Microchip Technology EVB-USB2642, Руководство пользователя

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EVB-USB2642 Evaluation Board User’s Guide
DS50002202A-page 16
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2013 Microchip Technology Inc.
2.2.2 Configuration Source – External SPI Flash
The installed SPI flash is initially blank. In this scenario, the internal firmware will
execute. External firmware updates can be downloaded via USB using the utility
USBDM to the SPI flash. After downloading, the EVB-USB2642 will execute from the
SPI flash.
2.2.3 Configuration Source – External EEPROM
Upon power-up, the EVB-USB2642 looks for an attached EEPROM on its I
2
C interface.
The EVB-USB2642 provides a footprint at U10 where an external EEPROM
(embedded in a DFN8 package of type 24C0x) can be soldered to customize the Media
Controller’s settings. The EEPROM contains 512 bytes of user customizable settings.
Among the settings are Vendor ID, Product ID and Device ID numbers. To use the
EEPROM, the SPI flash device U4 must be removed first.
2.2.4 Configuration Source – USB Upstream
The EEPROM supporting the USB2642 is configured with the USBDM configuration
tool via a USB2642 cable connected to the upstream connector. This tool allows for
modification of Vendor ID, Product ID, Language ID, Device ID and other configuration
settings.
For more information, please see the USBDM manual.
Note: If the SPI flash is installed, the 10.0 k
Ω
pull up resistor R13 must also be
installed.
Note: If the EEPROM is installed, the 10.0 k
Ω
pull up resistor R13 must also be
installed.