Renesas TM V.3.20A Spezifikationen PDF herunterladen (Seite 271)

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Renesas Technology, Tools FAQs

Last Updated: August 25, 2000

Document Number: 01051072_e

In the MR32R User's Manual, Section 3.5.11 Memory Pool Management Function, the subsection concerning 'variable length

memory pool management function' says: the specified maximum acquisition size of a memory block is 400B. But the actual block

acquired becomes more than specified size, 400B. Why is that?

The MR32R calculates 4 types of fixed-length memory block sizes, based on the specified maximum acquisition size, in the

following order.

Calculation method of minimum size:

( (max. acquisition size + (memory management area - 1) ) / 96+1 ) * memory management area

*The memory management area is for all fixed-length blocks management and, therefore, requires 12 bytes.

Calculate the four fixed-length block sizes by multiplying the minimum size by 1, 2, 4 or 8.2.

For example, when the maximum acquisition size is set at 400B, the fixed-length memory block size to be acquired is calculated in

the following manner:

1st size (minimum size): ((400+(12-1))/96+1)*12=60

2nd size (2 * min. size) : 120bytes(108bytes)

3rd size (4 * min. size) : 240bytes(228bytes)

4th size (8 * min. size) : 480bytes(468bytes)

Therefore, the actual acquired fixed-length block size may be bigger than the specified maximum size.

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