S29GL-P datasheet(21/71 Pages) SPANSION

21 / 71 page

November 21, 2006 S29GL-P_00_A3

S29GL-P MirrorBit

TM Flash Family

Da ta

Sh e e t

(Adv a n ce

In f o r m ation)

7.7

Program/Erase Operations

These devices are capable of several modes of programming and or erase operations which are described in

detail in the following sections.

During a write operation, the system must drive CE# and WE# to VIL and OE# to VIH when providing an

address, command, and data. Addresses are latched on the last falling edge of WE# or CE#, while data is

latched on the 1st rising edge of WE# or CE#.

The Unlock Bypass feature allows the host system to send program commands to the Flash device without

first writing unlock cycles within the command sequence. See Section 7.7.8 for details on the Unlock Bypass

function.

Note the following:

When the Embedded Program algorithm is complete, the device returns to the read mode.

The system can determine the status of the program operation by using DQ7 or DQ6. Refer to the Write

Operation Stat section for information on these status bits.

An “0” cannot be programmed back to a “1.” 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.

Secured Silicon Sector, Autoselect, and CFI functions are unavailable when a program operation is in

progress.

A hardware reset immediately terminates the program operation and the program command sequence

should be reinitiated once the device has returned to the read mode, to ensure data integrity.

Programming is allowed in any sequence and across sector boundaries for single word programming

operation.

Programming to the same word address multiple times without intervening erases is permitted.

7.7.1

Single Word Programming

Single word programming mode is one method of programming the Flash. In this mode, four Flash command

write cycles are used to program an individual Flash address. The data for this programming operation could

be 8 or 16-bits wide.

While the single word programming method is supported by all Spansion devices, in general it is not

recommended for devices that support Write Buffer Programming. See Table 12.1 on page 61 for the

required bus cycles and Figure 7.1 for the flowchart.

When the Embedded Program algorithm is complete, the device then returns to the read mode and

addresses are no longer latched. The system can determine the status of the program operation by using

DQ7 or DQ6. Refer to the Write Operation Status section for information on these status bits.

During programming, any command (except the Suspend Program command) is ignored.

The Secured Silicon Sector, Autoselect, and CFI functions are unavailable when a program operation is in

progress.

A hardware reset immediately terminates the program operation. The program command sequence should

be reinitiated once the device has returned to the read mode, to ensure data integrity.

Programming to the same address multiple times continuously (for example, “walking” a bit within a word)

is permitted.

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