AX88196
Local CPU BUS MAC Controller
5.0 CPU I/O Read and Write Functions
The AX88196 supports four kinds of CPU/BUS types access function, including ISA, 80186, MC68000 and MCS-
51. These Access methods are described as the following sections.
5.1 ISA bus type access functions.
ISA bus I/O Read function
Function Mode
Standby Mode
Byte Access
/CS
H
L
L
L
/BHE
X
H
H
L
A0
X
L
H
L
/IORD
/IOWR
SD[15:8]
High-Z
Not Valid
Not Valid
Odd-Byte
SD[7:0]
High-Z
Even-Byte
Odd-Byte
Even-Byte
X
L
L
L
X
H
H
H
Word Access
ISA bus I/O Write function
Function Mode
Standby Mode
Byte Access
/CS
H
L
L
L
/BHE
X
H
H
L
A0
X
L
H
L
/IORD
/IOWR
SD[15:8]
SD[7:0]
X
Even-Byte
Odd-Byte
Even-Byte
X
H
H
H
X
L
L
L
X
X
X
Word Access
Odd-Byte
5.2 80186 CPU bus type access functions.
80186 CPU bus I/O Read function
Function Mode
Standby Mode
Byte Access
/CS
H
L
L
L
/BHE
X
H
L
L
A0
X
L
H
L
/IORD
/IOWR
SD[15:8]
High-Z
Not Valid
Odd-Byte
Odd-Byte
SD[7:0]
High-Z
Even-Byte
Not Valid
Even-Byte
X
L
L
L
X
H
H
H
Word Access
80186 CPU bus I/O Write function
Function Mode
Standby Mode
Byte Access
/CS
H
L
L
L
/BHE
X
H
L
L
A0
X
L
H
L
/IORD
/IOWR
SD[15:8]
X
SD[7:0]
X
Even-Byte
X
X
H
H
H
X
L
L
L
X
Odd-Byte
Odd-Byte
Word Access
Even-Byte
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ASIX ELECTRONICS CORPORATION
ASIX [ ASIX ELECTRONICS CORPORATION ]
