SMC256BFY6E NUMONYX [Numonyx B.V], SMC256BFY6E Datasheet - Page 39
SMC256BFY6E
Manufacturer Part Number
SMC256BFY6E
Description
Manufacturer
NUMONYX [Numonyx B.V]
Datasheet
1.SMC256BFY6E.pdf
(91 pages)
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SMCxxxBF
6.6
I/O Transfer Function
The I/O transfer to or from the Card can be either 8 or 16 bits. When a 16 bit accessible
port is addressed, the
When a 16 bit transfer is attempted, and the
generate a pair of 8 bit references to access the Word’s even and odd Bytes. The Card
permits both 8 and 16 bit accesses to all of its I/O addresses, so
addresses (see
Table 33.
Word Output Access
High Byte Input Only
Byte Output Access
.
Word Input Access
Byte Input Access
High Byte Output
Function Code
I/O Read Inhibit
I/O Write Inhibit
Standby Mode
(16 bits)
(16 bits)
(8 bits)
(8 bits)
(8 bits)
(8 bits)
Only
I/O Function
Table
–REG –CE2
33).
–
X
H
H
L
L
L
L
L
L
L
L
IOIS16 signal is asserted by the Card, otherwise it is de-asserted.
H
H
H
H
H
X
X
L
L
L
L
–CE1 A0
H
X
X
H
H
L
L
L
L
L
L
X
H
H
X
X
X
X
–
L
L
L
L
IOIS16 signal is not asserted, the system must
–IORD
X
H
H
H
H
H
L
L
L
L
L
–IOWR
X
H
H
H
H
H
L
L
L
L
L
–
Don’t Care
Don’t Care
Don’t Care
D15 to D8
IOIS16 is asserted for all
Odd Byte
Odd Byte
Odd Byte
Odd Byte
High Z
High Z
High Z
High Z
Card Configuration
Don’t Care
Don’t Care
Even Byte
Even Byte
Even Byte
Even Byte
Odd Byte
Odd Byte
D7 to D0
High Z
High Z
High Z
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