S71GS256 datasheet(88/195 Pages) SPANSION

88 / 195 page

S29GLxxxN MirrorBitTM Flash Family

S29GLxxxN_MCP_A1 December 15, 2004

Advan ce

In form ati o n

the entire time-out also applies after each additional sector erase command.

When the time-out period is complete, DQ3 switches from a “0” to a “1.” If the

time between additional sector erase commands from the system can be as-

sumed to be less than 50 µs, the system need not monitor DQ3. See also the

Sector Erase Command Sequence section.

After the sector erase command is written, the system should read the status of

DQ7 (Data# Polling) or DQ6 (Toggle Bit I) to ensure that the device has accepted

the command sequence, and then read DQ3. If DQ3 is “1,” the Embedded Erase

algorithm has begun; all further commands (except Erase Suspend) are ignored

until the erase operation is complete. If DQ3 is “0,” the device will accept addi-

tional sector erase commands. To ensure the command has been accepted, the

system software should check the status of DQ3 prior to and following each sub-

sequent sector erase command. If DQ3 is high on the second status check, the

last command might not have been accepted.

Table 13 shows the status of DQ3 relative to the other status bits.

DQ1: Write-to-Buffer Abort

DQ1 indicates whether a Write-to-Buffer operation was aborted. Under these

conditions DQ1 produces a “1”. The system must issue the Write-to-Buffer-Abort-

Reset command sequence to return the device to reading array data. See Write

Buffer section for more details.

Table 13. Write Operation Status

Notes:

1. DQ5 switches to ‘1’ when an Embedded Program, Embedded Erase, or Write-to-Buffer operation has exceeded the maximum

timing limits. Refer to the section on DQ5 for more information.

2. DQ7 and DQ2 require a valid address when reading status information. Refer to the appropriate subsection for further

details.

3. The Data# Polling algorithm should be used to monitor the last loaded write-buffer address location.

4. DQ1 switches to ‘1’ when the device has aborted the write-to-buffer operation.

Status

DQ7

(Note 2)

DQ6

DQ5

(Note 1)

DQ3

DQ2

(Note 2)

DQ1

RY/

BY#

Standard

Mode

Embedded Program Algorithm

DQ7#

Toggle

N/A

No toggle

Embedded Erase Algorithm

Toggle

N/A

Program

Suspend

Mode

Program-

Suspend

Read

Program-Suspended

Sector

Invalid (not allowed)

Non-Program

Suspended Sector

Data

Erase

Suspend

Mode

Erase-

Suspend

Read

Erase-Suspended

Sector

No toggle

N/A

Toggle

N/A

Non-Erase

Suspended Sector

Data

Erase-Suspend-Program

(Embedded Program)

DQ7#

Toggle

N/A

Write-to-

Buffer

Busy (Note 3)

DQ7#

Toggle

N/A

Abort (Note 4)

DQ7#

Toggle

N/A

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