JS28F256P30B95A datasheet(49/97 Pages) MICRON

49 / 97 page

August 2008

Datasheet

Order Number: 306666-12

P30

11.3.2

Programming the OTP Registers

To program any of the OTP Registers, first issue the Program OTP Register command at

the parameter’s base address plus the offset to the desired OTP Register (see Section

6.0, “Command Set” on page 24). Next, write the desired OTP Register data to the

same OTP Register address (see Figure 16, “OTP register map” on page 48).

The device programs the 64-bit and 128-bit user-programmable OTP Register data 16

bits at a time (see Figure 41, “Protection Register Programming Flowchart” on

page 87). Issuing the Program OTP Register command outside of the OTP Register’s

address space causes a program error (SR[4] set). Attempting to program a locked

OTP Register causes a program error (SR[4] set) and a lock error (SR[1] set).

Note:

When programming the OTP bits in the OTP registers for a Top Parameter Device,

the following upper address bits must also be driven properly: A[Max:17] driven high

(VIH) for TSOP and Easy BGA packages, and A[Max:16] driven high (VIH) for QUAD+

SCSP.

11.3.3

Locking the OTP Registers

Each OTP Register can be locked by programming its respective lock bit in the Lock

issuing the Program Lock Register command, followed by the desired Lock Register

data (see Section 6.0, “Command Set” on page 24). The physical addresses of the Lock

Registers are 0x80 for register 0 and 0x89 for register 1. These addresses are used

when programming the lock registers (see Table 13, “Device Identifier Information” on

page 28).

Bit 0 of Lock Register 0 is already programmed during the manufacturing process at the

“factory”, locking the lower, pre-programmed 64-bit region of the first 128-bit OTP

region of the first 128-bit OTP Register. When programming Bit 1 of Lock Register 0, all

other bits need to be left as ‘1’ such that the data programmed is 0xFFFD.

Lock Register 1 controls the locking of the upper sixteen 128-bit OTP Registers. Each of

the 16 bits of Lock Register 1 correspond to each of the upper sixteen 128-bit OTP

Registers. Programming a bit in Lock Register 1 locks the corresponding 128-bit OTP

Caution:

After being locked, the OTP Registers cannot be unlocked.

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