參數(shù)資料
型號(hào)： MB86967
廠商： Fujitsu Limited
英文描述： LAN Controller with PC Card, ISA Bus, and General-purpose Bus Interfaces
中文描述： 局域網(wǎng)控制器與PC卡，ISA總線和通用總線接口
文件頁數(shù)： 64/129頁
文件大小： 1499K
代理商： MB86967
64
MB86967
4. Common Memory Space
Common memory space can be used if the capacity of E
2
PROM or flash ROM to be selected is large. The
address space is located higher than the CIS (card attribute data register) of attribute memory space (See
examples of E
2
PROM and flash ROM in 2).
Only even addresses are used in the CIS, but both common memory space even and odd addresses can be
used in common memory space. Only byte access (8 bits) is available.
Writing to common memory space is possible. Efficient writing is performed by data-polling the selected E
2
PROM
or flash ROM. However, in this case, the PwrDwn bit of CCR1 must be not set for the power-down state without
ending writing.
Batch erase should not be selected for flash ROM. When erasing common memory in blocks, take care not to
erase attribute memory space.
(1) Read from Common Memory
(2) Write to Common Memory
Mode
REG
CE2
CE1
OE
WE
PA0
PD8 to
PD15
Invalid
Invalid
PD0 to
PD7
Even byte
Odd byte
ROMS
ROMRD ROMAD
Byte access
(8 bits)
1
1
0
0
1
0
1
L
L
L
L
L
L
Word access
(16 bits)
High byte only
1
0
0
0
1
×
Invalid
Invalid
H
H
L
1
0
1
0
1
×
Invalid
Invalid
H
H
L
Mode
REG
CE2
CE1
OE
WE
PA0
PD8 to
PD15
Don’t care Even byte
Don’t care
PD0 to
PD7
ROMS
ROMRD ROMAD
Byte access
(8 bits)
1
1
0
0
1
0
1
L
L
H
H
L
L
Odd byte
Word access
(16 bits)
High byte only
1
0
0
0
1
×
Don’t care Don’t care
H
H
L
1
0
1
0
1
×
Don’t care Don’t care
H
H
L
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