公开(公告)号：MY118820A

公开(公告)日：2005-01-31

申请号：MYPI9800731

申请日：1998-02-20

Applicant: IBM

Inventor： KANAMARU ATSUSHI ,  KAKIHARA TOSHIO ,  KIGAMI YUHJI ,  SAITOH TAKAHIRO

IPC: G06F12/08 ,  G06F3/06

Abstract: A DISK DRIVE AND A METHOD FOR CONTROLLING THE DISK DRIVE IN WHICH AN ADDITIONAL READ FROM A MEDIUM CAN BE PERFORMED AS NEEDED WHILE MINIMIZING THE COMMAND OVERHEAD TO THE MINIMUM. IN A DISK DRIVE DEVICE (10), EVEN IF A READ COMMAND IS ISSUED, AND ALL THE REQUIRED DATA IS STORED IN THE CACHE MEMORY SUCH THAT THE DATA TRANSFER CAN BE PERFORMED WITHOUT THE INTERVENTION OF A LOCAL MPU (16), A HIC (15) PERFORMS THE DATA TRANSFER SO AS TO LEAVE THE LAST ONE BLOCK AND WAITS FOR THE INTERVENTION OF THE LOCAL MPU (16). THE LOCAL MPU (16) PROVIDES INSTRUCTIONS TO TRANSFER THE LAST ONE BLOCK WHEN THE PREPARATION FOR THE COMMAND TERMINATION IS COMPLETED, AND IF A PLURALITY OF BLOCKS OF DATA TO BE TRANSFERRED ARE REMAINING WHEN THE LOCAL MPU (16) INSTRUCTS THE HIC (15) TO TRANSFER THE LAST ONE BLOCK, THE HIC (15) EXECUTES ALL THE DATA TRANSFER WITHOUT STOPPING THE DATA TRANSFER BEFORE THE LAST ONE BLOCK, COMPLETING THE COMMAND.FIGURE 1