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Are Cypress Serial NOR FLASH memory products SFDP Compliant?
Yes. All Cypress Serial NOR FLASH memory products are SFDP Compliant.
SFDP: Serial FLASH Discoverable Parameters; used exclusively by Serial (SPI) NOR FLASH memory products. The SFDP (JESD-216B) standard provides a consistent method of describing the functional and feature capabilities of serial flash devices in a standard set of internal parameter tables. These SFDP parameter tables can be queried by host system software to enable adjustments needed to accommodate different feature sets from various SPI NOR FLASH manufacturers. The SFDP address space is programmed by Cypress and read-only for the host system.
The READ Serial FLASH Discoverable Parameters (RSFDP), command 5Ah, accesses a separate memory address location and defines the information of the SPI FLASH memory device. The RSFDP command details the attributes of the SPI FLASH memory device, such as, memory density, sector architecture, device and manufacturer’s ID, mode configurations, etc. Core voltage minimum and maximum ranges, as well as maximum ‘timeout’ specifications may also be included for reference.
Although an SPI NOR FLASH memory device may be SFDP compliant, which differs from the term “drop-in replacement.” Confirmed pin-compatibility and electrical-compatibility qualify as direct “drop-in replacement.” An SFDP compliant FLASH device does not necessarily imply
that the command set and feature set, etc., are identical with other SPI NOR FLASH manufacturers. Some SFDP query command definitions and command sets may not be supported or recognized by all other SPI NOR FLASH manufacturers. Therefore, it is recommended to refer to an appropriate datasheet to determine the actual query command definitions, as well as command set for the specific SPI FLASH memory device.
As described below within the Command Support Comparison table, the READ Serial FLASH Discoverable Parameters (RSFDP),
Command 5Ah is common to various SPI NOR FLASH manufacturers: