Patent
1994-12-07
1997-08-19
Harvey, Jack B.
395825, 395892, 395894, G06F 1300
Patent
active
056598017
ABSTRACT:
A peripheral device capable of replacing resident microcode with new microcode by download by an application program is disclosed. The disclosed peripheral device comprises a non-volatile memory containing the resident microcode. Further circuitry is responsive to the application program for receiving peripheral device commands. A resident processor, which is coupled to the non-volatile memory and the receiving circuitry, is responsive to the resident microcode, and includes a detector for a received initiator peripheral device command. The resident processor also includes a detector for a transfer disk drive command, which includes the new microcode, and which is received while the disk drive is in a waiting state. Further circuitry is coupled between the receiving circuitry and the non-volatile memory and is responsive to the resident processor, for entering the waiting state when an initiator command is detected, and for transferring the new microcode from the receiving circuitry into the nonvolatile memory and restarting the operation of the disk drive when a transfer disk drive command is detected. A method for operating a disk drive to replace resident microcode with new microcode by download by an application program, and an application program for replacing resident microcode in such a disk drive with new microcode by download are also disclosed.
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ANSI X3.131-1994 "Small Computer Interface -2" Jan. 31, 1994.
Caracappa David N.
EMC Corporation
Harvey Jack B.
Travis John
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