JS48F4400P0P3C0 datasheet(98/139 Pages) NUMONYX

98 / 139 page

Numonyx™ StrataFlash® Cellular Memory (M18)

Datasheet

April 2008

309823-10

Each register contains OTP bits that can only be programmed from “one” to “zero” -

registers particularly useful for implementing system-level security schemes, for

permanently storing data, or for storing fixed system parameters.

OTP Lock Register bits “lock out” subsequent programming of the corresponding OTP

zero. As long as an OTP register remains unlocked (that is, its lock bit = 1), any of its

remaining “one” bits can be programmed to “zero”.

Caution:

Once an OTP Register is locked, it cannot be unlocked. Attempts to program a

locked OTP Register will fail with error bits set.

To program any OTP bits, first issue the Program OTP Register setup command at any

device address. Next, write the desired OTP Register data at the desired OTP Register

address. OTP Register and OTP Lock Register programming is performed 16 bits at a

time; only “zeros” within the data word affect any change to the OTP register bits.

Figure 50: 2-Kbit OTP Registers

0x89

OTP Lock Register 1

15 14 13 12 11 10 9

0x102

0x109

0x8A

0x91

128-bit OTP Register 16

(User-Programmable)

128-bit OTP Register 1

(User-Programmable)

0x88

0x85

64-bit Segment

(User-Programmable)

0x84

0x81

0x80

OTP Lock Register 0

64-bit Segment

(Factory-Programmed)

15 14 13 12 11 10 9

128-Bit OTP Register 0

JS48F4400P0P3C0 Datasheet(PDF) 98 Page - Numonyx B.V