s29jl032j Meet Spansion Inc., s29jl032j Datasheet - Page 33

• Manufacturer Part Number: s29jl032j
• Description: 32megabit 4m X 8-bit/2m X 16-bit Cmos 3.0volt-only, Simultaneous Read/write Flash Memory
• Manufacturer: Meet Spansion Inc.

January 27, 2010 S29JL032J_00_01
10.5.1
Unlock Bypass Command Sequence
The unlock bypass feature allows the system to program bytes or words to a bank faster than using the
standard program command sequence. The unlock bypass command sequence is initiated by first writing two
unlock cycles. This is followed by a third write cycle containing the unlock bypass command, 20h. That bank
then enters the unlock bypass mode. A two-cycle unlock bypass program command sequence is all that is
required to program in this mode. The first cycle in this sequence contains the unlock bypass program
command, A0h; the second cycle contains the program address and data. Additional data is programmed in
the same manner. This mode dispenses with the initial two unlock cycles required in the standard program
command sequence, resulting in faster total programming time.
requirements for the command sequence.
During the unlock bypass mode, only the Unlock Bypass Program and Unlock Bypass Reset commands are
valid. To exit the unlock bypass mode, the system must issue the two-cycle unlock bypass reset command
sequence.
The device offers accelerated program operations through the WP#/ACC pin. When the system asserts V
on the WP#/ACC pin, the device automatically enters the Unlock Bypass mode. The system may then write
the two-cycle Unlock Bypass program command sequence. The device uses the higher voltage on the WP#/
ACC pin to accelerate the operation. Note that the WP#/ACC pin must not be at V
than accelerated programming, or device damage may result. In addition, the WP#/ACC pin must not be left
floating or unconnected; inconsistent behavior of the device may result.
Figure 10.1
on page 50
Note
See
Table 10.1 on page 37
D a t a
(Table 10.1 on page
for parameters, and
illustrates the algorithm for the program operation. Refer to
S h e e t
for program command sequence.
( A d v a n c e
Increment Address
37).
Figure 17.5 on page 51
Figure 10.1 Program Operation
S29JL032J
Embedded
in progress
algorithm
Program
I n f o r m a t i o n )
No
for timing diagrams.
Command Sequence
Write Program
Last Address?
Programming
from System
Verify Data?
Completed
Data Poll
START
Table 10.1 on page 37
Yes
Yes
Erase and Program Operations
No
HH
for any operation other
shows the
HH
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