S25FL256SDPNFAQ datasheet(113/149 Pages) CYPRESS

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Document Number: 001-98283 Rev. *M

Page 112 of 148

S25FL128S/S25FL256S

9.7.2

OTP Read (OTPR 4Bh)

The OTP Read command reads data from the OTP region. 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 Read command is similar to the Fast Read command except that it will not wrap to the starting address after the OTP address

is at its maximum; instead, the data beyond the maximum OTP address will be undefined. Also, the OTP Read command is not

affected by the latency code. The OTP read command always has one dummy byte of latency as shown below.

Figure 9.36 OTP Read Command Sequence

9.8

Advanced Sector Protection Commands

9.8.1

ASP Read (ASPRD 2Bh)

The ASP Read instruction 2Bh is shifted into SI by the rising edge of the SCK signal. Then the 16-bit ASP register contents is shifted

out on the serial output SO, least significant byte first. Each bit is shifted out at the SCK frequency by the falling edge of the SCK

signal. It is possible to read the ASP register continuously by providing multiples of 16 clock cycles. The maximum operating clock

frequency for the ASP Read (ASPRD) command is 133 MHz.

Figure 9.37 ASPRD Command

Instruction

24-Bit

Address

Dummy Byte

DATA OUT 1

DATA OUT 2

SCK

MSB

High Impedance

MSB

Instruction

SCK

High Impedance

MSB

CS#

MSB

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