CYUSB3KIT-001 EZ-USB FX3 Development Kit Guide, Doc. #: 001-70237 Rev. *C
45
Kit Operation
3.7
I
2
C Boot
The FX3 DVK board provides an I
2
C interface as one of the boot options. Mount an I
2
C EEPROM
(for e.g., 24LC1025 or 24LC1026) into the U44 socket and verify this feature by programming the
firmware image. The size of the selected EEPROM should be of at least 128 KB capacity.
3.7.1
Download Firmware Image to I
2
C EEPROM
Follow the procedure outlined here to download the firmware image to I2C EEPROM:
1. Disconnect the USB cable between the USB host PC and FX3 DVK board.
2. Enable USB boot by setting the PMODE[2:0] pins to Z11. On the DVK board, this is done by
configuring the jumpers and switches, as shown in
Table 3-5
.
3. Verify the firmware image (.img) size before downloading to EEPROM. To select the EEPROM of
correct configuration, see
Choosing the Correct I2C EEPROM Configuration on page 48
.
4. Mount the selected I
2
C EEPROM onto the FX3 board. Verify that the EEPROM pin 1 indicator
lines up with the board pin 1 triangle and is firmly fixed in the U44 socket.
Figure 3-11
shows an
I
2
C EEPROM mounted into the U44 socket.
Figure 3-11. I
2
C EEPROM Mounted into U44 Socket
Table 3-5. USB Boot Jumper and Dipswitch Settings
PMODE Pin
Required PMODE
Pin State
Jumper and Dip Switch Combination
PMODE2
Z
1. No jumper installed on J98
2. SW25.3 – Don't care (the switch can be either turned ON or OFF)
PMODE1
1
1. Short pins 2–3 of jumper J97
2. SW25.2 set to OFF
PMODE0
1
1. Short pins 2–3 of jumper J96
2. SW25.1 set to OFF
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