Renesas TM V.3.20A Spezifikationen PDF herunterladen (Seite 270)

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Renesas Technology, Tools FAQs

Last Updated: August 25, 2000

Document Number: 01051071_e

When memory fragments appear during the MR32R operation, MR32R fails to obtain the necessary memory blocks even though

there are more than enough memory blocks available.

Does MR32R have any memory management function to recover the fragments while the MR32R is in operation?

Yes, MR32R has a function that combines neighboring memory blocks of the same size into a bigger block when a memory block is

released. MR32R sometimes fails to obtain necessary memory blocks even though there are more than enough memory blocks

available, to avoid further fragmentation from happening.

In addition, to speed up the memory allocation process, when a memory-acquisition request is received, the CPU assigns the biggest

fixed memory block that is closest to the size indicated in the request.

For example, when the fixed length memory block size is one of the following,

60bytes(48bytes)

120bytes(108bytes)

240bytes(228bytes)

480bytes(468bytes)

and there is a memory-acquisition request for 100 bytes, the second size, 120 bytes, of fixed memory block will be used.

In the same manner, if there is a memory-acquisition request for 200 bytes, the fourth size, 480 bytes, is divided by 2 and two

240-byte blocks are generated and assigned.

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