S71PL254 datasheet(49/196 Pages) SPANSION

49 / 196 page

August 12, 2004 S29PL127J_064J_032J_MCP_00_A3

S29PL127J/S29PL064J/S29PL032J for MCP

Advance

I n f o rmatio n

Autoselect Mode

The autoselect mode provides manufacturer and device identification, and sector

protection verification, through identifier codes output on DQ7–DQ0. This mode

is primarily intended for programming equipment to automatically match a device

to be programmed with its corresponding programming algorithm. However, the

autoselect codes can also be accessed in-system through the command register.

When using programming equipment, the autoselect mode requires VID on ad-

dress pin A9. Address pins must be as shown in Table 8 and Table 11. In addition,

when verifying sector protection, the sector address must appear on the appro-

priate highest order address bits (see Table 3). Table 8 and Table 11 show the

remaining address bits that are don’t care. When all necessary bits have been set

as required, the programming equipment may then read the corresponding iden-

tifier code on DQ7–DQ0. However, the autoselect codes can also be accessed in-

system through the command register, for instances when the device is erased

or programmed in a system without access to high voltage on the A9 pin. The

command sequence is illustrated in Table 17. Note that if a Bank Address (BA)

(on address bits PL127J: A22–A20, PL064J: A21–A19, PL032J: A20–A18) is as-

serted during the third write cycle of the autoselect command, the host system

can read autoselect data that bank and then immediately read array data from

the other bank, without exiting the autoselect mode.

To access the autoselect codes in-system, the host system can issue the autose-

lect command via the command register, as shown in Table 17. This method does

not require VID. Refer to the Autoselect Command Sequence for more

information.

Legend: L = Logic Low = VIL, H = Logic High = VIH, BA = Bank Address, SA = Sector Address, X = Don’t care.

Note: The autoselect codes may also be accessed in-system via command sequences

Table 8. Autoselect Codes (High Voltage Method)

Description

CE#

OE#

WE#

Amax

A12

A9 A8

DQ15

to DQ0

Manufacturer ID:

Spansion

products

VID

0001h

Read

Cycle 1

VID

227Eh

Read

Cycle 2

2220h (PL127J)

2202h (PL064J)

220Ah (PL032J)

Read

Cycle 3

2200h (PL127J)

2201h (PL064J)

2201h (PL032J)

Sector Protection

Verification

VID

0001h (protected),

0000h (unprotected)

Secured Silicon

Indicator Bit

(DQ7, DQ6)

VID

00C4h (factory and

customer locked), 0084h

(factory locked), 0004h

(not locked)

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