AT25DF321A-SH-T Atmel, AT25DF321A-SH-T Datasheet - Page 31

• Manufacturer Part Number: AT25DF321A-SH-T
• Description: IC FLASH 32MBIT 100MHZ 8SOIC
• Manufacturer: Atmel

Specifications of AT25DF321A-SH-T

• Format - Memory: FLASH
• Memory Type: DataFLASH
• Memory Size: 32M (16384 pages x 256 Bytes)
• Speed: 100MHz
• Interface: SPI, RapidS
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
• Density: 32Mb
• Access Time (max): 5ns
• Interface Type: Serial (SPI)
• Address Bus: 1b
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: -40C to 85C
• Package Type: SOIC
• Program/erase Volt (typ): 2.7 to 3.6V
• Sync/async: Synchronous
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Word Size: 8b
• Number Of Words: 4M
• Supply Current: 19mA
• Mounting: Surface Mount
• Pin Count: 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3686D–DFLASH–12/09
11.1.1 SPRL Bit
11.1.2 EPE Bit
Table 11-2.
Notes:
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 cannot 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 performed. 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 Protect 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 Registers 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 Status 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 program operation aborts for any reason such as an attempt to erase or program a
protected region or a locked down sector, an attempt to erase or program a suspended sector, or if the WEL bit is not set
prior to an erase or program operation. The EPE bit will be updated after every erase and program operation.
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
RSTE
R = Readable only
RES
RES
RES
SLE
Status Register Format – Byte 2
PS
ES
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
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
Description
Atmel AT25DF321A
31