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参数资料
| 型号： | W28J800BT90L |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | PROM |
| 英文描述： | 512K X 16 FLASH 2.7V PROM, 90 ns, PDSO48 |
| 封装： | 12 X 20 MM, TSOP-48 |
| 文件页数： | 4/49页 |
| 文件大小： | 1527K |
| 代理商： | W28J800BT90L |
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W28J800B/T
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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/BYTE 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
[A18-A0]
[A18-A1]
00FFF
00085
00084
00081
00080
01FFF
0010A
00109
00102
00100
Customer Program Area Lock(Bit 1)
Factory Program Area Lock(Bit 1)
Figure 5. OTP Block Address Map
Write
Writing commands to the CUI enable reading of device data and identifier codes. They also control
inspection and clearing of the status register. When VDD = 2.7V to 3.6V and VPP = VPPH1/2, the CUI
additionally controls block erase, full chip erase, word/byte write and lock-bit configuration.
The Block Erase command requires appropriate command data and an address within the block to be
erased. The Full Chip Erase command requires appropriate command data and an address within the
device. The Word/Byte Write command requires the command and address of the location to be
written. Set Permanent and Block Lock-Bit commands require the command and address within the
device (Permanent Lock) or block within the device (Block Lock) to be locked. The Clear Block Lock-
Bits command requires the command and address within the device.
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