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S71GLXXXNC0 데이터시트(HTML) 58 Page - SPANSION

부품명 S71GLXXXNC0
상세내용  Stacked Multi-chip Product (MCP)
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S71GLXXXNC0 데이터시트(HTML) 58 Page - SPANSION

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S29GLxxxN MirrorBitTM Flash Family
S29GLxxxN_MCP_A1 December 15, 2004
Advan ce
In form ati o n
freeze state” after power-up or hardware reset. There is no command sequence
to unlock or “unfreeze” the PPB Lock Bit.
Configuring the PPB Lock Bit to the freeze state requires approximately 100ns.
Reading the PPB Lock Status bit requires the initial access time of the device.
Table 7. Sector Protection Schemes
Table 7 contains all possible combinations of the DYB bit, PPB bit, and PPB Lock
Bit relating to the status of the sector. In summary, if the PPB bit is set, and the
PPB Lock Bit is set, the sector is protected and the protection cannot be removed
until the next power cycle or hardware reset clears the PPB Lock Bit to “unfreeze
state”. If the PPB bit is cleared, the sector can be dynamically locked or unlocked.
The DYB bit then controls whether or not the sector is protected or unprotected.
If the user attempts to program or erase a protected sector, the device ignores
the command and returns to read mode. A program command to a protected sec-
tor enables status polling for approximately 1 µs before the device returns to read
mode without having modified the contents of the protected sector. An erase
command to a protected sector enables status polling for approximately 50 µs
after which the device returns to read mode without having erased the protected
sector. The programming of the DYB bit, PPB bit, and PPB Lock Bit for a given sec-
tor can be verified by writing a DYB Status Read, PPB Status Read, and PPB Lock
Status Read commands to the device.
The Autoselect Sector Protection Verification outputs the OR function of the DYB
bit and PPB bit per sector basis. When the OR function of the DYB bit and PPB bit
is a 1, the sector is either protected by DYB or PPB or both. When the OR function
of the DYB bit and PPB bit is a 0, the sector is unprotected through both the DYB
and PPB.
Persistent Protection Mode Lock Bit
Like the Password Protection Mode Lock Bit, a Persistent Protection Mode Lock Bit
exists to guarantee that the device remain in software sector protection. Once
programmed, the Persistent Protection Mode Lock Bit prevents programming of
the Password Protection Mode Lock Bit. This guarantees that a hacker could not
place the device in Password Protection Mode. The Password Protection Mode
Lock Bit resides in the “Lock Register”.
Protection States
Sector State
DYB Bit
PPB Bit
PPB Lock Bit
Unprotect
Unprotect
Unfreeze
Unprotected – PPB and DYB are changeable
Unprotect
Unprotect
Freeze
Unprotected – PPB not changeable, DYB is
changeable
Unprotect
Protect
Unfreeze
Protected – PPB and DYB are changeable
Unprotect
Protect
Freeze
Protected – PPB not changeable, DYB is changeable
Protect
Unprotect
Unfreeze
Protected – PPB and DYB are changeable
Protect
Unprotect
Freeze
Protected – PPB not changeable, DYB is changeable
Protect
Protect
Unfreeze
Protected – PPB and DYB are changeable
Protect
Protect
Freeze
Protected – PPB not changeable, DYB is changeable


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