Data processing system, data processing method, computer-readable storage medium, and disk drive

A data processing system including a data output processing unit that processes and transmits serial data transferred in units of a block over a serial bus in order of issuance of a data output instruction from one processor or issuance of a data output instruction responsive to an external interrupt, wherein:

• the serial data includes first serial data containing usable information, and second serial data with which an address of a bank, in which the first serial data is stored, is designated;
• the data output processing unit comprises a second serial data holding means for temporarily holding the second serial data included in the serial data transferred from the processor, and a second serial data comparing means for comparing a designative value represented by current second serial data, which is currently held in the second serial data holding means, with a designative value represented by the last second serial data that is immediately previously held in the second serial data holding means;
• and
• if the second serial data comparing means verifies that the designative value of the current second serial data agrees with the designative value of the last second serial data, the current second serial data is not transmitted but only the first serial data included in the block including the current second serial data is transmitted.

A data processing method for processing and transmitting serial data transferred over a serial bus in order of issuance of a data output instruction from at least one processor, wherein the serial data includes first serial data containing usable information, and second serial data with which an address of a bank, in which the first serial data is stored, is designated, the data processing method comprising:

• a step of temporarily holding the second serial data included in the serial data transferred from the processor;
• a step of comparing a designative value represented by current second serial data, which is currently held, with a designative value represented by the last second serial data that is immediately previously held;
• and
• a step of, if the designative value of the current second serial data is verified to agree with the designative value of the last second serial data, transmitting only the first serial data included in the block including the current second serial data without transmitting the current second serial data.

A computer-readable storage medium in which a program is stored, wherein the program allows a computer, which processes and transmits serial data on the assumption that the serial data transferred in units of a block over a serial bus in order of issuance of a data output instruction from at least one processor includes first serial data containing usable information, and second serial data with which an address of a bank, in which the first serial data is stored, is designated, to:

• temporarily hold the second serial data included in the serial data transferred from the processor;
• compare a designative value represented by current second serial data, which is currently held, with a designative value represented by the last second serial data that is immediately previously held;
• and
• if the designative value of the current second serial data is verified to agree with the designative value of the last second serial data, transmit only the first serial data included in the block including the current second serial data without transmitting the current second serial data.

A disk drive including a disk driver which drives a disk so that the disk can rotate, a head driver which drives a head so that the head will reciprocate between the innermost position on the disk and the outermost position thereon, and a plurality of processors which controls various motions including a motion of writing information at any position on the disk using the head, and a motion of reading information written at any position, the disk drive comprising:

• a data output processing unit that processes and transmits serial data transferred in units of a block over a common serial bus in order of issuance of a data output instruction from the plurality of processors, wherein:
• the serial data includes first serial data containing usable information and second serial data with which an address of a bank, in which the first serial data is stored, is designated;
• the data output processing unit comprises a second serial data holding means for temporarily holding the second serial data included in the serial data transferred from the plurality of processors, and a second serial data comparing means for comparing a designative value represented by current second serial data, which is currently held in the second serial data holding means, with a designative value represented by the last second serial data that is immediately previously held in the second serial data holding means;
• and
• if the second serial data comparing means verifies that the designative value of the current second serial data agrees with the designative value of the last second serial data, the current second serial data is not transmitted but only the first serial data included in the block including the current second serial data is transmitted.

A disk drive comprising a disk driver which drives a disk so that the disk can rotate, a head driver which drives a head so that the head will reciprocate between the innermost position on the disk and the outermost position thereon, and one processor which controls various motions including a motion of writing data at any position on the disk using the head, and a motion of reading data written at any position, the disk drive further comprising:

• a data output processing unit that processes and transmits serial data transferred in units of a block over a serial bus in order of issuance of a data output instruction from one processor or issuance of a data output instruction responsive to an external interrupt, wherein:
• the serial data includes first serial data containing usable information and second serial data with which an address of a bank, in which the first serial data is stored, is designated;
• the data output processing unit comprises a second serial data holding means for temporarily holding the second serial data included in the serial data transferred from the processor, and a second serial data comparing means for comparing a designative value represented by current second serial data, which is currently held in the second serial data holding means, with a designative value represented by the last second serial data that is immediately previously held in the second serial data holding means;
• and
• if the second serial data comparing means verifies that the designative value of the current second serial data agrees with the designative value of the last second serial data, the current second serial data is not transmitted but only the first serial data included in the block including the current second serial data is transmitted.