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参数资料
| 型号： | S29CD032G0RFFN003 |
| 厂商： | SPANSION LLC |
| 元件分类： | PROM |
| 英文描述： | 1M X 32 FLASH 2.7V PROM, 48 ns, PBGA80 |
| 封装： | 13 X 11 MM, 1 MM PITCH, LEAD FREE, FORTIFIED, BGA-80 |
| 文件页数： | 46/81页 |
| 文件大小： | 1276K |
| 代理商： | S29CD032G0RFFN003 |
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48
S29CD-G Flash Family
S29CD-G_00_B1 March 3, 2009
Data
Sheet
(Pre limin ar y)
To terminate the CFI operation, it is necessary to execute the Read/Reset command.
The CFI command is not permitted if the Secured Silicon sector is enabled and Simultaneous Read/Write
operation is disabled once the command is entered.
See Common Flash Interface (CFI) Command on page 47 for the specific CFI command codes.
15.16 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. Depending upon the state of the WORD# pin,
multiple Password Program Commands are required. For a x32 bit data bus, 2 Password Program
commands are required. The user 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 Read/Write operation is disabled. Read operations to any memory location
returns 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 verified, the Password
Mode Locking Bit must be set in order to prevent verification. The Password Program Command is only
capable of programming 0s. 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 F’s when shipped from
the factory. All 64-bit password combinations are valid as a password.
Password Programming is permitted if the Secured Silicon sector is enabled.
15.17 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 always drives all F’s onto the DQ data bus.
The Password Verify command is permitted if the Secured Silicon sector is enabled. Also, Simultaneous
Read/Write operation is disabled when the Password Verify command is executed. Only the password is
returned regardless of the bank address. The lower two address bits (A0:A-1) are valid during the Password
Verify. Writing the Read/Reset command returns the device back to normal operation.
15.18 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 verifies or updates to the Password. Once programmed, the Password
Protection Mode Locking Bit cannot be erased! If the Password Protection Mode Locking Bit is verified 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.
The Password Protection Mode Locking Bit Program command is permitted if the Secured Silicon sector is
enabled.
15.19 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 verified 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.
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