CY7C68300C/CY7C68301C
CY7C68320C/CY7C68321C
Operating Modes
The different modes of operation and EEPROM information are presented in the following sections.
Operational Mode Selection Flow
During the
•If no EEPROM is detected, the AT2LP uses the values in the
is not a valid mode of operation if no factory programming has been done.
•If an EEPROM signature of 0x4D4D is found, the CY7C68300C/CY7C68301C uses the same pinout and EEPROM format as the CY7C68300A
•If an EEPROM signature of 0x534B is found, the AT2LP uses the values stored in the EEPROM to configure the USB descriptors for normal operation.
•If an EEPROM is detected, but an invalid signature is read, the AT2LP defaults into Board Manufacturing Test Mode.
Figure 10. Operational Mode Selection Flow
Check I2C Bus
Signature 0x534B?
Yes
Set
Pinout
EEPROM
Found?
Yes
No Signature 0x4D4D?
Yes
Set
Pinout
No
Load Fused
Memory Data
(AT2LP Pinout)
VBUS_ATA_ENABLE | No |
| |
Pin HIGH? |
|
Yes |
|
ARESET# | No |
Pin LOW? |
|
Yes |
|
DD7 Pin Set |
|
HIGH |
|
ARESET# | No |
| |
Pin HIGH? |
|
Yes |
|
Board Manufacturing | Normal Mass |
Test Mode | Storage Mode |
Document | Page 18 of 42 |
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