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參數(shù)資料
| 型號： | W78M64V100SBC |
| 廠商： | WHITE ELECTRONIC DESIGNS CORP |
| 元件分類： | PROM |
| 英文描述： | 8M X 64 FLASH 3.3V PROM MODULE, 100 ns, PBGA159 |
| 封裝： | 13 X 22 MM, 1.27 MM PITCH, PLASTIC, BGA-159 |
| 文件頁數(shù)： | 25/54頁 |
| 文件大小： | 1348K |
| 代理商： | W78M64V100SBC |
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White Electronic Designs Corporation (602) 437-1520 www.whiteedc.com
White Electronic Designs
W78M64V-XSBX
July 2006
Rev. 4
White Electronic Designs Corp. reserves the right to change products or specications without notice.
command are ignored. Another Erase Suspend command
can be written after the chip has resumed erasing.
PASSWORD PROGRAM COMMAND
The Password Program Command permits programming
the password that is used as part of the hardware protection
scheme. The actual password is 64-bits long. Four Password
Program commands are required to program the password.
The system must enter the unlock cycle, password program
command (38h) and the program address/data for each
portion of the password when programming. There are
no provisions for entering the 2-cycle unlock cycle, the
password program command, and all the password
data. There is no special addressing order required for
programming the password. Also, when the password
is undergoing programming, Simultaneous Operation is
disabled. Read operations to any memory location will
return the programming status. Once programming is
complete, the user must issue a Read/Reset command to
return the device to normal operation. Once the Password
is written and veried, the Password Mode Locking Bit
must be set in order to prevent verication. The Password
Program Command is only capable of programming “0”s.
Programming a “1” after a cell is programmed as a “0” results
in a time-out by the Embedded Program Algorithm with
the cell remaining as a “0”. The password is all ones when
shipped from the factory. All 64-bit password combinations
are valid as a password.
PASSWORD VERIFY COMMAND
The Password Verify Command is used to verify the
Password. The Password is verifiable only when the
Password Mode Locking Bit is not programmed. If the
Password Mode Locking Bit is programmed and the user
attempts to verify the Password, the device will always drive
all F’s onto the DQ data bus.
The Password Verify command is permitted if the SecSi
sector is enabled. Also, the device will not operate in
Simultaneous Operation when the Password Verify
command is executed. Only the password is returned
regardless of the bank address. The lower two address bits
(A1-A0) are valid during the Password Verify. Writing the
Read/Reset command returns the device back to normal
operation.
PASSWORD PROTECTION MODE
LOCKING BIT PROGRAM COMMAND
The Password Protection Mode Locking Bit Program
Command programs the Password Protection Mode
Locking Bit, which prevents further veries or updates to
the Password. Once programmed, the Password Protection
Mode Locking Bit cannot be erased! If the password
Protection Mode Locking Bit is veried as program without
margin, the Password Protection Mode Locking Bit Program
command can be executed to improve the program
margin. Once the Password Protection Mode Locking Bit is
programmed, the Persistent Sector Protection Locking Bit
program circuitry is disabled, thereby forcing the device to
remain in the Password Protection mode. Exiting the Mode
Locking Bit Program command is accomplished by writing
the Read/Reset command.
PERSISTENT SECTOR PROTECTION
MODE LOCKING BIT PROGRAM
COMMAND
The Persistent Sector Protection Mode Locking Bit Program
Command programs the Persistent Sector Protection Mode
Locking Bit, which prevents the Password Mode Locking
Bit from ever being programmed. If the Persistent Sector
Protection Mode Locking Bit is veried as programmed
without margin, the Persistent Sector Protection Mode
Locking Bit Program Command should be reissued to
improve program margin.
By disabling the program circuitry
of the Password Mode Locking Bit, the device is forced to
remain in the Persistent Sector Protection mode of operation,
once this bit is set. Exiting the Persistent Protection Mode
Locking Bit Program command is accomplished by writing
the Read/Reset command.
SecSi SECTOR PROTECTION BIT
PROGRAM COMMAND
The SecSi Sector Protection Bit Program Command
programs the SecSi Sector Protection Bit, which prevents
the SecSi sector memory from being cleared. If the SecSi
Sector Protection Bit is veried as programmed without
margin, the SecSi Sector Protection Bit Program Command
should be reissued to improve program margin.
Exiting the
VCC-level SecSi Sector Protection Bit Program Command is
accomplished by writing the Read/Reset command.
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