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参数资料
| 型号： | S29WS064N0PBAW011 |
| 厂商： | Spansion Inc. |
| 英文描述： | 256/128/64 MEGABIT CMOS 1.8 VOLT ONLY SIMULTANEOUS READ/WRITE BURST MODE FLASH MEMORY |
| 中文描述： | 256/128/64兆位的CMOS 1.8伏只有同时读/写突发模式闪存 |
| 文件页数： | 52/99页 |
| 文件大小： | 1091K |
| 代理商： | S29WS064N0PBAW011 |
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54
S29WS-N_00_G0 January 25, 2005
Adva nce
Information
Notes
1.
The DYBs can be set (programmed to “0”) or cleared (erased to “1”) as often as needed.
When the parts are first shipped, the PPBs are cleared (erased to “1”) and upon power up or reset,
the DYBs can be set or cleared depending upon the ordering option chosen.
2.
If the option to clear the DYBs after power up is chosen, (erased to “1”), then the sectors
may be modified depending upon the PPB state of that sector (see Table 8.2).
3.
The sectors would be in the protected state If the option to set the DYBs after power up
is chosen (programmed to “0”).
4.
It is possible to have sectors that are persistently locked with sectors that are left in the
dynamic state.
5.
The DYB Set or Clear commands for the dynamic sectors signify protected or unpro-
tectedstate of the sectors respectively. However, if there is a need to change the status
of the persistently locked sectors, a few more steps are required. First, the PPB Lock Bit
must be cleared by either putting the device through a power-cycle, or hardware reset.
The PPBs can then be changed to reflect the desired settings. Setting the PPB Lock Bit
once again locks the PPBs, and the device operates normally again.
6.
To achieve the best protection, it is recommended to execute the PPB Lock Bit Set com-
mand early in the boot code and protect the boot code by holding WP# = VIL. Note that
the PPB and DYB bits have the same function when ACC = VHH as they do when ACC
=VIH.
8.4
Persistent Protection Bit Lock Bit
The Persistent Protection Bit Lock Bit is a global volatile bit for all sectors. When set (programmed
to “0”), it locks all PPBs and when cleared (programmed to “1”), allows the PPBs to be changed.
There is only one PPB Lock Bit per device.
Notes
1.
No software command sequence unlocks this bit unless the device is in the password
protection mode; only a hardware reset or a power-up clears this bit.
2.
The PPB Lock Bit must be set (programmed to “0”) only after all PPBs are configured to
the desired settings.
8.5
Password Protection Method
The Password Protection Method allows an even higher level of security than the Persistent Sector
Protection Mode by requiring a 64 bit password for unlocking the device PPB Lock Bit. In addition
to this password requirement, after power up and reset, the PPB Lock Bit is set “0” to maintain
the password mode of operation. Successful execution of the Password Unlock command by en-
tering the entire password clears the PPB Lock Bit, allowing for sector PPBs modifications.
Notes
1.
There is no special addressing order required for programming the password. Once the
Password is written and verified, the Password Mode Locking Bit must be set in order to
prevent access.
2.
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 with the cell as a “0”.
3.
The password is all “1”s when shipped from the factory.
4.
All 64-bit password combinations are valid as a password.
5.
There is no means to verify what the password is after it is set.
6.
The Password Mode Lock Bit, once set, prevents reading the 64-bit password on the
data bus and further password programming.
7.
The Password Mode Lock Bit is not erasable.
8.
The lower two address bits (A1–A0) are valid during the Password Read, Password Pro-
gram, and Password Unlock.
9.
The exact password must be entered in order for the unlocking function to occur.
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