Cypress CY7C68300C/CY7C68301C CY7C68320C/CY7C68321C, EEPROM-related Vendor-specific Commands

CY7C68300C/CY7C68301C

CY7C68320C/CY7C68321C

Legal values for wValue are as follows:

•0x0000 Internal Config bytes, address range 0x2 – 0xF

•0x0002 External I2C memory device

Internal Config byte writes must be constrained to addresses 0x2 through 0xF, as shown in Table 12. Attempts to write outside this address space result in undefined operation. Internal Config byte writes only overwrite AT2LP Configuration Byte registers, the original data source (I2C memory device) remains unchanged.

Table 12.EEPROM-related Vendor-specific Commands

Label	bmRequestType	bRequest	wValue	wIndex	wLength	Data
LOAD_CONFIG_DATA	0x40	0x01	0x0000	30x02 – 0x0F	Data Length	Configuration
						Data
READ_CONFIG_DATA	0xC0	0x02	Data Source	Starting Address	Data Length	Configuration
						Data

READ_CONFIG_DATA

This USB request allows data retrieval from the data source specified by the wValue field. Data is retrieved beginning at the address specified by the wIndex field (see Table 12). The wLength field denotes the length in bytes of data requested from the data source.

Legal values for wValue are as follows:

•0x0000 Configuration bytes, addresses 0x0 – 0xF only

•0x0002 External I2C memory device

Illegal values for wValue result in an undefined operation. Attempted reads from an I2C memory device when none is connected result in an undefined operation. Attempts to read configuration bytes with starting addresses greater than 0xF also, result in an undefined operation.

Document 001-05809 Rev. *A Page 34 of 42

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