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参数资料
| 型号： | W28J321BB90L |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | PROM |
| 英文描述： | 2M X 16 FLASH 2.7V PROM, 90 ns, PBGA48 |
| 封装： | 8 X 11 MM, 0.75 MM PITCH, TFBGA-48 |
| 文件页数： | 5/47页 |
| 文件大小： | 1385K |
| 代理商： | W28J321BB90L |
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W28J321B/T
Publication Release Date: April 11, 2003
- 13 -
Revision A4
OTP(One Time Program) Block
The OTP block is a special block that can not be erased. The block is divided into two parts. One is a
factory program area where a unique number can be written according to customer requirements in
Winbond factory. This factory program area is "READ ONLY" (Already locked). The other is a
customer program area that can be used by customers. This customer program area can be locked.
After locking, this customer program area is protected permanently.
The OTP block is read in Configuration Read Mode by writing Read Identifier Codes command(90H).
To return to Read Array Mode, write Read Array command(FFH).
The OTP block is programmed by writing OTP Program command(C0H). First write OTP Program
command and then write data with address to the device (See Figure 5).
If OTP program is failed, SR.4(WORD WRITE AND SET LOCK-BIT STATUS) bit is set to "1". And if
this OTP block is locked, SR.1(DEVICE PROTECT STATUS) bit is set to "1" too.
The OTP block is also locked by writing OTP Program command(C0H). First write OTP Program
command and then write data "FFFDH" with address "80H" to the device. Address "80H" of OTP block
is OTP lock information. Bit 0 of address "80H" means factory program area lock status("1" is "NOT
LOCKED", "0" is "LOCKED"). Bit 1 of address "80H" means customer program area lock status. The
OTP lock information can not be cleared, after once it is set.
Customer Program Area
Factory Program Area
OTP Lock
[A20-A0]
00FFF
00085
00084
00081
00080
Customer Program Area Lock
Factory Program Area Lock
Figure 5. OTP Block Address Map
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