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 (11.5 V to 12.5 V) on address pin A9.
Address pins A6, A1, and A0 must be as shown in Table 7.4. In addition, when verifying sector protection, the
sector address must appear on the appropriate highest order address bits (see Table 7.2 on page 17 and
Table 7.3 on page 18). Table 7.4 shows 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 identifier code
To access the autoselect codes in-system, the host system can issue the autoselect command via the
command register, as shown in Table 10.1 on page 30. This method does not require VID. See Command
Definitions on page 25 for details on using the autoselect mode.
Table 7.4 S29AL016D Autoselect Codes (High Voltage Method)
Mode CE# OE# WE# A12 A10 A9 A7 A6 A4 A2 A1 A0 DQ15
Manufacturer ID: Spansion
X VID X L X L L L
(Top Boot Block)
X VID X L X L L H
(Bottom Boot Block)
X VID X L X L L H
Sector Protection Verification
H SA X VID X L X L H L
L = Logic Low = VIL
H = Logic High = VIH
SA = Sector Address
X = Don’t care
The autoselect codes may also be accessed in-system via command sequences. See Table 10.1 on page 30.
The hardware sector protection feature disables both program and erase operations in any sector. The
hardware sector unprotection feature re-enables both program and erase operations in previously protected
The device is shipped with all sectors unprotected. Spansion offers the option of programming and protecting
sectors at its factory prior to shipping the device through Spansion’s ExpressFlash™ Service. Contact a
Spansion representative for details.
It is possible to determine whether a sector is protected or unprotected. See Autoselect Mode on page 19 for
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 7.2 on page 21 shows the algorithms and Figure 17.12 on page 47 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 Spansion flash devices.
Details on this method are provided in a supplement, publication number 21468. Contact a Spansion
representative to request a copy.
February 27, 2009 S29AL016D_00_A8