Method of firmware update by USB interface
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United States of America Patent
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N/A
Issued Date -
Mar 11, 2004
app pub date -
Sep 5, 2003
filing date -
Sep 5, 2002
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A method of updating in system program (ISP) of an USB device is disclosed. After the USB device is connected to a host and its attribute is recognized by the host, the USB device configuration is set. The microprocessor (mp) in USB device executes the ISP codes stored in the flash memory until a first vendor command 'ISP_START' is sent from the host for updating new ISP codes. The mp is then idled. Afterward, the ISP decoder handled a series of vendor commands until a vendor command 'ISP_RESET' is retrieved. The series of vender commands include 'ISP_INITIAL', 'ISP_ERASE_PAGE', 'ISP_INITIAL', 'ISP_PROGRAM', 'ISP_READ', and 'ISP_RESET' to program new ISP codes. The 'ISP_READ' is to verify the codes programmed.
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