S29GL032A datasheet(45/88 Pages) SPANSION

45 / 88 page

January 28, 2005 S29GLxxxA_00_A2

S29GLxxxA MirrorBit™ Flash Family

Advance

Information

Command Definitions

Writing specific address and data commands or sequences into the command

command sequences. Writing incorrect address and data values or writing them

in the improper sequence may place the device in an unknown state. A reset com-

mand is then required to return the device to reading array data.

All addresses are latched on the falling edge of WE# or CE#, whichever happens

later. All data is latched on the rising edge of WE# or CE#, whichever happens

first. Refer to the AC Characteristics section for timing diagrams.

Reading Array Data

The device is automatically set to reading array data after device power-up. No

commands are required to retrieve data. The device is ready to read array data

after completing an Embedded Program or Embedded Erase algorithm.

After the device accepts an Erase Suspend command, the device enters the

erase-suspend-read mode, after which the system can read data from any non-

erase-suspended sector. After completing a programming operation in the Erase

Suspend mode, the system may once again read array data with the same ex-

ception. See the Erase Suspend/Erase Resume Commands section for more

information.

The system must issue the reset command to return the device to the read (or

erase-suspend-read) mode if DQ5 goes high during an active program or erase

operation, or if the device is in the autoselect mode. See the next section, Reset

Command, for more information.

See also Requirements for Reading Array Data in the Device Bus Operations sec-

tion for more information. The Read-Only Operations–“AC Characteristics”

section on page 67 provides the read parameters, and Figure 13 shows the timing

diagram.

Reset Command

Writing the reset command resets the device to the read or erase-suspend-read

mode. Address bits are don’t cares for this command.

The reset command may be written between the sequence cycles in an erase

command sequence before erasing begins. This resets the device to the read

mode. Once erasure begins, however, the device ignores reset commands until

the operation is complete.

The reset command may be written between the sequence cycles in a program

command sequence before programming begins. This resets the device to the

read mode. If the program command sequence is written while the device is in

the Erase Suspend mode, writing the reset command returns the device to the

erase-suspend-read mode. Once programming begins, however, the device ig-

nores reset commands until the operation is complete.

The reset command may be written between the sequence cycles in an autoselect

command sequence. Once in the autoselect mode, the reset command must be

written to return to the read mode. If the device entered the autoselect mode

while in the Erase Suspend mode, writing the reset command returns the device

to the erase-suspend-read mode.

S29GL032A Datasheet(PDF) 45 Page - SPANSION

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