
EZ-USB FX2 Technical Reference Manual
Page 13-18 EZ-USB FX2 Technical Reference Manual v2.1
After determining whether a one- or two-byte-address EEPROM is attached, the FX2 reports its
results in the ID1 and ID0 bits, as shown in Table 13-12.
Additional EEPROM devices (with slave address of 1010) can be attached to the I²C-compatible
bus for general-purpose use, as long as they are strapped for device addresses other than 000 or
001.
The 24LC00 EEPROM is a special case, because it responds to all eight device addresses. If a
24LC00 is used for boot loading, no other EEPROMS with device address 1010 may be used.
Table 13-12. Results of Power-On-Reset EEPROM Test
ID1 ID0 Meaning
0 0 No EEPROM detected
0 1 One-byte-address load EEPROM detected
1 0 Two-byte-address load EEPROM detected
1 1 Not used
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