EVB-USB7206
EVALUATION KIT
USER’S GUIDE
2019 Microchip Technology Inc.
DS50002937A-page 15
Chapter 3. EVB-USB7206 Evaluation Kit
3.1
HARDWARE CONFIGURATION OPTIONS
shows the top view of the EVB-USB7206.
FIGURE 3-1:
EVB-USB7206 REV B (TOP VIEW)
3.1.1
Configuration
3.1.1.1
EXTERNAL SPI FLASH
Upon power-up, the USB7206 first looks for an external SPI ROM device and a valid
signature in the Flash. If one is found, the external ROM is enabled and code execution
is initiated from the external SPI ROM device.
To enable operation from the SPI device, install shunts to pins 1–2 and 3–4 of J7. When
code is executing from an SPI ROM device, a blue LED “SPI-ACTIVE” (D8) illuminates.
3.1.1.2
INTERNAL DEFAULT CONFIGURATIONS WITH STRAPPING OPTIONS
When the USB7206 does not detect a valid SPI Flash image and does not look for
SMBus2 configuration upon power-up, the USB7206 uses internal default register set
-
tings. It also sets the Vendor ID, Product ID, Language ID, Device ID, and additional
settings from the internal ROM code.
If configuration is not done through SPI or SMBus2, additional configuration is available
through two functions: CFG_BC_EN and CFG_NON-REM. The controls are config
-
ured by selecting one of the six resistor values for each pin. The EVB-USB7206
Note 1:
CFG_BC and CFG_Non-Rem options are deselected when SPI shunts
are installed on J10. When operating in SPI mode, all configuration is
handled by the code executing from the SPI ROM device.
2:
If the SPI Flash is not properly programmed or has an invalid signature,
the USB7206 reverts to internal defaults even if the SPI ROM is selected.
