JS28F640P30T85 datasheet(67/99 Pages) NUMONYX

67 / 99 page

November 2007

Datasheet

Order Number: 306666-11

P30

The user-programmable Protection Registers contain one-time programmable (OTP)

bits; when programmed, register bits cannot be erased. Each Protection Register can

be accessed multiple times to program individual bits, as long as the register remains

unlocked.

Each Protection Register has an associated Lock Register bit. When a Lock Register bit

is programmed, the associated Protection 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 Protection

13.3.1

Reading the Protection Registers

The Protection Registers can be read from any address. To read the Protection Register,

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

Read Device Identifier state (see Section 9.2, “Device Commands” on page 45). Next,

perform a read operation using the address offset corresponding to the register to be

read. Table 33, “Device Identifier Information” on page 70 shows the address offsets of

the Protection Registers and Lock Registers. Register data is read 16 bits at a time.

Figure 31: Protection 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

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