M29W640FB STMICROELECTRONICS [STMicroelectronics], M29W640FB Datasheet - Page 23

• Manufacturer Part Number: M29W640FB
• Description: 64 Mbit (8Mb x8 or 4Mb x16, Page, Boot Block) 3V Supply Flash Memory
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M29W640FT, M29W640FB
4.2
4.2.1
4.2.2
Fast Program commands
Double Byte Program command
Quadruple Byte Program command
There are four Fast Program commands available to improve the programming throughput, by
writing several adjacent words or bytes in parallel. The Double, Quadruple and Octuple Byte
Program commands are available for x8 operations, while the Double Quadruple Word Program
command are available for x16 operations.
Fast Program commands can be suspended and then resumed by issuing a Program Suspend
command and a Program Resume command, respectively (see
Suspend command
When V
Program mode. The user can then choose to issue any of the Fast Program commands. Care
must be taken because applying a V
protected block.
The Double Byte Program command is used to write a page of two adjacent Bytes in parallel.
The two bytes must differ only in DQ15A-1. Three bus write cycles are necessary to issue the
Double Byte Program command.
1.
2.
3.
The Quadruple Byte Program command is used to write a page of four adjacent Bytes in
parallel. The four bytes must differ only for addresses A0, DQ15A-1. Five bus write cycles are
necessary to issue the Quadruple Byte Program command.
1.
2.
3.
4.
5.
The first bus cycle sets up the Double Byte Program Command.
The second bus cycle latches the Address and the Data of the first byte to be written.
The third bus cycle latches the Address and the Data of the second byte to be written.
The first bus cycle sets up the Quadruple Byte Program Command.
The second bus cycle latches the Address and the Data of the first byte to be written.
The third bus cycle latches the Address and the Data of the second byte to be written.
The fourth bus cycle latches the Address and the Data of the third byte to be written.
The fifth bus cycle latches the Address and the Data of the fourth byte to be written and
starts the Program/Erase Controller.
PPH
is applied to the V
and
Section 4.1.9: Program Resume
PP
/Write Protect pin the memory automatically enters the Fast
PPH
to the V
PP
/WP pin will temporarily unprotect any
command).
Section 4.1.8: Program
4 Command Interface
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