参数资料
型号: HB28H016RM2
英文描述: IC Memory CompactFlash /PC-ATA Standard Users Manual/Device
中文描述: 集成电路记忆的CompactFlash / PC的ATA标准用户手册/设备
文件页数: 20/103页
文件大小: 466K
代理商: HB28H016RM2
14
MPU
Flash
memory
Flash
memory
Flash card
Control
logic
Registers
MPU
Work memory
(Min. 512 bytes)
Address
When using EP/EEPROM memory...
Small-scale/specific use, etc.
Systems in which states do not change greatly and
only a few variables have to be stored
Advantage
Data can be written and read simply by setting
the address and controlling the control pins.
Disadvantage
If the capacity or manufacturer is changed, the
peripheral circuitry must be redesigned.
Large-scale/general use
Systems in which many system state variables have
to be stored and managed
When using a flash card...
Control
Data
3 or 4 signals:
CS
,
WE
,
OE
, PGM
Many signals:
CS
,
WE
,
OE
,
IORD
,
IOWR
, REG, etc.
Control
Address
Intermediary chip set
may also be used
Intel 82365
compatible product
Data
Sector reads
Advantages
The same interface circuit can be used even if the memory
capacity is changed.
Large-capacity memory can be installed comparatively easily,
and memory capacity can be selected in a scalable fashion.
Disadvantage
System configuration
and control programs
are complex.
Figure 3.2 Differences in System Size and Features with Use of a Card and Memory
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