at49bv163d ATMEL Corporation, at49bv163d Datasheet - Page 6

• Manufacturer Part Number: at49bv163d
• Description: 16-megabit 1m X 16/2m X 8 3-volt Only Flash Memory
• Manufacturer: ATMEL Corporation

4.7.1
4.7.2
4.8
4.9
4.10
6
Erase Suspend/Erase Resume
Program Suspend/Program Resume
Product Identification
AT49BV163D(T)
Sector Lockdown Detection
Sector Lockdown Override
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.
The Erase Suspend command allows the system to interrupt a sector or chip erase operation
and then program or read data from a different sector within the memory. After the Erase Sus-
pend command is given, the device requires a maximum time of 15 µs to suspend the erase
operation. After the erase operation has been suspended, the system can then read data or pro-
gram data to any other sector within the device. An address is not required during the Erase
Suspend command. During a sector erase suspend, another sector cannot be erased. To
resume the sector erase operation, the system must write the Erase Resume command. The
Erase Resume command is a one-bus cycle command. The device also supports an erase sus-
pend during a complete chip erase. While the chip erase is suspended, the user can read from
any sector within the memory that is protected. The command sequence for a chip erase sus-
pend and a sector erase suspend are the same.
The Program Suspend command allows the system to interrupt a programming operation and
then read data from a different byte/word within the memory. After the Program Suspend com-
mand is given, the device requires a maximum of 10 µs to suspend the programming operation.
After the programming operation has been suspended, the system can then read data from any
other byte/word that is not contained in the sector in which the programming operation was sus-
pended. An address is not required during the program suspend operation. To resume the
programming operation, the system must write the Program Resume command. The program
suspend and resume are one-bus cycle commands. The command sequence for the erase sus-
pend and program suspend are the same, and the command sequence for the erase resume
and program resume are the same.
The product identification mode identifies the device and manufacturer as Atmel. It is accessed
using a software operation.
For details, see
sections on
page
“Operating Modes” on page 15
21.
page
21), a read from address location 00002H within a sector will show
or “Software Product Identification Entry/Exit”
3590A–FLASH–12/05