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S75WS256Nxx Based MCPs

S75WS-N-00_00_A0 February 17, 2005

Data

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19.5 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 which the system was writing 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 se-

quence before programming begins (prior to the third cycle). This resets the device to which the

system was writing to the read mode. If the program command sequence is written to the device

that 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 ignores reset commands

until the operation is complete.

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

quence. Once in the autoselect mode, the reset command must be written to return to the read

mode. If a device entered the autoselect mode while in the Erase Suspend mode, writing the reset

command returns that 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 and

program-suspend-read mode if the device was in Program Suspend).

Note: If DQ1 goes high during a Write Buffer Programming operation, the system must

write the Write to Buffer Abort Reset command sequence to RESET the device to read-

ing array data. The standard RESET command will not work. See Table 19.9 for details

on this command sequence.

19.6 Autoselect Command Sequence

The autoselect command sequence allows the host system to access the manufacturer and device

codes, and determine whether or not a sector is protected. The Command Definitions table shows

the address and data requirements. The autoselect command sequence may be written to an ad-

dress within the device that is either in the read or erase-suspend-read mode. The autoselect

command may not be written while the device is actively programming or erasing.

The autoselect command sequence is initiated by first writing two unlock cycles. This is followed

by a third write cycle that contains the autoselect command. The device then enters the autose-

lect mode. No subsequent data will be made available if the autoselect data is read in synchronous

mode. The system may read at any address within the device any number of times without initi-

ating another autoselect command sequence. The following table describes the address

requirements for the various autoselect functions, and the resulting data. The device ID is read

in three cycles.

Table 19.10 Autoselect Addresses

Description

Address

Read Data

Manufacturer ID

00h

01h

Device ID, Word 1

01h

227Eh

Device ID, Word 2

0Eh

2229 (RS512N)

Device ID, Word 3

0Fh

2201 (RS512N)

Indicator Bits

03h

DQ15 - DQ5 = 0

DQ4 & DQ3 = 11

DQ2 - DQ0 = 0

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