參數(shù)資料
型號: SDCFBI-30-101
廠商: SANDISK CORP
元件分類: 存儲控制器/管理單元
英文描述: FLASH MEMORY DRIVE CONTROLLER, XMA50
封裝: PC CARD-50
文件頁數(shù): 65/124頁
文件大?。?/td> 769K
代理商: SDCFBI-30-101
CompactFlash Memory Card Product Manual
SanDisk CompactFlash Memory Card Product Manual 1999 SANDISK CORPORATION
45
4.5
I/O Transfer Function
4.5.1
I/O Function
The I/O transfer to or from the CompactFlash
Memory Card can be either 8 or 16 bits. When a
16-bit accessible port is addressed, the signal
-IOIS16 is asserted by the CompactFlash Card.
Otherwise, the -IOIS16 signal is de-asserted.
When a 16 bit transfer is attempted, and t h e
-IOIS16
signal
is
not
asserted
by
t h e
CompactFlash Card, the system must generate a
pair of 8-bit references to access the words even
byte and odd byte. The CompactFlash Card
permits both 8 and 16 bit accesses to all of its I/O
addresses, so -IOIS16 is asserted for all addresses
to which the CompactFlash Card responds.
The CompactFlash Memory Card may request t h e
host to extend the length of an input cycle until
data is ready by asserting the -WAIT signal a t
the start of the cycle.
Table 4-15 I/O Function
Function Code
-REG
-CE2
-CE1
A 0
-IORD
-IOWR
D15-D8
D7-D0
Standby Mode
X
H
X
High Z
Byte Input Access
(8 bits)
L
H
L
H
L
H
High Z
Even-Byte
Odd-Byte
Byte Output
Access
(8 bits)
L
H
L
H
L
Don't Care
Even-Byte
Odd-Byte
Word Input
Access
(16 bits)
L
H
Odd-Byte
Even-Byte
Word Output
Access
(16 bits)
L
H
L
Odd-Byte
Even-Byte
I/O Read Inhibit
H
X
L
H
Don't Care
I/O Write Inhibit
H
X
H
L
High Z
High Byte Input
Only
(8 bits)
L
H
X
L
H
Odd-Byte
High Z
High Byte Output
Only
(8 bits)
L
H
X
H
L
Odd-Byte
Don't Care
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