AM29BL802CB datasheet(14/46 Pages) AMD

14 / 46 page

Am29BL802C

22371C7 November 3, 2006

D A TA

SH EET

Autoselect Mode

The autoselect mode provides manufacturer and de-

vice 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 (11.5 V to 12.5 V) on address pin

A9. Address pins A6, A1, and A0 must be as shown in

Table 1. In addition, when verifying sector protection,

the sector address must appear on the appropriate

highest order address bits (see Table 2). Table 1 shows

the remaining address bits that are don’t care. When all

necessary bits have been set as required, the program-

ming equipment may then read the corresponding

identifier code on DQ7-DQ0.

To access the autoselect codes in-system, the host

system can issue the autoselect command via the

command register, as shown in Table 4. This method

does not require VID. See “Command Definitions” for

details on using the autoselect mode.

Table 3.

Am29BL802C Autoselect Codes (High Voltage Method)

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

Note: The autoselect codes may also be accessed in-system via command sequences. See Table 4.

Sector Protection/Unprotection

The hardware sector protection feature disables both

program and erase operations in any sector. The hard-

ware sector unprotection feature re-enables both program

and erase operations in previously protected sectors.

The device is shipped with all sectors unprotected.

AMD offers the option of programming and protecting

sectors at its factory prior to shipping the device

through AMD’s ExpressFlash™ Service. Contact an

AMD representative for details.

It is possible to determine whether a sector is protected

or unprotected. See “Autoselect Mode” for details.

Sector protection/unprotection can be implemented via

two methods.

The primary method requires VID on the RESET# pin

only, and can be implemented either in-system or via

programming equipment. Figure 1 shows the algo-

rithms and Figure 24 shows the timing diagram. This

method uses standard microprocessor bus cycle

timing. For sector unprotect, all unprotected sectors

must first be protected prior to the first sector unprotect

write cycle.

The alternate method intended only for programming

equipment requires VID on address pin A9 and OE#.

This method is compatible with programmer routines

written for earlier 3.0 volt-only AMD flash devices. De-

tails on this method are provided in a supplement, pub-

lica t ion

n u mb er

22 37 2,

a v a ilab l e

www.spansion.com.

Description

CE#

OE#

WE#

A18

A12

A11

A10

DQ7

DQ0

Manufacturer ID: AMD

VID

XLXL

0001h

Device ID:

Am29BL802CB

(Bottom Boot Block)

VID

XLXL

0081h

Sector Protection Verification

VID

XLX

0001h (protected)

0000h (unprotected)

Burst Mode Status

VID

XLX

0000h

(non-burst mode)

0001h

(burst mode)

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