at52sc1283j ATMEL Corporation, at52sc1283j Datasheet - Page 12

• Manufacturer Part Number: at52sc1283j
• Description: 128-mbit Flash + 32-mbit/64-mbit Psram Stack Memory
• Manufacturer: ATMEL Corporation

6.14
6.15
6.16
12
Erase Suspend/Erase Resume
Program Suspend/Program Resume
Protection Registers
AT52SC1283J/1284J [Preliminary]
The Erase Suspend command allows the system to interrupt a sector erase or plane erase oper-
ation. The erase suspend command does not work with the Chip Erase feature. Using the erase
suspend command to suspend a sector erase operation, the system can program or read data
from a different sector within the same plane. Since this device is organized into thirty-two
planes, there is no need to use the erase suspend feature while erasing a sector when you want
to read data from a sector in another plane. After the Erase Suspend command is given, the
device requires a maximum time of 15 µs to suspend the erase operation. After the erase opera-
tion has been suspended, the plane that contains the suspended sector enters the erase-
suspend-read mode. The system can then read data or program 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, which does require the plane address. Read, Read Status Register, Product ID
Entry, Clear Status Register, Program, Program Suspend, Erase Resume, Sector Soft-
lock/Hardlock, Sector Unlock are valid commands during an erase suspend.
The Program Suspend command allows the system to interrupt a programming operation and
then read data from a different word within the memory. After the Program Suspend command 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 from any other word
within the device. An address is not required during the program suspend operation. To resume
the programming operation, the system must write the Program Resume command. The pro-
gram suspend and resume are one-bus cycle commands. The command sequence for the
erase suspend and program suspend are the same, and the command sequence for the erase
resume and program resume are the same. Read, Read Status Register, Product ID Entry, Pro-
gram Resume are valid commands during a Program Suspend.
The AT52SC1283J/1284J contains two (PR0 - PR1) registers that can be used for security pur-
poses in system design. Please see
address locations within each protection register. The first protection register (PR0) is divided
into two 64-bit blocks. The two blocks are designated as block A and block B. The data in block
A is non-changeable and is programmed at the factory with a unique number. The data in block
B is programmed by the user and can be locked out such that data in the block cannot be repro-
grammed. The other register (PR1) has 2,048 bits (128 words) that are all user programmable.
To program block B in PR0 or to program PR1 register, a two-bus cycle command must be used
as shown in the Command Definition table on
PR1, a two-bus cycle command must also be used as shown in the Command Definition table.
To lock out block B in PRO, the address used in the second bus cycle is 080h and data bit D1
must be zero during the second bus cycle. All other data bits during the second bus cycle are
don’t cares. To lock out PR1, the address used in the second bus cycle is 089h, and sixteen bits
of data are programmed. If all of these bits are programmed to a zero, the register is locked.
After being locked, the protection register cannot be unlocked. To determine whether block B in
PRO or PR1 is locked out, the Status of Protection PR0 (block B) or PR1 command is given. For
block B in PRO, if data bit D1 is zero, block B is locked. If data bit D1 is one, block B can be
reprogrammed. For PR1, sixteen bits of data are read out. If all sixteen bits are 0s, the register is
locked. To read a protection register, the Product ID Entry command is given followed by a nor-
“Protection Register Addressing Table” on page 20
page
19. To lock out block B in PRO or to lock out
3530B–STKD–2/4/05
for the