S71GS256 datasheet(66/195 Pages) SPANSION

66 / 195 page

S29GLxxxN MirrorBitTM Flash Family

S29GLxxxN_MCP_A1 December 15, 2004

Advan ce

In form ati o n

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 provides the read parameters, and Figure 11 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.

If DQ5 goes high during a program or erase operation, writing the reset command

returns the device to the read mode (or erase-suspend-read mode if the device

was in Erase Suspend).

Note that if DQ1 goes high during a Write Buffer Programming operation, the sys-

tem must write the Write-to-Buffer-Abort Reset command sequence to reset the

device for the next operation.

Autoselect Command Sequence

The autoselect command sequence allows the host system to access the manu-

facturer and device codes, and determine whether or not a sector is protected.

Table 12 shows the address and data requirements. This method is an alternative

to that shown in Table 5, which is intended for PROM programmers and requires

VID on address pin A9. The autoselect command sequence may be written to an

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