ESMT
F25L16PA
WRITE ENABLE LATCH (WEL)
BUSY
The Write-Enable-Latch bit indicates the status of the internal
memory Write Enable Latch. If this bit is set to “1”, it indicates the
device is Write enabled. If the bit is set to “0” (reset), it indicates
the device is not Write enabled and does not accept any memory
Write (Program/ Erase) commands. This bit is automatically reset
under the following conditions:
The BUSY bit determines whether there is an internal Erase or
Program operation in progress. A “1” for the BUSY bit indicates
the device is busy with an operation in progress. A “0” indicates
the device is ready for the next valid operation.
• Power-up
• Write Disable (WRDI) instruction completion
• Page Program instruction completion
• Auto Address Increment (AAI) Programming is completed and
reached its highest unprotected memory address
• Sector Erase instruction completion
• Block Erase instruction completion
• Chip Erase instruction completion
Auto Address Increment (AAI)
The Auto-Address-Increment-Programming-Status bit provides
status on whether the device is in AAI Programming mode or
Page Program mode. The default at power up is Page Program
mode.
• Write Status Register instructions
Table 3: F25L16PA Block Protection Table
Protection Level
Status Register Bit
Protected Memory Area
BP2
BP1
0
BP0
Block Range
Address Range
None
0
0
0
0
0
1
1
1
1
0
1
0
1
0
1
0
1
None
Upper 1/32
Upper 1/16
Upper 1/8
Upper 1/4
Upper 1/2
All Blocks
All Blocks
0
Block 31
1F0000H – 1FFFFFH
1E0000H – 1FFFFFH
1C0000H – 1FFFFFH
180000H – 1FFFFFH
100000H – 1FFFFFH
000000H – 1FFFFFH
000000H – 1FFFFFH
1
Block 30~31
Block 28~31
Block 24~31
Block 16~31
Block 0~31
Block 0~31
1
0
0
1
1
Block Protection (BP2, BP1, BP0)
Block Protection Lock-Down (BPL)
The Block-Protection (BP2, BP1, BP0) bits define the size of the
memory area, as defined in Table 3, to be software protected
against any memory Write (Program or Erase) operations. The
Write Status Register (WRSR) instruction is used to program the
WP pin driven low (VIL), enables the Block-Protection-
Lock-Down (BPL) bit. When BPL is set to 1, it prevents any
further alteration of the BPL, BP2, BP1, and BP0 bits. When the
WP pin is driven high (VIH), the BPL bit has no effect and its
value is “Don’t Care”. After power-up, the BPL bit is reset to 0.
BP2, BP1, BP0 bits as long as WP is high or the Block-
Protection-Look (BPL) bit is 0. Chip Erase can only be executed if
Block-Protection bits are all 0. After power-up, BP2, BP1 and BP0
are set to1.
Elite Semiconductor Memory Technology Inc.
Publication Date: Jul. 2009
Revision: 1.4
7/33
ESMT [ ELITE SEMICONDUCTOR MEMORY TECHNOLOGY INC. ]
