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參數(shù)資料
| 型號： | W19B322MTB9G |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | PROM |
| 英文描述： | 2M X 16 FLASH 3V PROM, 90 ns, PBGA48 |
| 封裝： | TFBGA-48 |
| 文件頁數(shù)： | 52/52頁 |
| 文件大?。?/td> | 1955K |
| 代理商： | W19B322MTB9G |
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W19B32XMT/B
Publication Release Date: March 23, 2004
- 9 -
Revision A2
using the method described in “Sector/Sector Block Protection and Unprotection.” The two outermost
8 Kbyte boot sectors are the two sectors containing either the lowest addresses in a bottom-boot-
configured device or the highest addresses in a top-boot-configured device.
When the #WP/ACC pin is set at VIH, the device reverts to the two outermost 8K Byte boot sectors
were last set either to be protected or unprotected. That is, sector protection or unprotection for these
two sectors depends on whether they were last protected or unprotected using the method described
in “Sector/Sector Block Protection and Unprotection”.
Please note that the #WP/ACC pin must not be left floating or unconnected; otherwise, the
inconsistent behavior of the device may occur.
6.1.12 Temporary Sector Unprotect
This feature allows temporary unprotection of previously protected sectors to change data in-system.
When the #RESET pin is set to VID (8.5 V - 12.5 V), the Sector Unprotect mode is activated. During
this mode, formerly protected sectors can be programmed or erased by selecting the sector
addresses. What if VID is removed from the #RESET pin, all the previously protected sectors are
protected again.
6.1.13 Security Sector Flash Memory Region
The Security Sector feature provides an OTP memory region that enables permanent device
identification through an Electronic Serial Number (ESN). The Security Sector uses a Security Sector
Indicator Bit (DQ7) to indicate whether the Security Sector is locked or not when shipped from the
factory. The DQ7 is permanently set when it is in the factory and cannot be changed, which prevents
copying of a factory locked part. This ensures the security of the ESN when the product is shipped to
the field. This issue should be considered during system design. Winbond offers the device with the
Security Sector either factory locked or customer lockable. The factory-locked version is always
protected when shipped from the factory, and has the Security Sector Indicator Bit permanently set to
“1.” The customer-lockable version is shipped with the Security Sector unprotected, which allowing
customers to utilize the sector in any ways they choose. The customer-lockable version has the
Security Sector Indicator Bit permanently set to “0.” Thus, the Security Sector Indicator Bit prevents
customer-lockable devices from being used to replace devices that are factory locked.
The system accesses the Security Sector through a command sequence (see “Enter Security
Sector/Exit Security Sector Command Sequence”). After the system has written the Enter Security
Sector command sequence, it may read the Security Sector by using the addresses normally
occupied by the boot sectors. This mode of operation continues until the system issues the Exit
Security Sector command sequence, or until power is removed from the device. On power-up, or
following a hardware reset, the device reverts to sending commands to the boot sectors.
6.1.13.1 Factory Locked: Security Sector Programmed and Protected At the Factory
The device Security Sector is protected when it is shipped from the factory, and it cannot be modified
in any way. The device is available to be preprogrammed by one of the following:
A random, secure ESN only
Customer code through the supplier's service
Both a random, secure ESN and customer code through supplier's service.
In devices with an ESN, the Bottom Boot device will be with the 16-byte ESN in the lowest
addressable memory area at addresses 000000h–000007h in word mode (or 000000h–00000Fh in
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