S71GS256 datasheet(72/195 Pages) SPANSION

72 / 195 page

S29GLxxxN MirrorBitTM Flash Family

S29GLxxxN_MCP_A1 December 15, 2004

Advan ce

In form ati o n

After the Program Resume command is written, the device reverts to program-

ming. The system can determine the status of the program operation using the

DQ7 or DQ6 status bits, just as in the standard program operation. See Write Op-

eration Status for more information.

The system must write the Program Resume command (address bits are don’t

care) to exit the Program Suspend mode and continue the programming opera-

tion. Further writes of the Resume command are ignored. Another Program

Suspend command can be written after the device has resume programming.

Figure 3. Program Suspend/Program Resume

Chip Erase Command Sequence

Chip erase is a six bus cycle operation. The chip erase command sequence is ini-

tiated by writing two unlock cycles, followed by a set-up command. Two

additional unlock write cycles are then followed by the chip erase command,

which in turn invokes the Embedded Erase algorithm. The device does not require

the system to preprogram prior to erase. The Embedded Erase algorithm auto-

matically preprograms and verifies the entire memory for an all zero data pattern

prior to electrical erase. The system is not required to provide any controls or tim-

ings during these operations. Table 12 shows the address and data requirements

for the chip erase command sequence.

When the Embedded Erase algorithm is complete, the device returns to the read

mode and addresses are no longer latched. The system can determine the status

of the erase operation by using DQ7, DQ6, or DQ2. Refer to the Write Operation

Status section for information on these status bits.

Program Operation

or Write-to-Buffer

Sequence in Progress

Write Program Suspend

Command Sequence

Command is also valid for

Erase-suspended-program

operations

Autoselect and SecSi Sector

read operations are also allowed

Data cannot be read from erase- or

program-suspended sectors

Write Program Resume

Command Sequence

Read data as

required

Done

reading?

Yes

Write address/data

XXXh/30h

Device reverts to

operation prior to

Program Suspend

Write address/data

XXXh/B0h

Wait 15

µs

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