IC Memory CardFP2/FP2SH
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7.4 For Use as Expansion Memory
2) When dealing with many different data or other such applications, you can create
a table to store the different control data and easily switch between the data ac−
cording to the data type you are using.
Create a data table in the IC memory card such as outlined above, so that the data is
read to the CPU every time you switch data.
When using the IC memory card as an expanded memory, the DIP switches do not need
to be set, but the access enable switch should be set to “on”.
Configuration of Expanded Memory Field
Fields of the IC memory card that are not formatted can be used as expanded memory
field.
1) Using the entire IC memory card as expansion memory (when there is no DOS
formatted field) The “Card capacity − 1” word portion can be used.
The data of one word (two bytes) can be stored in one address. As the following
example calculation, in 2MB area, data of 1,048,575 words can be stored.
(2 × 1048576) bytes
2
− 1=1,048,575
words
In the expanded memory field , the addresses are numbered by word units and,
regardless of the size of the formatted area, the starting address is numbered as 0 (H0).
For example, the addresses for 1MB (512k words) area are from as H0 to H7FFFE.
Example: When 1MB of SRAM type IC memory card is designated as ex-
pansion memory.
Expanded memory field
(524,287 words)
0
H7FFFE
1MB
Address H
Data 1
IC memory card
Data 2
Data 3
Data 4
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