAR
A5
0
X