JS28F256P30B95A datasheet(48/97 Pages) MICRON

48 / 97 page

P30

Datasheet

August 2008

306666-12

Each OTP Register has an associated Lock Register bit. When a Lock Register bit is

programmed, the associated OTP Register can only be read; it can no longer be

programmed. Additionally, because the Lock Register bits themselves are OTP, when

programmed, Lock Register bits cannot be erased. Therefore, when a OTP Register is

locked, it cannot be unlocked.

11.3.1

Reading the OTP registers

The OTP registers can be read from any address. To read the OTP Register, first issue

the Read Device Identifier command at any address to place the device in the Read

Device Identifier state (see Section 6.0, “Command Set” on page 24). Next, perform a

read operation using the address offset corresponding to the register to be read.

Table 13, “Device Identifier Information” on page 28 shows the address offsets of the

OTP Registers and Lock Registers. PR data is read 16 bits at a time.

Figure 16: OTP register map

0x89

Lock Register 1

15 14 13 12 11 10 9

0x102

0x109

0x8A

0x91

128-bit Protection Register 16

(User-Programmable)

128-bit Protection Register 1

(User-Programmable)

0x88

0x85

64-bit Segment

(User-Programmable)

0x84

0x81

0x80

Lock Register 0

64-bit Segment

(Factory-Programmed)

15 14 13 12 11 10 9

128-Bit Protection Register 0

JS28F256P30B95A 데이터시트(PDF) 48 Page - Micron Technology