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AM29LV116BT-90EC View Datasheet(PDF) - Advanced Micro Devices

Part NameDescriptionManufacturer
AM29LV116BT-90EC 16 Megabit (2 M x 8-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory AMD
Advanced Micro Devices AMD
AM29LV116BT-90EC Datasheet PDF : 40 Pages
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PRELIMINARY
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 4. In addition, when verifying sector protection,
the sector address must appear on the appropriate
highest order address bits (see Tables 2 and 3). Table
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 corre-
sponding 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 9. This method
does not require VID. See “Command Definitions” for
details on using the autoselect mode.
Table 4. Am29LV116B Autoselect Codes (High Voltage Method)
Description
A20 A12
A8
A5
to to
to
to
CE# OE# WE# A13 A10 A9 A7 A6 A2 A1 A0
DQ7
to
DQ0
Manufacturer ID: AMD
L
L
H
X
X VID X
L
X
L
L
01h
Device ID: Am29LV116B
(Top Boot Block)
L
L
H
X
X VID X
L
X
LH
C7h
Device ID: Am29LV116B
(Bottom Boot Block)
L
L
H
X
X VID X
L
X
LH
4Ch
01h
(protected)
Sector Protection Verification L
L
H SA X VID X
L
X
H
L
00h
(unprotected)
L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care.
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 pro-
gram and erase operations in previously protected
sectors. Sector protection/unprotection can be imple-
mented 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 21 shows the timing diagram. This
method uses standard microprocessor bus cycle tim-
ing. 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. Pub-
lication number 21586 contains further details; contact
an AMD representative to request a copy.
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.
Temporary Sector Unprotect
This feature allows temporary unprotection of previ-
ously protected sectors to change data in-system. The
Sector Unprotect mode is activated by setting the RE-
SET# pin to VID. During this mode, formerly protected
sectors can be programmed or erased by selecting the
sector addresses. Once VID is removed from the RE-
SET# pin, all the previously protected sectors are
protected again. Figure 2 shows the algorithm, and
Figure 20 shows the timing diagrams, for this feature.
11
Am29LV116B
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