MB86967 Datasheet, PDF (55/129 Pages) Fujitsu Component Limited. – LAN Controller with PC Card, ISA Bus, and General-purpose Bus Interfaces

MB86967
s EXPLANATION OF ISA BUS MODE
1. Jumperless ISA Mode
In this mode, the LAN controller reads the I/O addresses and interrupt outputs from initialization data in external
E²PROM after the hardware reset at power-on, and initializes them. It takes about 50 µs until initialization is
completed.
This eliminates the need for on-board DIP switches for address decode selection. The initialization data can be
changed because the E²PROM can be read and written. Utilities for changing initialization data allow an
inexperienced user to retrieve contentions between I/O addresses and mount a LAN interface card in any
personal computer.
Only one byte is used for the initialization data in the E²PROM. Second and later bytes should be used to store
node ID. Data (node ID) at the second and later bytes should be read bit-by-bit, converted to parallel data, and
then written to the node ID registers (DLCR8 to DLCR15).
1.1 Setting at E²PROM
The initial values should be prewritten to the first byte in the E²PROM as shown in Figure 8; the node ID should
be prewritten to the second and later bytes.
After a hardware reset, the LAN controller reads the initialization data at the first one byte in E²PROM
automatically, and sets it at the BMPR19 internal register.
Bit 7
Bit 6
INTSEL1 INTSEL0
Bit 5
Bit 4
Not used
Bit 3
Bit 2
Bit 1
Bit 0
IOSEL2 IOSEL1 IOSEL0
Setting Interrupt Channels
INTSEL1
0
0
1
1
INTSEL0
0
1
0
1
Interrupt Channel (Pin)
IRQ0
IRQ1
IRQ2
IRQ3
Setting I/O Addresses
IOMSEL2 IOMSEL1 IOMSEL0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
I/O Base Address
260H to 27FH
280H to 29FH
2A0H to 2BFH
240H to 25FH
340H to 35FH
320H to 33FH
380H to 39FH
300H to 31FH
Figure 8 Configuration of Bits at First One Byte in E²PROM
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