Cypress specifications CY7C68300C/CY7C68301C CY7C68320C/CY7C68321C, EEPROM Organization

CY7C68300C/CY7C68301C

CY7C68320C/CY7C68321C

EEPROM Organization

The contents of the recommended 256-byte (2048-bit) I2C EEPROM are arranged as follows. In Table 11, the column labeled ‘Required Contents’ contains the values that must be used for proper operation of the AT2LP. The column labeled ‘Variable Contents’ contains suggested entries and values that may vary (like string lengths) according to the EEPROM data. Some values, such as the Vendor ID, Product ID and device serial number, must be customized to meet USB compliance. The ‘AT2LP Blaster’ tool in the CY4615C kit can be used to edit and program these values into an AT2LP-based product (refer to Figure 11). The ‘AT2LP Primer’ tool can be used to

program AT2LP-based products in a manufacturing environment and provides for serial number randomization. See “Board Manufacturing Test Mode” on page 19 for details on how to use vendor-specific ATAPI commands to read and program the EEPROM.

The address pins on the serial EEPROM must be set such that the EEPROM is at physical address 2 (A0 = 0, A1 = 1, A2 = 0) or address 4 (A0 = 0, A1 = 0, A2 = 1) for EEPROM devices that are internally byte-addressed memories. It is recom- mended that the address pins be set this way even on EEPROMs that may indicate that the address pins are internal no-connects.

Figure 11. Snapshot of ‘AT2LP Blaster’ Utility

Document 001-05809 Rev. *A Page 21 of 42

[+] Feedback