Method for accessing data being copied between data regions before the copying is completed

A memory system comprising:

• a first data region and a second data region;
• a memory control circuit which accesses a specified data region block in response to an access instruction, copies data in a copy source data region to an intermediate media data region for each prescribed block unit in response to a copy instruction, and copies the data copied to the intermediate media data region to a copy destination data region provided in another memory system, the memory control circuit comprising:
• a copy source data updating part which updates the access target block in the copy source data region after copying data stored in the access target block in the copy source data region to the intermediate media data region when the access is for updating a block for which copying of the copy source data is not yet complete,
• a copy destination data referencing part for making a reference access to the block for which copying of the copy destination data region is not yet complete, and
• a copy destination data updating part for making an update access to the block for which copying of the copy destination region is not yet complete, the copy destination data reference part comprising:
• a source reference part referencing data in the copy source data region when the access is for referencing a block for which copying of data to the intermediate media data region from the copy source data region is not yet complete and for which copying of the copy destination data region is not yet complete, and
• an intermediate data referencing part referencing data in the intermediate media data region and data in the copy origin data region when the access is for referencing a block for which copying of data in the intermediate media data region from the copy source data region is complete and for which copying of the copy destination data region is not yet complete;
• and
• the copy destination data updating part comprising:
• an intermediate updating part prohibiting data in the intermediate media data region from being updated and copied from the copy source data region to a block storing that data, and prohibiting updating of the access target block in the copy destination data region and copying to that block when the access is for updating a block for which copying of data in the intermediate media data region from the data source data region is not yet complete and for which copying of the copy destination data region is not yet complete, and
• a destination updating part prohibiting updating of the access target block in the copy destination data region and copying to that block when the access is for updating a block for which copying to the intermediate media data region from the copy source data region is complete and for which copying of the copy destination data region is not yet complete.

A processing method for copying between memory device data regions comprising:

• an initialization method for a specified target data region carried out in response to an initialization instruction;
• a process initializing an initialization target region for each prescribed block unit in response to an initialization instruction;
• and
• a process interrupting the initialization processing for an external access to a block in the initialization target region during the initialization processing and processing the access, said process interrupting comprising:
• a process prohibiting updating of the access target block in the initialization target region for an access to update a block for which the initialization of the initialization target region is not yet complete and copying to that block, and
• a process acknowledging initialization data established beforehand for an access to reference a block for which the initialization of the initialization target region is not yet complete, or to reference the target block after executing the initialization of that block.

A memory system comprising:

• a first data region, and
• a memory control circuit accessing a specified data region block in response to an access instruction and initializing an initialization target region for each prescribed block unit in response to an initialization instruction, the memory control circuit comprising:
• a data updating part prohibiting updating of an access target block in the initialization target region for an access to update the block for which initialization of the initialization target region is not yet complete and copying to that region, and
• a data referencing part acknowledging initialization data established beforehand for an access to reference a block for which the initialization of the initialization target region is not yet complete, or to reference the target block after executing initialization of the target block.

A method for copying data of a computer system, said method comprising:

• copying the data from a source region of a memory to an intermediate region of a memory;
• copying the data from the intermediate region to a destination region of a memory;
• and
• accessing the data from one of the source region and the intermediate region if the copying of the data from the source region to the intermediate region is complete and the copying of the data from the intermediate region to the destination region is incomplete.