Question: How do you make FX2LP™ (128-pin package) enumerate from off-chip memory?
The EZ-USB® executes the code from off-chip memory only under the following three conditions:
- A flash, EEPROM, or other memory is attached to the address/data bus.
- The EEPROM connected to I2C lines does not have a valid first byte (0xC0 or 0xC2).
- The EA pin of FX2LP is connected to logic high.
Note: If the connected off-chip memory does not have firmware, then it will not enumerate as the default device.
Figure 1. EA Pin Connected to Logic High