s29cd-j Meet Spansion Inc., s29cd-j Datasheet - Page 30

• Manufacturer Part Number: s29cd-j
• Description: 32/16 Megabit Cmos 2.6 Volt Or 3.3 Volt-only Simultaneous Read/write, Dual Boot, Burst Mode Flash Memory With Versatilei/o?
• Manufacturer: Meet Spansion Inc.

30
8.7.1
Programming
Programming is a four-bus-cycle operation. The program command sequence is initiated by writing two
unlock write cycles, followed by the program setup command. The program address and data are written
next, which in turn initiate the Embedded Program algorithm. The system is not required to provide further
controls or timings. The device automatically generates the program pulses and verifies the programmed cell
margin.
program command sequence.
Note the following:
Note
See
When the Embedded Program algorithm is complete, the device returns to the read mode and address are
no longer latched. An address change is required to begin reading valid array data.
The system can determine the status of the program operation by using DQ7, DQ6 or RY/BY#. Refer to
Section 8.8, Write Operation Status on page 34
A “0” cannot be programmed back to a “1.” Attempting to do so may halt the operation and set DQ5 to 1, or
cause the Data# Polling algorithm to indicate the operation was successful. . A succeeding read shows that
the data is still “0.” Only erase operations can convert a “0” to a “1.”
Any commands written to the device during the Embedded Program Algorithm are ignored except the
Program Suspend command.
A hardware reset immediately terminates the program operation; the program command sequence should
be re-initiated once the device has returned to the read mode, to ensure data integrity.
Table 19.1
Section 20.1, Command Definitions on page 72
and
Table 20.2
for program command sequence.
Increment Address
S29CD-J & S29CL-J Flash Family
D a t a
Figure 8.5 Program Operation
in progress
Embedded
algorithm
Program
S h e e t
No
for information on these status bits.
( P r e l i m i n a r y )
Command Sequence
shows the address and data requirements for the
Write Program
Last Address?
Programming
from System
Verify Data?
Completed
Data Poll
START
Yes
Yes
S29CD-J_CL-J_00_B2 March 7, 2007
No