JS28F640P30T85 datasheet(68/99 Pages) NUMONYX

68 / 99 page

P30

Datasheet

November 2007

Order Number: 306666-11

13.3.2

Programming the Protection Registers

To program any of the Protection Registers, first issue the Program Protection Register

command at the parameter’s base address plus the offset to the desired Protection

Protection Register data to the same Protection Register address (see Figure 31,

“Protection Register Map” on page 67).

The device programs the 64-bit and 128-bit user-programmable Protection Register

data 16 bits at a time (see Figure 45, “Protection Register Programming Flowchart” on

page 86). Issuing the Program Protection Register command outside of the Protection

locked Protection Register causes a program error (SR[4] set) and a lock error (SR[1]

set).

Note:

When programming the OTP bits 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.

13.3.3

Locking the Protection Registers

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

Lock Register. To lock a Protection Register, program the corresponding bit in the Lock

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 33, “Device

Identifier Information” on page 70).

Bit 0 of Lock Register 0 is already programmed at the factory, locking the lower, pre-

programmed 64-bit region of the first 128-bit Protection Register containing the unique

identification number of the device. Bit 1 of Lock Register 0 can be programmed by the

user to lock the user-programmable, 64-bit region of the first 128-bit Protection

such that the data programmed is 0xFFFD.

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

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

Protection Registers. Programming a bit in Lock Register 1 locks the corresponding

128-bit Protection Register.

Caution:

After being locked, the Protection Registers cannot be unlocked.

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