Cache-data transfer system

A cache-data transfer system comprising:

• storage means for storing programs and data to be processed;
• a microprocessor operated in accordance with the programs and using the data, said microprocessor comprising an internal cache memory comprising a number of first blocks, each of the first blocks comprising M words, said internal cache memory receiving and storing the data consecutively stored in the storage means, wherein M is an integer;
• an external cache memory coupled to the microprocessor and comprising a number of second blocks, each of the second blocks comprising N words, said external cache memory receiving and storing the data consecutively stored in the storage means, wherein N is an integer larger than M;
• and
• memory control means for controlling a data transfer process transferring data from the storage means to the internal cache memory and the external cache memory according to the following sequence:
• first, said memory control means consecutively transferring data corresponding to up to M-1 words from the storage means to one of said first blocks of the internal cache memory and to one of said second blocks of the external cache memory leaving a space of at least one word-unit in said one of said first blocks and said one of said second blocks empty,
• second, said memory control means consecutively transferring data corresponding to up to N-M words from the storage means only to said one of said second blocks of the external cache memory, and
• third, said memory control means consecutively transferring data corresponding to at least one word to the empty word-unit of said one of said first blocks of the internal cache memory and that of said one of said second blocks of the external cache memory,
• said microprocessor executing a next data transfer process after said empty word-unit in said one of said first blocks of the internal cache memory receives the data from the storage means.