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參數(shù)資料
| 型號(hào)： | UM_S3C49F9X |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | S3C49F9X User’s Manual |
| 中文描述： | S3C49F9X用戶手冊(cè) |
| 文件頁(yè)數(shù)： | 37/74頁(yè) |
| 文件大?。?/td> | 653K |
| 代理商： | UM_S3C49F9X |
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S3C49F9X SOLID DISK CONTROLLER CARD CONFIGURATION
36
4.7 Common Memory Transfer Function
4.7.1 Common Memory Function
The common memory transfer to or from the PC Card can be either 8 or 16 bits. The PC Card permits
both 8 and 16 bit accesses to all of its common memory addresses.
The PC Card may request the host to extend the length of a memory write cycle or extend the length of a
memory read cycle until data is ready by asserting the –WAIT signal at the start of the cycle.
Table 4-7 Common Memory Function
Function Mode
-REG -CE2 -CE1
×
H
H
H
H
A0
×
L
H
-OE
×
L
L
-WE
×
H
H
D15-D8
D7-D0
Standby Mode
H
High Z
High Z
Byte Read Access
(8 bits)
H
L
L
High Z
High Z
Even Byte
Odd Byte
Byte Write Access
(8 bits)
H
H
H
H
L
L
L
H
×
H
H
L
L
Don't Care
Don't Care
Even Byte
Odd Byte
Word Read Access
(16 bits)
H
L
L
L
H
Odd Byte
Even Byte
Word Write Access
(16 bits)
H
L
L
×
H
L
Odd Byte
Even Byte
Odd Byte Read Only
(8 bits)
H
L
H
×
L
H
Odd Byte
High Z
Odd Byte Write Only
(8 bits)
H
L
H
×
H
L
Odd Byte
Don't Care
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