S25FL256SDPNFAQ datasheet(112/149 Pages) CYPRESS

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S25FL128S/S25FL256S

9.7

One Time Program Array Commands

9.7.1

OTP Program (OTPP 42h)

The OTP Program command programs data in the One Time Program region, which is in a different address space from the main

array data. The OTP region is 1024 bytes so, the address bits from A23 to A10 must be zero for this command. Refer to Section 7.4

OTP Address Space on page 46 for details on the OTP region. The protocol of the OTP Program command is the same as the Page

Program command. Before the OTP Program command can be accepted by the device, a Write Enable (WREN) command must be

issued and decoded by the device, which sets the Write Enable Latch (WEL) in the Status Register to enable any write operations.

To program the OTP array in bit granularity, the rest of the bits within a data byte can be set to 1.

Each region in the OTP memory space can be programmed one or more times, provided that the region is not locked. Attempting to

program zeros in a region that is locked will fail with the P_ERR bit in SR1 set to 1 Programming ones, even in a protected area does

not cause an error and does not set P_ERR. Subsequent OTP programming can be performed only on the un-programmed bits (that

is, 1 data).

Figure 77. OTP Program Command Sequence

DDRDIOR

All array reads allowed in suspend.

4DDRDIOR

All array reads allowed in suspend.

DDRQIOR

All array reads allowed in suspend.

DDRQIOR4

All array reads allowed in suspend.

QIOR

All array reads allowed in suspend.

4QIOR

All array reads allowed in suspend.

QOR

All array reads allowed in suspend.

4QOR

All array reads allowed in suspend.

RDSR1

Needed to read WIP to determine end of suspend process.

RDSR2

Needed to read suspend status to determine whether the operation is

suspended or complete.

READ

All array reads allowed in suspend.

RESET

Reset allowed anytime.

WREN

Required for program command within erase suspend.

WRR

Bank register may need to be changed during a suspend to reach a

sector needed for read or program. WRR is allowed when following

BRAC.

Table 49. Commands Allowed During Program or Erase Suspend (Continued)

Instruction

Name

Instruction

Code (Hex)

Allowed During

Erase Suspend

Allowed During

Program Suspend

Comment

210

031

Instruction

24-Bit

Address

Data Byte 1

Data Byte 2

4552

765

Data Byte 3

Data Byte 512

SCK

MSB

CS#

765

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