s71ws256nc0bawa30 Meet Spansion Inc., s71ws256nc0bawa30 Datasheet - Page 58

• Manufacturer Part Number: s71ws256nc0bawa30
• Description: Stacked Multi-chip Product Mcp 256/512/128 Megabit 32m/16m/8m X 16 Bit Cmos 1.8 Volt-only Simultaneous Read/write, Burst-mode Flash Memory With 128/64megabit 8m/4m X 16-bit Psram.
• Manufacturer: Meet Spansion Inc.

11.1
11.2
56
Lock Register
Persistent Protection Bits
As shipped from the factory, all devices default to the persistent mode when power is applied, and
all sectors are unprotected, unless otherwise chosen through the DYB ordering option. The device
programmer or host system must then choose which sector protection method to use. Program-
ming (setting to “0”) any one of the following two one-time programmable, non-volatile bits locks
the part permanently in that mode:
For programming lock register bits refer to
Notes
1. If the password mode is chosen, the password must be programmed before setting the cor-
2. After the Lock Register Bits Command Set Entry command sequence is written, reads and
3. If both lock bits are selected to be programmed (to zeros) at the same time, the operation
4. Once the Password Mode Lock Bit is programmed, the Persistent Mode Lock Bit is permanently
After selecting a sector protection method, each sector can operate in any of the following three
states:
1.
2.
3. Unlocked. The sectors are unprotected and can be erased and/or programmed.
These states are controlled by the bit types described in Sections 11.2–.
The Persistent Protection Bits are unique and nonvolatile for each sector and have the same en-
durances as the Flash memory. Preprogramming and verification prior to erasure are handled by
the device, and therefore do not require system monitoring.
S29WS256N
S29WS128N
Lock Register Persistent Protection Mode Lock Bit (DQ1)
Lock Register Password Protection Mode Lock Bit (DQ2)
responding lock register bit.
writes for Bank 0 are disabled, while reads from other banks are allowed until exiting this
mode.
aborts.
disabled, and no changes to the protection scheme are allowed. Similarly, if the Persistent
Mode Lock Bit is programmed, the Password Mode is permanently disabled.
Device
Constantly locked. The selected sectors are protected and can not be reprogrammed unless
PPB lock bit is cleared via a password, hardware reset, or power cycle.
Dynamically locked. The selected sectors are protected and can be altered via software
commands.
Undefined
DQ15-05
1
DYB Lock Boot Bit
unprotected
0 = sectors
1 = sectors
protected
power up
power up
Table 11.1 Lock Register
A d v a n c e
DQ4
S71WS-Nx0 Based MCPs
1
command disabled
command enabled
Programmable Bit
0 = All PPB erase
1 = All PPB Erase
PPB One-Time
Table
I n f o r m a t i o n
DQ3
1
15.2.
Mode Lock Bit
Mode Lock Bit
Protection
Protection
Password
Password
DQ2
Mode Lock Bit
Mode Lock Bit
Protection
Protection
Persistent
Persistent
S71WS-N_01_A4 September 15, 2005
DQ1
Protection Bit
Protection Bit
SecSi Sector
SecSi Sector
Customer
DQ0