28F640L30, 28F128L30, 28F256L30
7.2.2
Programming the Protection Registers
To program any of the Protection Registers, first issue the Program Protection Register command
at the parameter partition’s base address plus the offset to the desired Protection Register (see
Section 3.2, “Device Commands” on page 18). Next, write the desired Protection Register data to
the same Protection Register address (see Figure 9, “Protection Register Map” on page 41).
The device programs the 64-bit and 128-bit user-programmable Protection Register data 16 bits at
a time (see Figure 37, “Protection Register Programming Flowchart” on page 81). Issuing the
Program Protection Register command outside of the Protection Register’s address space causes a
program error (SR[4] set). Attempting to program a locked Protection Register causes a program
error (SR[4] set) and a lock error (SR[1] set).
Note: If a program or erase operation occurs when programming a Protection Register, certain
restrictions may apply. See Table 12, “Simultaneous Operation Restrictions” on page 46 for details.
7.2.3
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 Register by
issuing the Program Lock Register command, followed by the desired Lock Register data (see
Section 3.2, “Device Commands” on page 18). 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 14, “Device Identifier Information” on page 49).
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 Register. The other bits in Lock Register 0 are not used.
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.
42
Datasheet
INTEL [ INTEL ]
