S29PL-J SPANSION [SPANSION], S29PL-J Datasheet - Page 58

• Manufacturer Part Number: S29PL-J
• Description: CMOS 3.0 Volt-only, Simultaneous-Read/Write Flash Memory with Enhanced VersatileIO Control
• Manufacturer: SPANSION [SPANSION]

15.2
15.3
15.4
56
Reset Command
Autoselect Command Sequence
Enter/Exit Secured Silicon Sector Command Sequence
Writing the reset command resets the banks to the read or erase-suspend-read mode. Address bits are don’t
cares for this command.
The reset command may be written between the sequence cycles in an erase command sequence before
erasing begins. This resets the bank to which the system was writing to the read mode. Once erasure begins,
however, the device ignores reset commands until the operation is complete.
The reset command may be written between the sequence cycles in a program command sequence before
programming begins. This resets the bank to which the system was writing to the read mode. If the program
command sequence is written to a bank that is in the Erase Suspend mode, writing the reset command
returns that bank to the erase-suspend-read mode. Once programming begins, however, the device ignores
reset commands until the operation is complete.
The reset command may be written between the sequence cycles in an autoselect command sequence.
Once in the autoselect mode, the reset command must be written to return to the read mode. If a bank
entered the autoselect mode while in the Erase Suspend mode, writing the reset command returns that bank
to the erase-suspend-read mode.
If DQ5 goes high during a program or erase operation, writing the reset command returns the banks to the
read mode (or erase-suspend-read mode if that bank was in Erase Suspend and program-suspend-read
mode if that bank was in Program Suspend).
The autoselect command sequence allows the host system to access the manufacturer and device codes,
and determine whether or not a sector is protected. The autoselect command sequence may be written to an
address within a bank that is either in the read or erase-suspend-read mode. The autoselect command may
not be written while the device is actively programming or erasing in the other bank.
The autoselect command sequence is initiated by first writing two unlock cycles. This is followed by a third
write cycle that contains the bank address and the autoselect command. The bank then enters the autoselect
mode. The system may read any number of autoselect codes without reinitiating the command sequence.
Table 15.1 on page 62
information, the system must write to the appropriate bank address (BA) and sector address (SA).
on page 21
The system must write the reset command to return to the read mode (or erase-suspend-read mode if the
bank was previously in Erase Suspend).
The Secured Silicon Sector region provides a secured data area containing a random, eight word electronic
serial number (ESN). The system can access the Secured Silicon Sector region by issuing the three-cycle
Enter Secured Silicon Sector command sequence. The device continues to access the Secured Silicon
Sector region until the system issues the four-cycle Exit Secured Silicon Sector command sequence. The Exit
Secured Silicon Sector command sequence returns the device to normal operation. The Secured Silicon
Sector is not accessible when the device is executing an Embedded Program or embedded Erase algorithm.
Table 15.1 on page 62
Secured Silicon Sector Flash Memory Region on page 50
and unlock bypass modes are not available when the Secured Silicon Sector is enabled.
shows the address range and bank number associated with each sector.
shows the address and data requirements. To determine sector protection
shows the address and data requirements for both command sequences. See also
D a t a
S h e e t
S29PL-J
( A d v a n c e
for further information. Note that the ACC function
I n f o r m a t i o n )
S29PL-J_00_A9 September 22, 2006
Table 10.4