S25FL256SDPNFAQ datasheet(73/149 Pages) CYPRESS

73 / 149 page

Document Number: 001-98283 Rev. *M

Page 72 of 148

S25FL128S/S25FL256S

9.2.2

Read Identification (RDID 9Fh)

The Read Identification (RDID) command provides read access to manufacturer identification, device identification, and Common

Flash Interface (CFI) information. The manufacturer identification is assigned by JEDEC. The CFI structure is defined by JEDEC

standard. The device identification and CFI values are assigned by Cypress.

The JEDEC Common Flash Interface (CFI) specification defines a device information structure, which allows a vendor-specified

software flash management program (driver) to be used for entire families of flash devices. Software support can then be device-

independent, JEDEC manufacturer ID independent, forward and backward-compatible for the specified flash device families.

System vendors can standardize their flash drivers for long-term software compatibility by using the CFI values to configure a family

driver from the CFI information of the device in use.

Any RDID command issued while a program, erase, or write cycle is in progress is ignored and has no effect on execution of the

program, erase, or write cycle that is in progress.

The RDID instruction is shifted on SI. After the last bit of the RDID instruction is shifted into the device, a byte of manufacturer

identification, two bytes of device identification, extended device identification, and CFI information will be shifted sequentially out on

SO. As a whole this information is referred to as ID-CFI. See Section 7.3 ID-CFI Address Space on page 46 for the detail description

of the ID-CFI contents.

Continued shifting of output beyond the end of the defined ID-CFI address space will provide undefined data. The RDID command

sequence is terminated by driving CS# to the logic high state anytime during data output.

The maximum clock frequency for the RDID command is 133 MHz.

Figure 9.1 Read Identification (RDID) Command Sequence

9.2.3

Read Electronic Signature (RES) (ABh)

The RES command is used to read a single byte Electronic Signature from SO. RES is only supported for backward compatibility

and should not be used for new software designs. New software designs should instead make use of the RDID command.

The RES instruction is shifted in followed by three dummy bytes onto SI. After the last bit of the three dummy bytes are shifted into

the device, a byte of Electronic Signature will be shifted out of SO. Each bit is shifted out by the falling edge of SCK. The maximum

clock frequency for the RES command is 50 MHz.

The Electronic Signature can be read repeatedly by applying multiples of eight clock cycles.

The RES command sequence is terminated by driving CS# to the logic high state anytime during data output.

Table 46. Read_ID Values

Device

Manufacturer ID (hex)

Device ID (hex)

S25FL128S

S25FL256S

646

210

Instruction

645

652

655

654

653

SCK

High Impedance

Extended Device Information

CS#

644

647

Manufacturer / Device Identification

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