W28F641B Datasheet, PDF (11/31 Pages) Winbond – 64MBIT (4MBIT × 16) PAGE MODE DUAL WORK FLASH MEMORY

W28F641B/T
7. Following the third bus cycle, inputs the program sequential address and write data of "N" times. Finally, input the any valid
address within the target block to be programmed and the confirm command (D0H). Refer to Appendix for details.
8. If the program operation in one partition is suspended and the erase operation in other partition is also suspended, the
suspended program operation should be resumed first, and then the suspended erase operation should be resumed next.
9. Full chip erase and OTP program operations can not be suspended. The OTP Program command can not be accepted while
the block erase operation is being suspended.
10. Following the Clear Block Lock Bit command, block which is not locked-down is unlocked when #WP is VIL. When #WP is
VIH, lock-down bit is disabled and the selected block is unlocked regardless of lock-down configuration.
11. Commands other than those shown above are reserved by Winbond for future device implementations and should not be
used.
Table 7. Functions of Block Lock⁽⁵⁾ and Block Lock-Down
State
#WP
CURRENT STATE
DQ1⁽¹⁾ DQ0⁽¹⁾
State Name
ERASE/PROGRAM
ALLOWED⁽²⁾
[000]
0
0
0
Unlocked
Yes
[001]⁽³⁾
0
0
1
Locked
No
[011]
0
1
1
Locked-down
No
[100]
1
0
0
Unlocked
Yes
[101]⁽³⁾
1
0
1
Locked
No
[110]⁽⁴⁾
1
1
0
Lock-down Disable
Yes
[111]
1
1
1
Lock-down Disable
No
Notes:
1. DQ0 = 1: a block is locked; DQ0 = 0: a block is unlocked.
DQ1 = 1: a block is locked-down; DQ1 = 0: a block is not locked-down.
2. Erase and program are general terms, respectively, to express: block erase, full chip erase and (page buffer) program
operations.
3. At power-up or device reset, all blocks default to locked state and are not locked-down, that is, [001] (#WP = 0) or [101] (#WP
= 1), regardless of the states before power-off or reset operation.
4. When #WP is driven to VIL in [110] state, the state changes to [011] and the blocks are automatically locked.
5. OTP (One Time Program) block has the lock function, which is different from those described above.
Table 8. Block Locking State Transitions upon Command Write⁽⁴⁾
CURRENT STATE
State
#WP DQ1
[000]
0
0
[001]
0
0
DQ0
0
1
RESULT AFTER LOCK COMMAND WRITTEN (NEXT STATE)
Set Lock⁽¹⁾
Clear Lock⁽¹⁾
Set Lock-down⁽¹⁾
[001]
No Change
[011]⁽²⁾
No Change⁽³⁾
[000]
[011]
[011]
[100]
0
1
1
1
0
0
No Change
[101]
No Change
No Change
No Change
[111]⁽²⁾
[101]
[110]
1
0
1
1
1
0
No Change
[111]
[100]
No Change
[111]
[111]⁽²⁾
[111]
1
1
1
No Change
[110]
No Change
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Publication Release Date: March 27, 2003
Revision A3