Cypress Semiconductor CY7C68301C Uživatelský manuál stáhnout pdf (Strana 21)

CY7C68300C, CY7C68301C

CY7C68320C, CY7C68321C

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

EEPROM Organization

The contents of the recommended 256-byte (2048-bit) I

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 (such as 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 recommended 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

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Cypress Semiconductor CY7C68301C Uživatelský manuál Strana 21