Method for updating firmware of a computer peripheral device
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United States of America Patent
Stats
-
Jun 26, 2001
Grant Date -
N/A
app pub date -
Jun 15, 1998
filing date -
Jun 21, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An optical disc drive includes a system controller in the form of a microcontroller and a FLASH memory which holds program code for the micro controller. The FLASH memory is formed in two areas, the first being a protected area in which the code cannot be changed and the second being an unprotected area in which the micro controller can write updated program code. The updated code is received from a host computer over an interface (28). The code in the protected area and in the micro controller ROM is sufficient to enable the basic functions of requesting and receiving program code from the host computer and writing the received program code into the unprotected area of the FLASH memory to be performed. This enables recovery of the drive if the code in the unprotected area becomes corrupted, for example if a power supply failure occurs during transfer of the code.
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