29PL256N datasheet(23/74 Pages) SPANSION

23 / 74 page

June 6, 2007 S29PL-N_00_A5

S29PL-N MirrorBit

™ Flash Family

Da ta

Shee t

(Prelim i nar y )

7.3

Autoselect

The Autoselect mode allows the host system to access manufacturer and device identification, and verify

sector protection, through identifier codes output from the internal register (separate from the memory array)

on DQ15-DQ0. This mode is primarily intended to allow equipment to automatically match a device to be

programmed with its corresponding programming algorithm. When verifying sector protection, the sector

address must appear on the appropriate highest order address bits (see Table 7.5). The remaining address

bits are don't care. When all necessary bits have been set as required, the programming equipment can then

read the corresponding identifier code on DQ15-DQ0.

The Autoselect codes can also be accessed in-system through the command register. Note that if a Bank

Address (BA) on the four uppermost address bits is asserted during the third write cycle of the Autoselect

command, the host system can read Autoselect data from that bank and then immediately read array data

from the other bank, without exiting the Autoselect mode.

To access the Autoselect codes, the host system must issue the Autoselect command.

The Autoselect command sequence can be written to an address within a bank that is either in the read or

erase-suspend-read mode.

The Autoselect command cannot be written while the device is actively programming or erasing in the other

bank.

Autoselect does not support simultaneous operations or page modes.

The system must write the reset command to return to the read mode (or erase-suspend-read mode if the

bank was previously in Erase Suspend).

See Table 12.1 on page 66 for command sequence details.

Legend

L = Logic Low = VIL

H = Logic High = VIH

BA = Bank Address

SA = Sector Address

X = Don’t care

Note

For the PL129N either CE1# or CE2# must be low to access Autoselect Codes

Table 7.4 Autoselect Codes

Description

CE#

(See Note)

OE#

WE# Amax –A12 A10 A9 A8 A7 A6

A5 –A4

DQ15 to DQ0

Manufacturer ID

0001h

Read Cycle 1

LLL

227Eh

Read Cycle 2

223Ch (PL256N)

2220h (PL127N)

2221h (PL129N)

Read Cycle 3

2200h (PL256N)

2200h (PL127N)

2200h (PL129N)

Sector Protection

Verification

0000h

Unprotected (Neither DYB nor PPB

Locked)

0001h

Protected (Either DYB or PPB

Locked)

Indicator Bit

DQ15 - DQ8 = 0

DQ7 - Factory Lock Bit

1 = Locked

0 = Not Locked

DQ6 -Customer Lock Bit

1 = Locked

0 = Not Locked

DQ5 - Handshake Bit

1 = Reserved

0 = Standard Handshake

DQ4 & DQ3 -WP# Protection Boot Code

00 = WP# Protects both Top Boot

and Bottom Boot Sectors

11 = No WP# Protection

DQ2 - DQ0 = 0

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