qh25f320s33b8 Numonyx, qh25f320s33b8 Datasheet - Page 36

• Manufacturer Part Number: qh25f320s33b8
• Description: Numonyx? Serial Flash Memory S33
• Manufacturer: Numonyx

9.0
9.1
9.1.1
9.1.2
9.1.3
Datasheet
36
Security Features
This section describes the security features of the S33 device that go beyond the
typical SPI Flash feature set.
OTP Memory Space
The S33 device contains two 8-Byte, thirty 16-Byte, and one 10-Byte individually-
lockable OTP regions (Protection Registers) within an address space that is separate
from the main array. Refer to
representation of the OTP memory space.
The two 8-Byte Protection Registers are intended for increased system security.
Protection Register values can “mate” a flash component with system CPU/ASIC to
prevent device substitution. The Numonyx factory programs the lower 8-Byte
Protection Register with a unique, unchangeable 64-bit number. The other 64 bits
(upper 8-Byte) are blank so customers can program them for a similar purpose.
Once programmed, each customer segment (one of the 8-Byte segment, thirty 16-Byte
segments, and one 10-Byte segment) can be locked to prevent further reprogramming.
Programming OTP Address Space
For the description and SPI protocol of the OTP Program command, refer to
“SPI Command Set” on page
Program.
The OTP Program command can be issued multiple times to any given OTP address, but
this address space can never be erased. After a given OTP segment is programmed, it
can be locked to prevent further programming with the Lock Protection Registers,
which are describe in
The valid address range for OTP Program is depicted in
on page
ignored.
Reading OTP Data
For the description and SPI protocol of the OTP Read command, refer to
Command Set” on page
The valid address range for OTP Reads is depicted in
page
indeterminate data.
Lock Protection Registers
The Lock Protection Registers (PR-LOCK1, PR-LOCK2, and PR-LOCK3) are illustrated in
Figure 18, “OTP Memory Map” on page
addresses 0x102 through 0x111; PR-LOCK2 is used to permanently lock OTP addresses
0x114 through 0x213; PR-LOCK3 is used to permanently lock OTP addresses 0x216
through 0x2FF.
37. OTP Read operations outside the valid OTP address range will yield
37. OTP Program operations outside the valid OTP address range will be
Section
25. The protocol of this command is the same as Fast Read.
25. The protocol of this command is the same as Page
9.1.3.
Figure 18, “OTP Memory Map” on page 37
37. PR-LOCK1 is used to permanently lock OTP
Figure 18, “OTP Memory Map” on
Numonyx™ Serial Flash Memory (S33)
Figure 18, “OTP Memory Map”
Order Number: 314822-03
Table 15, “SPI
for a pictorial
December 2007
Table 15,