S25FS256S datasheet(91/154 Pages) SPANSION

91 / 154 page

November 6, 2013 S25FS-S_00_04

S25FS-S Family

Da ta

Shee t

(Prelim i nar y )

10.1.8

OTP, Block Protection, and Advanced Sector Protection

There are commands to read and program a separate One-Time Programmable (OTP) array for permanent

data such as a serial number. There are commands to control a contiguous group (block) of flash memory

array sectors that are protected from program and erase operations. There are commands to control which

individual flash memory array sectors are protected from program and erase operations.

10.1.9

Reset

There are commands to reset to the default conditions present after power-on to the device. However, the

software reset commands do not affect the current state of the FREEZE or PPB Lock bits. In all other

respects a software reset is the same as a hardware reset.

There is a command to reset (exit from) the Continuous Read mode.

10.1.10

Reserved

Some instructions are reserved for future use. In this generation of the S25FS-S family some of these

command instructions may be unused and not affect device operation, some may have undefined results.

Some commands are reserved to ensure that a legacy or alternate source device command is allowed

without effect. This allows legacy software to issue some commands that are not relevant for the current

generation S25FS-S family with the assurance these commands do not cause some unexpected action.

Some commands are reserved for use in special versions of the FS-S not addressed by this document or for

a future generation. This allows new host memory controller designs to plan the flexibility to issue these

command instructions. The command format is defined if known at the time this document revision is

published.

10.2

Identification Commands

10.2.1

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 Spansion.

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

Device ID and Common Flash Interface (ID-CFI) Address Map on page 143 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.

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