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S71WS512NC0BFWE73 데이터시트(HTML) 61 Page - SPANSION

부품명 S71WS512NC0BFWE73
상세내용  Stacked Multi-Chip Product (MCP)
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S71WS512NC0BFWE73 데이터시트(HTML) 61 Page - SPANSION

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September 15, 2005 S71WS-N_01_A4
S71WS-Nx0 Based MCPs
59
Advance
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 11.2).
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 unprotected
state of the sectors respectively. However, if there is a need to change the status of the per-
sistently 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 command
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.
11.4
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 pro-
tection 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.
11.5
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.


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