s29gl01gs Meet Spansion Inc., s29gl01gs Datasheet - Page 26

• Manufacturer Part Number: s29gl01gs
• Manufacturer: Meet Spansion Inc.

5.3
26
5.3.1
5.3.1.1
5.3.1.2
Command Set
Program Methods
Word Programming
Word programming is used to program a single word anywhere in the main Flash Memory Array.
The Word Programming command is a four-write-cycle sequence. The program command sequence is
initiated by writing two unlock write cycles, followed by the program set up command. The program address
and data are written next, which in turn initiate the Embedded Word Program algorithm. The system is not
required to provide further controls or timing. The device automatically generates the program pulses and
verifies the programmed cell margin internally. When the Embedded Word Program algorithm is complete,
the EAC then returns to its standby mode.
The system can determine the status of the program operation by using Data Polling Status, reading the
Status Register, or monitoring the RY/BY# output. See
status bits. See
on page 26
Any commands other than Program Suspend written to the device during the Embedded Program algorithm
are ignored. Note that a hardware reset (RESET# = V
returns to read mode after t
reinitiated once the device has completed the hardware reset operation.
The Word Programming command may also be used when the SSR ASO is entered.
A modified version of the Word Programming command, without unlock write cycles, is used for programming
when entered into the Lock Register, Password, and PPB ASOs. The same command is used to change
volatile bits when entered in to the PPB Lock, and DYB ASOs. See
command sequences.
Write Buffer Programming
A write buffer is used to program data within a 512-byte address range aligned on a 512-byte boundary
(Line). Thus, a full Write Buffer Programming operation must be aligned on a Line boundary. Programming
operations of less than a full 512 bytes may start on any word boundary but may not cross a Line boundary.
At the start of a Write Buffer programming operation all bit locations in the buffer are all 1’s (FFFFh words)
thus any locations not loaded will retain the existing data. See
address map.
for a diagram of the programming operation.
Data Polling Status on page 37
Embedded
in progress
algorithm
Program
RPH
D a t a
time. To ensure data integrity, the Program command sequence should be
GL-S MirrorBit
Figure 5.1 Word Program Operation
Write Program Command
Programming Completed
Data Poll from System
S h e e t
Last Addresss?
Verify Word?
Sequence
START
for information on these status bits. See
®
Yes
Family
Yes
IL
( P r e l i m i n a r y )
Status Register on page 36
) immediately terminates the programming operation
No
No
Product Overview on page 9
Table 6.1 on page 54
S29GL_128S_01GS_00_02 March 21, 2011
Increment Address
for information on these
Figure 5.1
for program
for information on