参数资料
型号: RC28F256P33T85A
厂商: NUMONYX
元件分类: PROM
英文描述: 16M X 16 FLASH 3V PROM, 85 ns, PBGA64
封装: BGA-64
文件页数: 64/96页
文件大小: 1378K
代理商: RC28F256P33T85A
November 2007
Datasheet
Order Number: 314749-05
67
Numonyx StrataFlash Embedded Memory (P33)
The first 128-bit Protection Register is comprised of two 64-bit (8-word) segments. The
lower 64-bit segment is pre-programmed at the Numonyx factory with a unique 64-bit
number. The other 64-bit segment, as well as the other sixteen 128-bit Protection
Registers, are blank. Users can program these registers as needed. When programmed,
users can then lock the Protection Register(s) to prevent additional bit programming
The user-programmable Protection Registers contain one-time programmable (OTP)
bits; when programmed, PR bits cannot be erased. Each Protection Register can be
accessed multiple times to program individual bits, as long as the register remains
unlocked.
Each Protection Register has an associated Lock Register bit. When a Lock Register bit
is programmed, the associated Protection Register can only be read; it can no longer be
programmed. Additionally, because the Lock Register bits themselves are OTP, when
programmed, Lock Register bits cannot be erased. Therefore, when a Protection
Register is locked, it cannot be unlocked.
.
11.4.8.1
Reading the Protection Registers
The Protection Registers can be read from any address. To read the Protection Register,
first issue the Read Device Identifier command at any address to place the device in the
Read Device Identifier state (see Section 9.6, “Device Command Bus Cycles” on
Figure 32: Protection Register Map
0x89
Lock Register 1
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
0x102
0x109
0x8A
0x91
128-bit Protection Register 16
(User-Programmable)
128-bit Protection Register 1
(User-Programmable)
0x88
0x85
64-bit Segment
(User-Programmable)
0x84
0x81
0x80
Lock Register 0
64-bit Segment
(Factory-Programmed)
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
128-Bit Protection Register 0
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