at25df161 ATMEL Corporation, at25df161 Datasheet - Page 37

• Manufacturer Part Number: at25df161
• Description: 16-megabit 2.7-volt Minimum Spi Serial Flash Memory
• Manufacturer: ATMEL Corporation

Table 11-2.
Notes:
11.1.1
11.1.2
3687B–DFLASH–11/08
Bit
7
6
5
4
3
2
1
0
(1)
1. Only bits 4 and 3 of Status Register Byte 2 will be modified when using the Write Status Register Byte 2 command.
2. R/W = Readable and writeable
RDY/BSY
SPRL Bit
EPE Bit
RSTE
RES
RES
RES
R = Readable only
SLE
PS
ES
Status Register Format – Byte 2
Reserved for future use
Reserved for future use
Reserved for future use
Reset Enabled
Sector Lockdown Enabled
Program Suspend Status
Erase Suspend Status
Ready/Busy Status
The SPRL bit is used to control whether the Sector Protection Registers can be modified or not.
When the SPRL bit is in the logical “1” state, all Sector Protection Registers are locked and can-
not be modified with the Protect Sector and Unprotect Sector commands (the device will ignore
these commands). In addition, the Global Protect and Global Unprotect features cannot be per-
formed. Any sectors that are presently protected will remain protected, and any sectors that are
presently unprotected will remain unprotected.
When the SPRL bit is in the logical “0” state, all Sector Protection Registers are unlocked and
can be modified (the Protect Sector and Unprotect Sector commands, as well as the Global Pro-
tect and Global Unprotect features, will be processed as normal). The SPRL bit defaults to the
logical “0” state after device power-up. The Reset command has no effect on the SPRL bit.
The SPRL bit can be modified freely whenever the WP pin is deasserted. However, if the WP pin
is asserted, then the SPRL bit may only be changed from a logical “0” (Sector Protection Regis-
ters are unlocked) to a logical “1” (Sector Protection Registers are locked). In order to reset the
SPRL bit back to a logical “0” using the Write Status Register Byte 1 command, the WP pin will
have to first be deasserted.
The SPRL bit is the only bit of Status Register Byte 1 that can be user modified via the Write Sta-
tus Register Byte 1 command.
The EPE bit indicates whether the last erase or program operation completed successfully or
not. If at least one byte during the erase or program operation did not erase or program properly,
then the EPE bit will be set to the logical “1” state. The EPE bit will not be set if an erase or pro-
Name
Type
R/W
R/W
R
R
R
R
R
R
(2)
0
0
0
0
1
0
1
0
1
0
1
0
1
Reserved for future use.
Reserved for future use.
Reserved for future use.
Reset command is disabled (default).
Reset command is enabled.
Sector Lockdown and Freeze Sector Lockdown State
commands are disabled (default).
Sector Lockdown and Freeze Sector Lockdown State
commands are enabled.
No sectors are program suspended (default).
A sector is program suspended.
No sectors are erase suspended (default).
A sector is erase suspended.
Device is ready.
Device is busy with an internal operation.
AT25DF161 [Preliminary]
Description
37