AT49BV163A-70TU Atmel, AT49BV163A-70TU Datasheet - Page 7

• Manufacturer Part Number: AT49BV163A-70TU
• Description: IC FLASH 16MBIT 70NS 48TSOP
• Manufacturer: Atmel

Specifications of AT49BV163A-70TU

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 16M (2M x 8 or 1M x 16)
• Speed: 70ns
• Interface: Parallel
• Voltage - Supply: 2.65 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-TSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.7.3
4.7.4
4.8
4.8.1
4.8.2
3349H–FLASH–3/05
Sector Lockdown
Erase/Program Status Bit
V
Sector Lockdown Detection
Sector Lockdown Override
PP
Status Bit
The device offers a status bit on I/O5, which indicates whether the program or erase operation
has exceeded a specified internal pulse count limit. If the status bit is a “1”, the device is unable
to verify that an erase or a byte/word program operation has been successfully performed. If a
program (Sector Erase) command is issued to a protected sector, the protected sector will not
be programmed (erased). The device will go to a status read mode and the I/O5 status bit will be
set high, indicating the program (erase) operation did not complete as requested. Once the
erase/program status bit has been set to a “1”, the system must write the Product ID Exit com-
mand to return to the read mode. The erase/program status bit is a “0” while the erase or
program operation is still in progress. Please see
The AT49BV162A(T) provides a status bit on I/O3, which provides information regarding the
voltage level of the VPP pin. During a program or erase operation, if the voltage on the VPP pin
is not high enough to perform the desired operation successfully, the I/O3 status bit will be a “1”.
Once the V
mand to return to the read mode. On the other hand, if the voltage level is high enough to
perform a program or erase operation successfully, the V
see
Each sector has a programming lockdown feature. This feature prevents programming of data in
the designated sectors once the feature has been enabled. These sectors can contain secure
code that is used to bring up the system. Enabling the lockdown feature will allow the boot code
to stay in the device while data in the rest of the device is updated. This feature does not have to
be activated; any sector’s usage as a write-protected region is optional to the user.
At power-up or reset, all sectors are unlocked. To activate the lockdown for a specific sector, the
six-bus cycle Sector Lockdown command must be issued. Once a sector has been locked down,
the contents of the sector is read-only and cannot be erased or programmed.
A software method is available to determine if programming of a sector is locked down. When
the device is in the software product identification mode (see “Software Product Identification
Entry/Exit” sections on
if programming the sector is locked down. If the data on I/O0 is low, the sector can be pro-
grammed; if the data on I/O0 is high, the program lockdown feature has been enabled and the
sector cannot be programmed. The software product identification exit code should be used to
return to standard operation.
The only way to unlock a sector that is locked down is through reset or power-up cycles. After
power-up or reset, the content of a sector that is locked down can be erased and reprogrammed.
“Status Bit Table” on page 12
PP
status bit has been set to a “1”, the system must write the Product ID Exit com-
page
23), a read from address location 00002H within a sector will show
for more details.
“Status Bit Table” on page 12
AT49BV162/163A(T)
PP
status bit will output a “0”. Please
for more details.
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