AMD AM29F032B-75FI 32 megabit (4 m x 8-bit) cmos 5.0 volt-only, uniform sector flash memory Datasheet

Am29F032B
Data Sheet
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Publication Number 21610 Revision D
Amendment +1 Issue Date December 5, 2000
Am29F032B
32 Megabit (4 M x 8-Bit)
CMOS 5.0 Volt-only, Uniform Sector Flash Memory
DISTINCTIVE CHARACTERISTICS
■ 5.0 V ± 10%, single power supply operation
— Minimizes system level power requirements
■ Manufactured on 0.32 µm process technology
■ High performance
— Access times as fast as 70 ns
■ Low power consumption
— 30 mA typical active read current
— 30 mA typical program/erase current
— <1 µA typical standby current (standard access
time to active mode)
■ Flexible sector architecture
— 64 uniform sectors of 64 Kbytes each
— Any combination of sectors can be erased.
— Supports full chip erase
— Group sector protection:
— A hardware method of locking sector groups to
prevent any program or erase operations within
that sector group
— Temporary Sector Group Unprotect allows code
changes in previously locked sectors
■ Embedded Algorithms
— Embedded Erase algorithm automatically
preprograms and erases the entire chip or any
combination of designated sectors
■ Minimum 1,000,000 write/erase cycles
guaranteed
■ 20-year data retention at 125°C
— Reliable operation for the life of the system
■ Package options
— 40-pin TSOP
— 44-pin SO
■ Compatible with JEDEC standards
— Pinout and software compatible with
single-power-supply Flash standard
— Superior inadvertent write protection
■ Data# Polling and toggle bits
— Provides a software method of detecting program
or erase cycle completion
■ Ready/Busy output (RY/BY#)
— Provides a hardware method for detecting
program or erase cycle completion
■ Erase Suspend/Resume
— Suspends a sector erase operation to read data
from, or program data to, a non-erasing sector,
then resumes the erase operation
■ Hardware reset pin (RESET#)
— Resets internal state machine to the read mode
— Embedded Program algorithm automatically
writes and verifies bytes at specified addresses
This Data Sheet states AMD’s current technical specifications regarding the Product described herein. This Data
Sheet may be revised by subsequent versions or modifications due to changes in technical specifications.
Publication# 21610 Rev: D Amendment/+1
Issue Date: December 5, 2000
GENERAL DESCRIPTION
The Am29F032B is a 32 Mbit, 5.0 volt-only Flash
memory organized as 4,194,304 bytes of 8 bits each.
The 4 Mbytes of data are divided into 64 sectors of 64
Kbytes each for flexible erase capability. The 8 bits of
data appear on DQ0–DQ7. The Am29F032B is offered
in 40-pin TSOP and 44-pin SO packages. The
Am29F032B is manufactured using AMD’s 0.32 µm
process technology. This device is designed to be programmed in-system with the standard system 5.0 volt
VCC supply. A 12.0 volt VPP is not required for program
or erase operations. The device can also be programmed in standard EPROM programmers.
The standard device offers access times of 70, 90,
120, and 150 ns, allowing high-speed microprocessors
to operate without wait states. To eliminate bus contention, the device has separate chip enable (CE#),
write enable (WE#), and output enable (OE#) controls.
The device is entirely command set compatible with
the JEDEC single-power-supply Flash standard. Commands are written to the command register using standard microprocessor write timings. Register contents
serve as input to an internal state machine that controls the erase and programming circuitry. Write cycles
also internally latch addresses and data needed for
the programming and erase operations. Reading data
out of the device is similar to reading from 12.0 volt
Flash or EPROM devices.
The device is programmed by executing the program
command sequence. This invokes the Embedded Program algorithm—an internal algorithm that automatically times the program pulse widths and verifies
proper cell margin. The device is erased by executing
the erase command sequence. This invokes the Embedded Erase algorithm—an internal algorithm that
automatically preprograms the array (if it is not already
programmed) before executing the erase operation.
During erase, the device automatically times the erase
pulse widths and verifies proper cell margin.
2
The sector erase architecture allows memory sectors
to be erased and reprogrammed without affecting the
data contents of other sectors. A sector is typically
erased and verified within one second. The device is
erased when shipped from the factory.
The hardware sector group protection feature disables
both program and erase operations in any combination
of the eight sector groups of memory. A sector group
consists of four adjacent sectors.
The Erase Suspend feature enables the system to put
erase on hold for any period of time to read data from,
or program data to, a sector that is not being erased.
True background erase can thus be achieved.
The device requires only a single 5.0 volt power supply
for both read and write functions. Internally generated
and regulated voltages are provided for the program
and erase operations. A low VCC detector automatically inhibits write operations during power transitions.
The host system can detect whether a program or
erase cycle is complete by using the RY/BY# pin, the
DQ7 (Data# Polling) or DQ6 (toggle) status bits. After
a program or erase cycle has been completed, the device automatically returns to the read mode.
A hardware RESET# pin terminates any operation in
progress. The internal state machine is reset to the
read mode. The RESET# pin may be tied to the system reset circuitry. Therefore, if a system reset occurs
during either an Embedded Program or Embedded
Erase algorithm, the device is automatically reset to the
read mode. This enables the system’s microprocessor
to read the boot-up firmware from the Flash memory.
AMD’s Flash technology combines years of Flash
memory manufacturing experience to produce the
h i g h e s t l eve l s o f q u a l i t y, r e l i a b i l i t y, a n d c o s t
effectiveness. The device electrically erases all bits
within a sector simultaneously via Fowler-Nordheim
tunneling. The bytes are programmed one byte at
a time using the programming mechanism of hot
electron injection.
Am29F032B
TABLE OF CONTENTS
Product Selector Guide . . . . . . . . . . . . . . . . . . . . .
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connection Diagrams . . . . . . . . . . . . . . . . . . . . . .
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . .
Logic Symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ordering Information . . . . . . . . . . . . . . . . . . . . . . .
Device Bus Operations . . . . . . . . . . . . . . . . . . . . .
4
4
5
6
6
7
8
Table 1. Am29F032B Device Bus Operations .................................. 8
Requirements for Reading Array Data .....................................
Writing Commands/Command Sequences ..............................
Program and Erase Operation Status ......................................
Standby Mode ..........................................................................
RESET#: Hardware Reset Pin .................................................
Output Disable Mode................................................................
8
8
9
9
9
9
Table 2. Am29F032B Sector Address Table................................... 10
Autoselect Mode..................................................................... 11
Table 3. Am29F032B Autoselect Codes ......................................... 11
Sector Group Protection/Unprotection.................................... 12
Table 4. Sector Group Addresses................................................... 12
Temporary Sector Group Unprotect ....................................... 12
Figure 1. Temporary Sector Group Unprotect Operation................ 12
Hardware Data Protection ...................................................... 13
Low VCC Write Inhibit..................................................................... 13
Write Pulse “Glitch” Protection ........................................................ 13
Logical Inhibit .................................................................................. 13
Power-Up Write Inhibit .................................................................... 13
Command Definitions . . . . . . . . . . . . . . . . . . . . . 13
Reading Array Data ................................................................ 13
Reset Command..................................................................... 13
Autoselect Command Sequence ............................................ 14
Byte Program Command Sequence....................................... 14
Chip Erase Command Sequence ........................................... 14
Figure 2. Program Operation .......................................................... 15
Sector Erase Command Sequence ........................................ 15
Erase Suspend/Erase Resume Commands........................... 15
Figure 3. Erase Operation............................................................... 16
Command Definitions ............................................................. 17
Table 5. Am29F032B Command Definitions................................... 17
Write Operation Status . . . . . . . . . . . . . . . . . . . . 18
DQ7: Data# Polling................................................................. 18
Figure 4. Data# Polling Algorithm ................................................... 18
RY/BY#: Ready/Busy# ...........................................................
DQ6: Toggle Bit I ....................................................................
DQ2: Toggle Bit II ...................................................................
Reading Toggle Bits DQ6/DQ2 ..............................................
DQ5: Exceeded Timing Limits ................................................
19
19
19
19
20
DQ3: Sector Erase Timer ....................................................... 20
Figure 5. Toggle Bit Algorithm........................................................ 20
Table 6. Write Operation Status..................................................... 21
Absolute Maximum Ratings. . . . . . . . . . . . . . . . . 22
Figure 6. Maximum Negative Overshoot Waveform ...................... 22
Figure 7. Maximum Positive Overshoot Waveform........................ 22
Operating Ranges . . . . . . . . . . . . . . . . . . . . . . . . . 22
DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . 23
TTL/NMOS Compatible .......................................................... 23
CMOS Compatible.................................................................. 23
Test Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 8. Test Setup...................................................................... 24
Table 7. Test Specifications ........................................................... 24
Key To Switching Waveforms . . . . . . . . . . . . . . . 24
AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . 25
Read-only Operations............................................................. 25
Figure 9. Read Operation Timings ................................................. 25
Hardware Reset (RESET#) .................................................... 26
Figure 10. RESET# Timings .......................................................... 26
Write (Erase/Program) Operations ......................................... 27
Figure 11. Program Operation Timings..........................................
Figure 12. Chip/Sector Erase Operation Timings ..........................
Figure 13. Data# Polling Timings (During Embedded Algorithms).
Figure 14. Toggle Bit Timings (During Embedded Algorithms)......
Figure 15. DQ2 vs. DQ6.................................................................
28
29
30
30
31
Temporary Sector Unprotect .................................................. 31
Figure 16. Temporary Sector Group Unprotect Timings ................ 31
Write (Erase/Program) Operations—Alternate CE#
Controlled Writes .................................................................... 32
Figure 17. Alternate CE# Controlled Write Operation Timings ...... 33
Erase And Programming Performance . . . . . . . 34
Latchup Characteristic . . . . . . . . . . . . . . . . . . . . 34
TSOP And SO Pin Capacitance . . . . . . . . . . . . . 34
Data Retention. . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . 35
SO 044–44-Pin Small Outline Package.................................. 35
TS 040–40-Pin Standard Thin Small Outline Package........... 36
TSR040–40-Pin Reversed Thin Small Outline Package ........ 37
Revision Summary . . . . . . . . . . . . . . . . . . . . . . . . 38
Revision A (June 1998) .......................................................... 38
Revision B (July 1998)............................................................ 38
Revision C (January 1999) ..................................................... 38
Revision C+1 (April 14, 1999)................................................. 38
Revision D (November 17, 1999) ........................................... 38
Revision D+1 (December 5, 2000) ......................................... 38
Am29F032B
3
PRODUCT SELECTOR GUIDE
Family Part Number
Am29F032B
VCC = 5.0 V ± 5%
Speed Options
-75
VCC = 5.0 V ± 10%
-90
-120
-150
Max access time, ns (tACC)
70
90
120
150
Max CE# access time, ns (tCE)
70
90
120
150
Max OE# access time, ns (tOE)
40
40
50
75
Note: See “AC Characteristics” for full specifications.
BLOCK DIAGRAM
DQ0–DQ7
Sector Switches
VCC
VSS
Erase Voltage
Generator
RY/BY#
RESET#
WE#
Input/Output
Buffers
State
Control
Command
Register
PGM Voltage
Generator
Chip Enable
Output Enable
CE#
OE#
VCC Detector
Address Latch
STB
Timer
A0–A21
4
Am29F032B
STB
Data
Latch
Y-Decoder
Y-Gating
X-Decoder
Cell Matrix
CONNECTION DIAGRAMS
A19
A18
A17
A16
A15
A14
A13
A12
CE#
VCC
NC
RESET#
A11
A10
A9
A8
A7
A6
A5
A4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
A20
A21
WE#
OE#
RY/BY#
DQ7
DQ6
DQ5
DQ4
VCC
VSS
VSS
DQ3
DQ2
DQ1
DQ0
A0
A1
A2
A3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
40-Pin Standard TSOP
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
40-Pin Reverse TSOP
NC
RESET#
A11
A10
A9
A8
A7
A6
A5
A4
NC
NC
A3
A2
A1
A0
DQ0
DQ1
DQ2
DQ3
VSS
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
SO
Am29F032B
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
A20
A21
WE#
OE#
RY/BY#
DQ7
DQ6
DQ5
DQ4
VCC
VSS
VSS
DQ3
DQ2
DQ1
DQ0
A0
A1
A2
A3
A19
A18
A17
A16
A15
A14
A13
A12
CE#
VCC
NC
RESET#
A11
A10
A9
A8
A7
A6
A5
A4
VCC
CE#
A12
A13
A14
A15
A16
A17
A18
A19
NC
NC
A20
A21
WE#
OE#
RY/BY#
DQ7
DQ6
DQ5
DQ4
VCC
5
PIN CONFIGURATION
A0–A21
=
22 Addresses
DQ0–DQ7 =
8 Data Inputs/Outputs
CE#
=
Chip Enable
WE#
=
Write Enable
OE#
=
Output Enable
RESET#
=
Hardware Reset Pin, Active Low
RY/BY#
=
Ready/Busy Output
VCC
= +5.0 V single power supply
(see Product Selector Guide for
device speed ratings and voltage
supply tolerances)
VSS
=
Device Ground
NC
=
Pin Not Connected Internally
6
LOGIC SYMBOL
22
A0–A21
8
DQ0–DQ7
CE#
OE#
WE#
RESET#
Am29F032B
RY/BY#
ORDERING INFORMATION
Standard Products
AMD standard products are available in several packages and operating ranges. The order number (Valid Combination) is
formed by a combination of the following:
Am29F032B
-75
E
I
TEMPERATURE RANGE
C
= Commercial (0°C to +70°C)
I
= Industrial (–40°C to +85°C)
E
= Extended (–55°C to +125°C)
PACKAGE TYPE
E
= 40-Pin Thin Small Outline Package (TSOP) Standard Pinout (TS 040)
F
= 40-Pin Thin Small Outline Package (TSOP) Reverse Pinout (TSR040)
S
= 44-Pin Small Outline Package (SO 044)
SPEED OPTION
See Product Selector Guide and Valid Combinations
DEVICE NUMBER/DESCRIPTION
Am29F032B
32 Megabit (4 M x 8-Bit) CMOS 5.0 Volt-only Sector Erase Flash Memory
5.0 V Read, Program, and Erase
Valid Combinations
Valid Combinations
AM29F032B-75
EC, EI, FC, FI, SC, SI
AM29F032B-90
AM29F032B-120
EC, EI, EE, FC, FI, FE,
SC, SI, SE
Valid Combinations list configurations planned to be supported in volume for this device. Consult the local AMD sales office to confirm availability of specific valid combinations and
to check on newly released combinations.
AM29F032B-150
Am29F032B
7
DEVICE BUS OPERATIONS
This section describes the requirements and use of the
device bus operations, which are initiated through the
internal command register. The command register itself does not occupy any addressable memory location. The register is composed of latches that store the
commands, along with the address and data information needed to execute the command. The contents of
Table 1.
Operation
the register serve as inputs to the internal state machine. The state machine outputs dictate the function of
the device. The appropriate device bus operations
table lists the inputs and control levels required, and the
resulting output. The following subsections describe
each of these operations in further detail.
Am29F032B Device Bus Operations
CE#
OE#
WE#
RESET#
A0–A21
DQ0–DQ7
Read
L
L
H
H
AIN
DOUT
Write
L
H
L
H
AIN
DIN
VCC ± 0.5 V
X
X
VCC ± 0.5 V
X
High-Z
TTL Standby
H
X
X
H
X
High-Z
Output Disable
L
H
H
H
X
High-Z
Hardware Reset
X
X
X
L
X
High-Z
Temporary Sector Unprotect
(See Note)
X
X
X
VID
AIN
DIN
CMOS Standby
Legend:
L = Logic Low = VIL, H = Logic High = VIH, VID = 12.0 ± 0.5 V, X = Don’t Care, DIN = Data In, DOUT = Data Out, AIN = Address In
Note: See the sections Sector Group Protection and Temporary Sector Unprotect for more information.
Requirements for Reading Array Data
To read array data from the outputs, the system must
drive the CE# and OE# pins to VIL. CE# is the power
control and selects the device. OE# is the output control and gates array data to the output pins. WE#
should remain at VIH.
The internal state machine is set for reading array data
upon device power-up, or after a hardware reset. This
ensures that no spurious alteration of the memory
content occurs during the power transition. No command is necessary in this mode to obtain array data.
Standard microprocessor read cycles that assert valid
addresses on the device address inputs produce valid
data on the device data outputs. The device remains
enabled for read access until the command register
contents are altered.
See “Reading Array Data” for more information. Refer
to the AC Read Operations table for timing specifications and to the Read Operations Timings diagram for
the timing waveforms. ICC1 in the DC Characteristics
table represents the active current specification for
reading array data.
Writing Commands/Command Sequences
To write a command or command sequence (which includes programming data to the device and erasing
8
sectors of memory), the system must drive WE# and
CE# to VIL, and OE# to VIH.
An erase operation can erase one sector, multiple sectors, or the entire device. The Sector Address Tables
indicate the address space that each sector occupies.
A “sector address” consists of the address bits required to uniquely select a sector. See the “Writing
specific address and data commands or sequences
into the command register initiates device operations.
The Command Definitions table defines the valid register command sequences. Writing incorrect address
and data values or writing them in the improper sequence resets the device to reading array data.” section for details on erasing a sector or the entire chip, or
suspending/resuming the erase operation.
After the system writes the autoselect command sequence, the device enters the autoselect mode. The
system can then read autoselect codes from the internal register (which is separate from the memory array)
on DQ7–DQ0. Standard read cycle timings apply in
this mode. Refer to the “Autoselect Mode” and “Autoselect Command Sequence” sections for more information.
ICC2 in the DC Characteristics table represents the active current specification for the write mode. The “AC
Am29F032B
Characteristics” section contains timing specification
tables and timing diagrams for write operations.
Program and Erase Operation Status
During an erase or program operation, the system may
check the status of the operation by reading the status
bits on DQ7–DQ0. Standard read cycle timings and ICC
read specifications apply. Refer to “The Erase Resume
command is valid only during the Erase Suspend
mode.” for more information, and to each AC Characteristics section for timing diagrams.
Standby Mode
When the system is not reading or writing to the device,
it can place the device in the standby mode. In this
mode, current consumption is greatly reduced, and the
outputs are placed in the high impedance state, independent of the OE# input.
The device enters the CMOS standby mode when CE#
and RESET# pins are both held at VCC ± 0.5 V. (Note
that this is a more restricted voltage range than VIH.)
The device enters the TTL standby mode when CE#
and RESET# pins are both held at VIH. The device requires standard access time (tCE) for read access when
the device is in either of these standby modes, before it
is ready to read data.
The device also enters the standby mode when the RESET# pin is driven low. Refer to the next section, “RESET#: Hardware Reset Pin”.
If the device is deselected during erasure or programming, the device draws active current until the
operation is completed.
In the DC Characteristics tables, ICC3 represents the
standby current specification.
drives the RESET# pin low for at least a period of tRP,
the device immediately terminates any operation in
progress, tristates all data output pins, and ignores all
read/write attempts for the duration of the RESET#
pulse. The device also resets the internal state machine to reading array data. The operation that was interrupted should be reinitiated once the device is ready
to accept another command sequence, to ensure data
integrity.
Current is reduced for the duration of the RESET#
pulse. When RESET# is held at VIL, the device enters
the TTL standby mode; if RESET# is held at V SS ±
0.5 V, the device enters the CMOS standby mode.
The RESET# pin may be tied to the system reset circuitry. A system reset would thus also reset the Flash
memory, enabling the system to read the boot-up firmware from the Flash memory.
If RESET# is asserted during a program or erase operation, the RY/BY# pin remains a “0” (busy) until the internal reset operation is complete, which requires a
time of tREADY (during Embedded Algorithms). The system can thus monitor RY/BY# to determine whether the
reset operation is complete. If RESET# is asserted
when a program or erase operation is not executing
(RY/BY# pin is “1”), the reset operation is completed
within a time of tREADY (not during Embedded Algorithms). The system can read data tRH after the RESET# pin returns to VIH.
Refer to the AC Characteristics tables for RESET# parameters and timing diagram.
Output Disable Mode
When the OE# input is at VIH, output from the device is
disabled. The output pins are placed in the high impedance state.
RESET#: Hardware Reset Pin
The RESET# pin provides a hardware method of resetting the device to reading array data. When the system
Am29F032B
9
Table 2.
Am29F032B Sector Address Table
Sector
A21
A20
A19
A18
A17
A16
Sector Size
Address Range
SA0
0
0
0
0
0
0
64K
000000h–00FFFFh
SA1
0
0
0
0
0
1
64K
010000h–01FFFFh
SA2
0
0
0
0
1
0
64K
020000h–02FFFFh
SA3
0
0
0
0
1
1
64K
030000h–03FFFFh
SA4
0
0
0
1
0
0
64K
040000h–04FFFFh
SA5
0
0
0
1
0
1
64K
050000h–05FFFFh
SA6
0
0
0
1
1
0
64K
060000h–06FFFFh
SA7
0
0
0
1
1
1
64K
070000h–07FFFFh
SA8
0
0
1
0
0
0
64K
080000h–08FFFFh
SA9
0
0
1
0
0
1
64K
090000h–09FFFFh
SA10
0
0
1
0
1
0
64K
0A0000h–0AFFFFh
SA11
0
0
1
0
1
1
64K
0B0000h–0BFFFFh
SA12
0
0
1
1
0
0
64K
0C0000h–0CFFFFh
SA13
0
0
1
1
0
1
64K
0D0000h–0DFFFFh
SA14
0
0
1
1
1
0
64K
0E0000h–0EFFFFh
SA15
0
0
1
1
1
1
64K
0F0000h–0FFFFFh
SA16
0
1
0
0
0
0
64K
100000h–10FFFFh
SA17
0
1
0
0
0
1
64K
110000h–11FFFFh
SA18
0
1
0
0
1
0
64K
120000h–12FFFFh
SA19
0
1
0
0
1
1
64K
130000h–13FFFFh
SA20
0
1
0
1
0
0
64K
140000h–14FFFFh
SA21
0
1
0
1
0
1
64K
150000h–15FFFFh
SA22
0
1
0
1
1
0
64K
160000h–16FFFFh
SA23
0
1
0
1
1
1
64K
170000h–17FFFFh
SA24
0
1
1
0
0
0
64K
180000h–18FFFFh
SA25
0
1
1
0
0
1
64K
190000h–19FFFFh
SA26
0
1
1
0
1
0
64K
1A0000h–1AFFFFh
SA27
0
1
1
0
1
1
64K
1B0000h–1BFFFFh
SA28
0
1
1
1
0
0
64K
1C0000h–1CFFFFh
SA29
0
1
1
1
0
1
64K
1D0000h–1DFFFFh
SA30
0
1
1
1
1
0
64K
1E0000h–1EFFFFh
SA31
0
1
1
1
1
1
64K
1F0000h–1FFFFFh
SA32
1
0
0
0
0
0
64K
200000h–20FFFFh
SA33
1
0
0
0
0
1
64K
210000h–21FFFFh
SA34
1
0
0
0
1
0
64K
220000h–22FFFFh
SA35
1
0
0
0
1
1
64K
230000h–23FFFFh
SA36
1
0
0
1
0
0
64K
240000h–24FFFFh
SA37
1
0
0
1
0
1
64K
250000h–25FFFFh
SA38
1
0
0
1
1
0
64K
260000h–26FFFFh
SA39
1
0
0
1
1
1
64K
270000h–27FFFFh
SA40
1
0
1
0
0
0
64K
280000h–28FFFFh
SA41
1
0
1
0
0
1
64K
290000h–29FFFFh
SA42
1
0
1
0
1
0
64K
2A0000h–2AFFFFh
SA43
1
0
1
0
1
1
64K
2B0000h–2BFFFFh
10
Am29F032B
Table 2.
Am29F032B Sector Address Table (Continued)
Sector
A21
A20
A19
A18
A17
A16
Sector Size
Address Range
SA44
1
0
1
1
0
0
64K
2C0000h–2CFFFFh
SA45
1
0
1
1
0
1
64K
2D0000h–2DFFFFh
SA46
1
0
1
1
1
0
64K
2E0000h–2EFFFFh
SA47
1
0
1
1
1
1
64K
2F0000h–2FFFFFh
SA48
1
1
0
0
0
0
64K
300000h–30FFFFh
SA49
1
1
0
0
0
1
64K
310000h–31FFFFh
SA50
1
1
0
0
1
0
64K
320000h–32FFFFh
SA51
1
1
0
0
1
1
64K
330000h–33FFFFh
SA52
1
1
0
1
0
0
64K
340000h–34FFFFh
SA53
1
1
0
1
0
1
64K
350000h–35FFFFh
SA54
1
1
0
1
1
0
64K
360000h–36FFFFh
SA55
1
1
0
1
1
1
64K
370000h–37FFFFh
SA56
1
1
1
0
0
0
64K
380000h–38FFFFh
SA57
1
1
1
0
0
1
64K
390000h–39FFFFh
SA58
1
1
1
0
1
0
64K
3A0000h–3AFFFFh
SA59
1
1
1
0
1
1
64K
3B0000h–3BFFFFh
SA60
1
1
1
1
0
0
64K
3C0000h–3CFFFFh
SA61
1
1
1
1
0
1
64K
3D0000h–3DFFFFh
SA62
1
1
1
1
1
0
64K
3E0000h–3EFFFFh
SA63
1
1
1
1
1
1
64K
3F0000h–3FFFFFh
Note: All sectors are 64 Kbytes in size.
Autoselect Mode
tection, the sector group address must appear on the
appropriate highest order address bits (see Table 4).
Table 3 also 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 on DQ7-DQ0.
The autoselect mode provides manufacturer and device identification, and sector group 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.
To access the autoselect codes in-system, the host
system can issue the autoselect command via the
command register, as shown in Table 5. This method
does not require VID on an address line. Refer to the
Autoselect Command Sequence section for more information.
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 3. In addition, when verifying sector group proTable 3.
Am29F032B Autoselect Codes
A21-A18
A17-A10
A9
A8-A7
A6
A5-A2
A1
A0
Identifier Code on
DQ7-DQ0
Manufacturer ID: AMD
X
X
VID
X
VIL
X
VIL
VIL
01h
Device ID: Am29F032B
X
X
VID
X
VIL
X
VIL
VIH
41h
Sector Group Protection
Verification
Sector
Group
Address
X
VID
X
VIL
X
VIH
VIL
Description
01h (protected)
00h (unprotected)
Note: Identifier codes for manufacturer and device IDs exhibit odd parity with DQ7 defined as the parity bit.
Am29F032B
11
Sector Group Protection/Unprotection
Temporary Sector Group Unprotect
The hardware sector group protection feature disables
both program and erase operations in any sector
group. Each sector group consists of four adjacent
sectors. Table 4 shows how the sectors are grouped,
and the address range that each sector group contains. The hardware sector group unprotection feature
re-enables both program and erase operations in previously protected sector groups.
This feature allows temporary unprotection of previously protected sector groups to change data in-system. The Sector Group Unprotect mode is activated by
setting the RESET# pin to VID (11.5 V – 12.5 V). During this mode, formerly protected sector groups can be
programmed or erased by selecting the sector group
addresses. Once VID is removed from the RESET#
pin, all the previously protected sector groups are
protected again. Figure 1 shows the algorithm, and
Figure 16 shows the timing diagrams, for this feature.
Sector group protection/unprotection must be implemented using programming equipment. The procedure requires a high voltage (VID ) on address pin A9
and the control pins. Details on this method are provided in a supplement, publication number 22184.
Contact an AMD representative to obtain a copy of the
appropriate document.
START
RESET# = VID
(Note 1)
The device is shipped with all sector groups unprotected. AMD offers the option of programming and protecting sector groups at its factory prior to shipping the
device through AMD’s ExpressFlash™ Service. Contact an AMD representative for details.
Perform Erase or
Program Operations
It is possible to determine whether a sector group is
protected or unprotected. See “Autoselect Mode” for
details.
Table 4.
Temporary Sector Group
Unprotect Completed
(Note 2)
Sector Group Addresses
Sector
Group
A21
A20
A19
A18
Sectors
SGA0
0
0
0
0
SA0–SA3
SGA1
0
0
0
1
SA4–SA7
SGA2
0
0
1
0
SA8–SA11
SGA3
0
0
1
1
SA12–SA15
SGA4
0
1
0
0
SA16–SA19
SGA5
0
1
0
1
SA20–SA23
SGA6
0
1
1
0
SA24–SA27
SGA7
0
1
1
1
SA28–SA31
SGA8
1
0
0
0
SA32–SA35
SGA9
1
0
0
1
SA36–SA39
SGA10
1
0
1
0
SA40–SA43
SGA11
1
0
1
1
SA44–SA47
SGA12
1
1
0
0
SA48–SA51
SGA13
1
1
0
1
SA52–SA55
SGA14
1
1
1
0
SA56–SA59
SGA15
1
1
1
1
SA60–SA63
12
RESET# = VIH
Notes:
1. All protected sector groups unprotected.
2. All previously protected sector groups are protected
once again.
Figure 1.
Am29F032B
Temporary Sector Group Unprotect
Operation
Hardware Data Protection
The command sequence requirement of unlock cycles
for programming or erasing provides data protection.
In addition, the following hardware data protection
measures prevent accidental erasure or programming,
which might otherwise be caused by spurious system
level signals during VCC power-up and power-down
transitions, or from system noise.
Low VCC Write Inhibit
When VCC is less than VLKO (see DC Characteristics
for voltage levels), the device does not accept any
write cycles. This protects data during VCC power-up
and power-down. The command register and all internal program/erase circuits are disabled. Under this
condition the device resets to the read mode. Subsequent writes are ignored until the VCC level is greater
than VLKO. The system must ensure that the control
pins are logically correct to prevent unintentional
writes when VCC is above VLKO.
Write Pulse “Glitch” Protection
Noise pulses of less than 5 ns (typical) on OE#, CE#
or WE# do not initiate a write cycle.
Logical Inhibit
Write cycles are inhibited by holding any one of OE# =
VIL, CE# = VIH or WE# = VIH. To initiate a write cycle,
CE# and WE# must be at VIL while OE# is at VIH.
Power-Up Write Inhibit
If WE# = CE# = VIL and OE# = V IH during power up,
the device does not accept commands on the rising
edge of WE#. The internal state machine is automatically reset to the read mode on power-up.
COMMAND DEFINITIONS
Writing specific address and data commands or sequences into the command register initiates device operations. The Command Definitions table defines the
valid register command sequences. Writing incorrect
address and data values or writing them in the improper sequence resets the device to reading array
data.
All addresses are latched on the falling edge of WE# or
CE#, whichever happens later. All data is latched on
the rising edge of WE# or CE#, whichever happens
first. Refer to the appropriate timing diagrams in the
“AC Characteristics” section.
Reading Array Data
The device is automatically set to reading array data
after device power-up. No commands are required to
retrieve data. The device is also ready to read array
data after completing an Embedded Program or Embedded Erase algorithm.
After the device accepts an Erase Suspend command,
the device enters the Erase Suspend mode. The system can read array data using the standard read timings, except that if it reads at an address within erasesuspended sectors, the device outputs status data.
After completing a programming operation in the
Erase Suspend mode, the system may once again
read array data with the same exception. See “Erase
Suspend/Erase Resume Commands” for more information on this mode.
The system must issue the reset command to re-enable the device for reading array data if DQ5 goes
high, or while in the autoselect mode. See the “Reset
Command” section, next.
See also “Requirements for Reading Array Data” in
the “Device Bus Operations” section for more information. The Read Operations table provides the read parameters, and Read Operation Timings diagram
shows the timing diagram.
Reset Command
Writing the reset command to the device resets the
device to reading array data. Address bits are don’t
care for this command.
The reset command may be written between the sequence cycles in an erase command sequence before
erasing begins. This resets the device to reading array
data. Once erasure begins, however, the device ignores reset commands until the operation is complete.
The reset command may be written between the sequence cycles in a program command sequence before programming begins. This resets the device to
reading array data (also applies to programming in
Erase Suspend mode). Once programming begins,
however, the device ignores reset commands until the
operation is complete.
The reset command may be written between the sequence cycles in an autoselect command sequence.
Once in the autoselect mode, the reset command
must be written to return to reading array data (also
applies to autoselect during Erase Suspend).
If DQ5 goes high during a program or erase operation,
writing the reset command returns the device to reading array data (also applies during Erase Suspend).
Am29F032B
13
Autoselect Command Sequence
The autoselect command sequence allows the host
system to access the manufacturer and devices codes,
and determine whether or not a sector is protected.
The Command Definitions table shows the address
and data requirements. This method is an alternative to
that shown in the Autoselect Codes (High Voltage
Method) table, which is intended for PROM programmers and requires VID on address bit A9.
The autoselect command sequence is initiated by
writing two unlock cycles, followed by the autoselect
command. The device then enters the autoselect
mode, and the system may read at any address any
number of times, without initiating another command
sequence.
A read cycle at address XX00h retrieves the manufacturer code. A read cycle at address XX01h returns the
device code. A read cycle containing a sector address
(SA) and the address 02h in returns 01h if that sector
is protected, or 00h if it is unprotected. Refer to the
Sector Address tables for valid sector addresses.
The system must write the reset command to exit the
autoselect mode and return to reading array data.
Byte Program Command Sequence
Programming is a four-bus-cycle operation. The program command sequence is initiated by writing two unlock write cycles, followed by the program set-up
command. The program address and data are written
next, which in turn initiate the Embedded Program algorithm. The system is not required to provide further
controls or timings. The device automatically provides
internally generated program pulses and verify the programmed cell margin. The Command Definitions take
shows the address and data requirements for the byte
program command sequence.
When the Embedded Program algorithm is complete,
the device then returns to reading array data and addresses are no longer latched. The system can determine the status of the program operation by using DQ7,
DQ6, or RY/BY#. See “Write Operation Status” for information on these status bits.
Any commands written to the device during the Embedded Program Algorithm are ignored. Note that a
14
hardware reset immediately terminates the programming operation. The program command sequence
should be reinitiated once the device has reset to reading array data, to ensure data integrity.
Programming is allowed in any sequence and across
sector boundaries. A bit cannot be programmed
from a “0” back to a “1”. Attempting to do so may
halt the operation and set DQ5 to “1”, or cause the
Data# Polling algorithm to indicate the operation was
successful. However, a succeeding read will show that
the data is still “0”. Only erase operations can convert
a “0” to a “1”.
Chip Erase Command Sequence
Chip erase is a six-bus-cycle operation. The chip erase
command sequence is initiated by writing two unlock
cycles, followed by a set-up command. Two additional
unlock write cycles are then followed by the chip erase
command, which in turn invokes the Embedded Erase
algorithm. The device does not require the system to
preprogram prior to erase. The Embedded Erase algorithm automatically preprograms and verifies the entire
memory for an all zero data pattern prior to electrical
erase. The system is not required to provide any controls or timings during these operations. The Command
Definitions table shows the address and data requirements for the chip erase command sequence.
Any commands written to the chip during the Embedded Erase algorithm are ignored. Note that a hardware
reset during the chip erase operation immediately terminates the operation. The Chip Erase command sequence should be reinitiated once the device has
returned to reading array data, to ensure data integrity.
The system can determine the status of the erase
operation by using DQ7, DQ6, DQ2, or RY/BY#. See
“The Erase Resume command is valid only during
the Erase Suspend mode.” for information on these
status bits. When the Embedded Erase algorithm is
complete, the device returns to reading array data
and addresses are no longer latched.
Figure 3 illustrates the algorithm for the erase operation. See the Erase/Program Operations tables in “AC
Characteristics” for parameters, and to the Chip/Sector
Erase Operation Timings for timing waveforms.
Am29F032B
otherwise the last address and command might not be
accepted, and erasure may begin. It is recommended
that processor interrupts be disabled during this time to
ensure all commands are accepted. The interrupts can
be re-enabled after the last Sector Erase command is
written. If the time between additional sector erase
commands can be assumed to be less than 50 µs, the
system need not monitor DQ3. Any command other
than Sector Erase or Erase Suspend during the
time-out period resets the device to reading array
data. The system must rewrite the command sequence
and any additional sector addresses and commands.
START
Write Program
Command Sequence
Data Poll
from System
Embedded
Program
algorithm
in progress
Verify Data?
The system can monitor DQ3 to determine if the sector
erase timer has timed out. (See the “DQ3: Sector Erase
Timer” section.) The time-out begins from the rising
edge of the final WE# pulse in the command sequence.
No
Yes
Increment Address
No
Last Address?
When the Embedded Erase algorithm is complete, the
device returns to reading array data and addresses are
no longer latched. The system can determine the status of the erase operation by using DQ7, DQ6, DQ2, or
RY/BY#. Refer to “The Erase Resume command is
valid only during the Erase Suspend mode.” for information on these status bits.
Yes
Programming
Completed
Note: See Table 5 for program command sequence.
Figure 2.
Once the sector erase operation has begun, only the
Erase Suspend command is valid. All other commands
are ignored. Note that a hardware reset during the
sector erase operation immediately terminates the operation. The Sector Erase command sequence should
be reinitiated once the device has returned to reading
array data, to ensure data integrity.
Program Operation
Sector Erase Command Sequence
Sector erase is a six bus cycle operation. The sector
erase command sequence is initiated by writing two unlock cycles, followed by a set-up command. Two additional unlock write cycles are then followed by the
address of the sector to be erased, and the sector
erase command. The Command Definitions table
shows the address and data requirements for the sector erase command sequence.
The device does not require the system to preprogram
the memory prior to erase. The Embedded Erase algorithm automatically programs and verifies the sector for
an all zero data pattern prior to electrical erase. The
system is not required to provide any controls or timings during these operations.
After the command sequence is written, a sector erase
time-out of 50 µs begins. During the time-out period,
additional sector addresses and sector erase commands may be written. Loading the sector erase buffer
may be done in any sequence, and the number of sectors may be from one sector to all sectors. The time between these additional cycles must be less than 50 µs,
Figure 3 illustrates the algorithm for the erase operation. Refer to the Erase/Program Operations tables in
the “AC Characteristics” section for parameters, and to
the Sector Erase Operations Timing diagram for timing
waveforms.
Erase Suspend/Erase Resume Commands
The Erase Suspend command allows the system to interrupt a sector erase operation and then read data
from, or program data to, any sector not selected for
erasure. This command is valid only during the sector
erase operation, including the 50 µs time-out period
during the sector erase command sequence. The
Erase Suspend command is ignored if written during
the chip erase operation or Embedded Program algorithm. Writing the Erase Suspend command during the
Sector Erase time-out immediately terminates the
time-out period and suspends the erase operation. Addresses are “don’t-cares” when writing the Erase Suspend command.
When the Erase Suspend command is written during a
sector erase operation, the device requires a maximum
of 20 µs to suspend the erase operation. However,
when the Erase Suspend command is written during
the sector erase time-out, the device immediately ter-
Am29F032B
15
minates the time-out period and suspends the erase
operation.
Erase Suspend command can be written after the device has resumed erasing.
After the erase operation has been suspended, the
system can read array data from or program data to
any sector not selected for erasure. (The device “erase
suspends” all sectors selected for erasure.) Normal
read and write timings and command definitions apply.
Reading at any address within erase-suspended sectors produces status data on DQ7–DQ0. The system
can use DQ7, or DQ6 and DQ2 together, to determine
if a sector is actively erasing or is erase-suspended.
See “The Erase Resume command is valid only during
the Erase Suspend mode.” for information on these
status bits.
START
Write Erase
Command Sequence
Data Poll
from System
After an erase-suspended program operation is complete, the system can once again read array data within
non-suspended sectors. The system can determine
the status of the program operation using the DQ7 or
DQ6 status bits, just as in the standard program operation. See “The Erase Resume command is valid only
during the Erase Suspend mode.” for more information.
The system may also write the autoselect command
sequence when the device is in the Erase Suspend
mode. The device allows reading autoselect codes
even at addresses within erasing sectors, since the
codes are not stored in the memory array. When the
device exits the autoselect mode, the device reverts to
the Erase Suspend mode, and is ready for another
valid operation. See “Autoselect Command Sequence”
for more information.
The system must write the Erase Resume command
(address bits are “don’t care”) to exit the erase suspend
mode and continue the sector erase operation. Further
writes of the Resume command are ignored. Another
16
No
Embedded
Erase
algorithm
in progress
Data = FFh?
Yes
Erasure Completed
Notes:
1. See the appropriate Command Definitions table for erase
command sequence.
2. See “DQ3: Sector Erase Timer” for more information.
Am29F032B
Figure 3.
Erase Operation
Command Definitions
Command
Sequence
(Note 1)
Cycles
Table 5.
Am29F032B Command Definitions
Bus Cycles (Notes 2–4)
First
Second
Addr
Data
Third
Addr
Data
Addr
Fourth
Data Addr
Data
Read (Note 5)
1
RA
RD
Reset (Note 6)
1
XXX
F0
4
555
AA
2AA
55
555
90
X00
01
4
555
AA
2AA
55
555
90
X01
41
555
AA
2AA
55
555
90
SGA
X02
XX00
4
Manufacturer ID
Autoselect Device ID
(Note 7)
Sector Group Protect
Verify (Note 8)
Fifth
Sixth
Addr Data
Addr
Data
XX01
Program
4
555
AA
2AA
55
555
A0
PA
PD
Chip Erase
6
555
AA
2AA
55
555
80
555
AA
2AA
55
555
10
Sector Erase
6
555
AA
2AA
55
555
80
555
AA
2AA
55
SA
30
Erase Suspend (Note 9)
1
XXX
B0
Erase Resume (Note 10)
1
XXX
30
Legend:
X = Don’t care
PD = Data to be programmed at location PA. Data latches on
the rising edge of WE# or CE# pulse, whichever happens first.
RA = Address of the memory location to be read.
RD = Data read from location RA during read operation.
PA = Address of the memory location to be programmed.
Addresses latch on the falling edge of the WE# or CE# pulse,
whichever happens later.
Notes:
1. See Table 1 for description of bus operations.
SA = Address of the sector to be verified (in autoselect mode)
or erased. Address bits A21–A16 select a unique sector.
SGA = Address of the sector group to be verified. Address
bits A21–A18 select a unique sector group.
7. The fourth cycle of the autoselect command sequence is
a read cycle.
2. All values are in hexadecimal.
3. Except when reading array or autoselect data, all bus
cycles are write operations.
4. Address bits A21–A11 are don’t cares for unlock and
command cycles, unless SA or PA required.
5. No unlock or command cycles required when reading
array data.
6. The Reset command is required to return to reading array
data when device is in the autoselect mode, or if DQ5
goes high (while the device is providing status data).
8. The data is 00h for an unprotected sector group and 01h
for a protected sector group.See “Autoselect Command
Sequence” for more information.
9. The system may read and program in non-erasing
sectors, or enter the autoselect mode, when in the Erase
Suspend mode. The Erase Suspend command is valid
only during a sector erase operation.
10. The Erase Resume command is valid only during the
Erase Suspend mode.
Am29F032B
17
WRITE OPERATION STATUS
The device provides several bits to determine the status of a write operation: DQ2, DQ3, DQ5, DQ6, DQ7,
and RY/BY#. Table 6 and the following subsections describe the functions of these bits. DQ7, RY/BY#, and
DQ6 each offer a method for determining whether a
program or erase operation is complete or in progress.
These three bits are discussed first.
rithms) figure in the “AC Characteristics” section illustrates this.
Table 6 shows the outputs for Data# Polling on DQ7.
Figure 4 shows the Data# Polling algorithm.
START
DQ7: Data# Polling
The Data# Polling bit, DQ7, indicates to the host
sys tem whether an Embedded Algor ithm is in
progress or completed, or whether the device is in
Erase Suspend. Data# Polling is valid after the rising
edge of the final WE# pulse in the program or erase
command sequence.
During the Embedded Program algorithm, the device
outputs on DQ7 the complement of the datum programmed to DQ7. This DQ7 status also applies to programming during Erase Suspend. When the
Embedded Program algorithm is complete, the device
outputs the datum programmed to DQ7. The system
must provide the program address to read valid status
information on DQ7. If a program address falls within a
protected sector, Data# Polling on DQ7 is active for approximately 2 µs, then the device returns to reading
array data.
Read DQ7–DQ0
Addr = VA
DQ7 = Data?
No
No
When the system detects DQ7 has changed from the
complement to true data, it can read valid data at
DQ7–DQ0 on the following read cycles. This is bec a us e D Q 7 m ay c ha ng e as y n c hr on ou sly w it h
DQ0–DQ6 while Output Enable (OE#) is asserted low.
The Data# Polling Timings (During Embedded Algo-
18
DQ5 = 1?
Yes
During the Embedded Erase algorithm, Data# Polling
produces a “0” on DQ7. When the Embedded Erase algorithm is complete, or if the device enters the Erase
Suspend mode, Data# Polling produces a “1” on DQ7.
This is analogous to the complement/true datum output
described for the Embedded Program algorithm: the
erase function changes all the bits in a sector to “1”;
prior to this, the device outputs the “complement,” or
“0.” The system must provide an address within any of
the sectors selected for erasure to read valid status information on DQ7.
After an erase command sequence is written, if all sectors selected for erasing are protected, Data# Polling
on DQ7 is active for approximately 100 µs, then the device returns to reading array data. If not all selected
sectors are protected, the Embedded Erase algorithm
erases the unprotected sectors, and ignores the selected sectors that are protected.
Yes
Read DQ7–DQ0
Addr = VA
DQ7 = Data?
Yes
No
FAIL
PASS
Notes:
1. VA = Valid address for programming. During a sector
erase operation, a valid address is an address within
any sector selected for erasure. During chip erase, a
valid address is any non-protected sector address.
2. DQ7 should be rechecked even if DQ5 = “1” because
DQ7 may change simultaneously with DQ5.
Am29F032B
Figure 4.
Data# Polling Algorithm
RY/BY#: Ready/Busy#
The RY/BY# is a dedicated, open-drain output pin that
indicates whether an Embedded Algorithm is in
progress or complete. The RY/BY# status is valid after
the rising edge of the final WE# pulse in the command
sequence. Since RY/BY# is an open-drain output, several RY/BY# pins can be tied together in parallel with a
pull-up resistor to VCC.
If the output is low (Busy), the device is actively erasing
or programming. (This includes programming in the
Erase Suspend mode.) If the output is high (Ready),
the device is ready to read array data (including during
the Erase Suspend mode), or is in the standby mode.
Table 6 shows the outputs for RY/BY#. The timing diagrams for read, reset, program, and erase shows the
relationship of RY/BY# to other signals.
DQ6: Toggle Bit I
Toggle Bit I on DQ6 indicates whether an Embedded
Program or Erase algorithm is in progress or complete,
or whether the device has entered the Erase Suspend
mode. Toggle Bit I may be read at any address, and is
valid after the rising edge of the final WE# pulse in the
command sequence (prior to the program or erase operation), and during the sector erase time-out.
During an Embedded Program or Erase algorithm operation, successive read cycles to any address cause
DQ6 to toggle. (The system may use either OE# or
CE# to control the read cycles.) When the operation is
complete, DQ6 stops toggling.
After an erase command sequence is written, if all
sectors selected for erasing are protected, DQ6 toggles for approximately 100 µs, then returns to reading
array data. If not all selected sectors are protected,
the Embedded Erase algorithm erases the unprotected sectors, and ignores the selected sectors that
are protected.
The system can use DQ6 and DQ2 together to determine whether a sector is actively erasing or is erasesuspended. When the device is actively erasing (that is,
the Embedded Erase algorithm is in progress), DQ6
toggles. When the device enters the Erase Suspend
mode, DQ6 stops toggling. However, the system must
also use DQ2 to determine which sectors are erasing
or erase-suspended. Alternatively, the system can use
DQ7 (see the subsection on “DQ7: Data# Polling”).
If a program address falls within a protected sector,
DQ6 toggles for approximately 2 µs after the program
command sequence is written, then returns to reading
array data.
DQ6 also toggles during the erase-suspend-program
mode, and stops toggling once the Embedded Program algorithm is complete.
The Write Operation Status table shows the outputs for
Toggle Bit I on DQ6. Refer to Figure 5 for the toggle bit
algorithm, and to the Toggle Bit Timings figure in the
“AC Characteristics” section for the timing diagram.
The DQ2 vs. DQ6 figure shows the differences between DQ2 and DQ6 in graphical form. See also the
subsection on “DQ2: Toggle Bit II”.
DQ2: Toggle Bit II
The “Toggle Bit II” on DQ2, when used with DQ6, indicates whether a particular sector is actively erasing
(that is, the Embedded Erase algorithm is in progress),
or whether that sector is erase-suspended. Toggle Bit
II is valid after the rising edge of the final WE# pulse in
the command sequence.
DQ2 toggles when the system reads at addresses
within those sectors that have been selected for erasure. (The system may use either OE# or CE# to control the read cycles.) But DQ2 cannot distinguish
whether the sector is actively erasing or is erase-suspended. DQ6, by comparison, indicates whether the
device is actively erasing, or is in Erase Suspend, but
cannot distinguish which sectors are selected for erasure. Thus, both status bits are required for sector and
mode information. Refer to Table 6 to compare outputs
for DQ2 and DQ6.
Figure 5 shows the toggle bit algorithm in flowchart
form, and the section “DQ2: Toggle Bit II” explains the
algorithm. See also the “DQ6: Toggle Bit I” subsection.
Refer to the Toggle Bit Timings figure for the toggle bit
timing diagram. The DQ2 vs. DQ6 figure shows the differences between DQ2 and DQ6 in graphical form.
Reading Toggle Bits DQ6/DQ2
Refer to Figure 5 for the following discussion. Whenever the system initially begins reading toggle bit status, it must read DQ7–DQ0 at least twice in a row to
determine whether a toggle bit is toggling. Typically, a
system would note and store the value of the toggle bit
after the first read. After the second read, the system
would compare the new value of the toggle bit with the
first. If the toggle bit is not toggling, the device has
completed the program or erase operation. The system can read array data on DQ7–DQ0 on the following
read cycle.
However, if after the initial two read cycles, the system
determines that the toggle bit is still toggling, the
system also should note whether the value of DQ5 is
high (see the section on DQ5). If it is, the system
should then determine again whether the toggle bit is
toggling, since the toggle bit may have stopped toggling just as DQ5 went high. If the toggle bit is no longer
toggling, the device has successfully completed the
program or erase operation. If it is still toggling, the
device did not complete the operation successfully, and
Am29F032B
19
the system must write the reset command to return to
reading array data.
The remaining scenario is that the system initially determines that the toggle bit is toggling and DQ5 has not
gone high. The system may continue to monitor the
toggle bit and DQ5 through successive read cycles, determining the status as described in the previous paragraph. Alternatively, it may choose to perform other
system tasks. In this case, the system must start at the
beginning of the algorithm when it returns to determine
the status of the operation (top of Figure 5).
erase command. If DQ3 is high on the second status
check, the last command might not have been accepted. Table 6 shows the outputs for DQ3.
START
Read DQ7–DQ0
DQ5: Exceeded Timing Limits
DQ5 indicates whether the program or erase time has
exceeded a specified internal pulse count limit. Under
these conditions DQ5 produces a “1.” This is a failure
condition that indicates the program or erase cycle was
not successfully completed.
The DQ5 failure condition may appear if the system
tries to program a “1” to a location that is previously programmed to “0.” Only an erase operation can change
a “0” back to a “1.” Under this condition, the device
halts the operation, and when the operation has exceeded the timing limits, DQ5 produces a “1.”
Read DQ7–DQ0
(Note 1)
Toggle Bit
= Toggle?
No
Yes
No
Under both these conditions, the system must issue the
reset command to return the device to reading array
data.
DQ5 = 1?
Yes
DQ3: Sector Erase Timer
After writing a sector erase command sequence, the
system may read DQ3 to determine whether or not an
erase operation has begun. (The sector erase timer
does not apply to the chip erase command.) If additional sectors are selected for erasure, the entire timeout also applies after each additional sector erase
command. When the time-out is complete, DQ3
switches from “0” to “1.” The system may ignore DQ3
if the system can guarantee that the time between additional sector erase commands will always be less
than 50 µs. See also the “Sector Erase Command Sequence” section.
After the sector erase command sequence is written,
the system should read the status on DQ7 (Data# Polling) or DQ6 (Toggle Bit I) to ensure the device has accepted the command sequence, and then read DQ3. If
DQ3 is “1”, the internally controlled erase cycle has begun; all further commands (other than Erase Suspend)
are ignored until the erase operation is complete. If
DQ3 is “0”, the device will accept additional sector
erase commands. To ensure the command has been
accepted, the system software should check the status
of DQ3 prior to and following each subsequent sector
20
Read DQ7–DQ0
Twice
Toggle Bit
= Toggle?
(Notes
1, 2)
No
Yes
Program/Erase
Operation Not
Complete, Write
Reset Command
Program/Erase
Operation Complete
Notes:
1. Read toggle bit twice to determine whether or not it is
toggling. See text.
2. Recheck toggle bit because it may stop toggling as DQ5
changes to “1”. See text.
Am29F032B
Figure 5.
Toggle Bit Algorithm
Table 6.
DQ7
(Note 1)
DQ6
DQ5
(Note 2)
DQ3
DQ2
(Note 1)
RY/BY#
DQ7#
Toggle
0
N/A
No toggle
0
Embedded Erase Algorithm
0
Toggle
0
1
Toggle
0
Reading within Erase
Suspended Sector
1
No toggle
0
N/A
Toggle
1
Reading within Non-Erase
Suspended Sector
Data
Data
Data
Data
Data
1
Erase-Suspend-Program
DQ7#
Toggle
0
N/A
N/A
0
Operation
Standard
Mode
Erase
Suspend
Mode
Write Operation Status
Embedded Program Algorithm
Notes:
1. DQ7 and DQ2 require a valid address when reading status information. Refer to the appropriate subsection for further
details.
2. DQ5 switches to ‘1’ when an Embedded Program or Embedded Erase operation has exceeded the maximum timing limits.
See “DQ5: Exceeded Timing Limits” for more information.
Am29F032B
21
ABSOLUTE MAXIMUM RATINGS
Storage Temperature
Plastic Packages . . . . . . . . . . . . . . . –65°C to +150°C
Ambient Temperature
with Power Applied. . . . . . . . . . . . . . –55°C to +125°C
20 ns
20 ns
+0.8 V
Voltage with Respect to Ground
VCC (Note 1). . . . . . . . . . . . . . . . . . –2.0 V to 7.0 V
–0.5 V
A9, OE#, RESET# (Note 2) . . . . . –2.0 V to 13.0 V
–2.0 V
All other pins (Note 1) . . . . . . . . . . –2.0 V to 7.0 V
20 ns
Output Short Circuit Current (Note 3) . . . . . . 200 mA
Notes:
1. Minimum DC voltage on input or I/O pins is –0.5 V.
During voltage transitions, inputs may overshoot VSS to
–2.0 V for periods of up to 20 ns. See Figure 6. Maximum
DC voltage on output and I/O pins is VCC + 0.5 V. During
voltage transitions, outputs may overshoot to VCC + 2.0 V
for periods up to 20 ns. See Figure 7.
2. Minimum DC input voltage on A9, OE#, RESET# pins is
–0.5V. During voltage transitions, A9, OE#, RESET# pins
may overshoot VSS to –2.0 V for periods of up to 20 ns. See
Figure 6. Maximum DC input voltage on A9, OE#, and
RESET# is 13.0 V which may overshoot to 13.5 V for
periods up to 20 ns.
3. No more than one output shorted at a time. Duration of
the short circuit should not be greater than one second.
Figure 6. Maximum Negative
Overshoot Waveform
20 ns
VCC
+2.0 V
VCC
+0.5 V
2.0 V
Stresses greater than those listed in this section may cause
permanent damage to the device. This is a stress rating only;
functional operation of the device at these or any other conditions above those indicated in the operational sections of this
specification is not implied. Exposure of the device to absolute
maximum rating conditions for extended periods may affect device reliability.
OPERATING RANGES
Commercial (C) Devices
Ambient Temperature (TA) . . . . . . . . . . . 0°C to +70°C
Industrial (I) Devices
Ambient Temperature (TA) . . . . . . . . . –40°C to +85°C
Extended (E) Devices
Ambient Temperature (TA) . . . . . . . . –55°C to +125°C
VCC Supply Voltages
VCC for ± 5% devices . . . . . . . . . . .+4.75 V to +5.25 V
VCC for ± 10% devices . . . . . . . . . .+4.50 V to +5.50 V
Operating ranges define those limits between which the
functionality of the device is guaranteed.
22
Am29F032B
20 ns
20 ns
Figure 7. Maximum Positive
Overshoot Waveform
DC CHARACTERISTICS
TTL/NMOS Compatible
Parameter
Symbol
Parameter Description
Test Description
ILI
Input Load Current
VIN = VSS to VCC, VCC = VCC Max
ILIT
A9 Input Load Current
VCC = VCC Max, A9 = 12.0 V
ILO
Output Leakage Current
VOUT = VSS to VCC, VCC = VCC Max
Min
Typ
Max
Unit
±1.0
µA
50
µA
±1.0
µA
ICC1
VCC Read Current (Note 1)
CE# = VIL, OE# = VIH
30
40
mA
ICC2
VCC Write Current (Notes 2, 3)
CE# = VIL, OE# = VIH
40
60
mA
ICC3
VCC Standby Current
(CE# Controlled)
CE# = VIH, RESET# = VIH
0.4
1.0
mA
ICC4
VCC Standby Current
(RESET# Controlled)
VCC = VCC Max, RESET# = VIL
0.4
1.0
mA
VIL
Input Low Level
–0.5
0.8
V
VIH
Input High Level
2.0
VCC + 0.5
V
VID
Voltage for Autoselect and Sector
VCC = 5.0 V
Protect
11.5
12.5
V
VOL
Output Low Voltage
IOL = 12 mA, VCC = VCC Min
VOH
Output High Level
IOH = –2.5 mA VCC = VCC Min
VLKO
Low VCC Lock-out Voltage
0.45
2.4
V
V
3.2
4.2
V
Max
Unit
±1.0
µA
50
µA
CMOS Compatible
Parameter
Symbol
Parameter Description
Test Description
ILI
Input Load Current
VIN = VSS to VCC, VCC = VCC Max
ILIT
A9 Input Load Current
VCC = VCC Max, A9 = 12.0 V
Min
Typ
ILO
Output Leakage Current
VOUT = VSS to VCC, VCC = VCC Max
±1.0
µA
ICC1
VCC Read Current (Note 1)
CE# = VIL, OE# = VIH
30
40
mA
ICC2
VCC Write Current (Notes 2, 3)
CE# = VIL, OE# = VIH
30
40
mA
ICC3
VCC Standby Current
(CE# Controlled)
CE# = VCC ± 0.5 V,
RESET# = VCC ± 0.5 V
1
5
µA
ICC4
VCC Standby Current
(RESET# Controlled)
RESET# = VSS ± 0.5 V
1
5
µA
VIL
Input Low Level
–0.5
0.8
V
VIH
Input High Level
0.7x VCC
VCC + 0.3
V
VID
Voltage for Autoselect
and Sector Protect
VCC = 5.0 V
11.5
12.5
V
VOL
Output Low Voltage
IOL = 12 mA, VCC = VCC Min
0.45
V
VOH1
VOH2
VLKO
Output High Voltage
IOH = –2.5 mA, VCC = VCC Min
0.85 VCC
IOH = –100 µA, VCC = VCC Min
VCC – 0.4
Low VCC Lock-out Voltage
3.2
V
V
4.2
V
Notes for DC Characteristics (both tables):
1. The ICC current is typically less than 1 mA/MHz, with OE# at VIH.
2. ICC active while Embedded Program or Embedded Erase algorithm is in progress.
3. Not 100% tested.
Am29F032B
23
TEST CONDITIONS
Table 7.
5.0 V
Test Specifications
Test Condition
2.7 kΩ
Device
Under
Test
CL
-75
Output Load
6.2 kΩ
Figure 8.
Test Setup
Unit
1 TTL gate
Output Load Capacitance, CL
(including jig capacitance)
30
100
pF
Input Rise and Fall Times
5
20
ns
0.0–3.0
0.45–2.4
V
Input timing measurement
reference levels
1.5
0.8
V
Output timing measurement
reference levels
1.5
2.0
V
Input Pulse Levels
Note: Diodes are IN3064 or equivalent
All others
KEY TO SWITCHING WAVEFORMS
WAVEFORM
INPUTS
OUTPUTS
Steady
Changing from H to L
Changing from L to H
24
Don’t Care, Any Change Permitted
Changing, State Unknown
Does Not Apply
Center Line is High Impedance State (High Z)
Am29F032B
AC CHARACTERISTICS
Read-only Operations
Parameter Symbol
Speed Options
Test
Setup
JEDEC
Std
tAVAV
tRC
Read Cycle Time (Note 1)
tAVQV
tACC
Address to Output Delay
tELQV
tCE
Chip Enable to Output Delay
tGLQV
tOE
Output Enable to Output Delay
tOEH
Output Enable Hold
Time (Note 1)
tEHQZ
tDF
Chip Enable to Output High Z
(Note 1)
Max
20
20
30
35
ns
tGHQZ
tDF
Output Enable to Output High Z
(Note 1)
Max
20
20
30
35
ns
tAXQX
tOH
Output Hold Time From Addresses CE#
or OE# Whichever Occurs First
Min
0
ns
RESET# Pin Low to Read Mode
(Note 1)
Max
20
µs
tReady
Parameter Description
-75
-90
-120
-150
Unit
Min
70
90
120
150
ns
CE# = VIL
OE# = VIL
Max
70
90
120
150
ns
OE# = VIL
Max
70
90
120
150
ns
Max
40
40
50
55
ns
Read
Min
0
ns
Toggle and
Data# Polling
Min
10
ns
Notes:
1. Not 100% tested.
2. Refer to Figure 8 and Table 7 for test specifications.
tRC
Addresses Stable
Addresses
tACC
CE#
tDF
tOE
OE#
tOEH
WE#
tCE
tOH
HIGH Z
HIGH Z
Output Valid
Outputs
RESET#
RY/BY#
0V
Figure 9.
Read Operation Timings
Am29F032B
25
AC CHARACTERISTICS
Hardware Reset (RESET#)
Parameter
JEDEC
Std
Description
Test Setup
All Speed Options
Unit
tREADY
RESET# Pin Low (During Embedded
Algorithms) to Read or Write (See Note)
Max
20
µs
tREADY
RESET# Pin Low (NOT During Embedded
Algorithms) to Read or Write (See Note)
Max
500
ns
tRP
RESET# Pulse Width
Min
500
ns
tRH
RESET# High Time Before Read (See Note)
Min
50
ns
tRB
RY/BY# Recovery Time
Min
0
ns
Note: Not 100% tested.
RY/BY#
CE#, OE#
tRH
RESET#
tRP
tReady
Reset Timings NOT during Embedded Algorithms
Reset Timings during Embedded Algorithms
tReady
RY/BY#
tRB
CE#, OE#
RESET#
tRP
Figure 10.
26
RESET# Timings
Am29F032B
AC CHARACTERISTICS
Write (Erase/Program) Operations
Parameter
Speed Options
JEDEC
Std
Parameter Description
tAVAV
tWC
Write Cycle Time (Note 1)
Min
tAVWL
tAS
Address Setup Time
Min
tWLAX
tAH
Address Hold Time
Min
40
45
50
50
ns
tDVWH
tDS
Data Setup Time
Min
40
45
50
50
ns
tWHDX
tDH
Data Hold Time
Min
0
ns
tGHWL
tGHWL
Read Recover Time Before Write
(OE# high to WE# low)
Min
0
ns
tELWL
tCS
CE# Setup Time
Min
0
ns
tWHEH
tCH
CE# Hold Time
Min
0
ns
tWLWH
tWP
Write Pulse Width
Min
tWHWL
tWPH
Write Pulse Width High
Min
20
ns
tWHWH1
tWHWH1
Byte Programming Operation (Note 2)
Typ
7
µs
Typ
1
sec
tWHWH2
tWHWH2
Sector Erase Operation (Note 2)
Max
8
sec
50
µs
tVCS
VCC Set Up Time (Note 1)
Min
tBUSY
WE# to RY/BY# Valid
Min
-75
-90
-120
-150
Unit
70
90
120
150
ns
0
40
40
45
40
ns
50
50
50
60
ns
ns
Notes:
1. Not 100% tested.
2. See the “Erase And Programming Performance” section for more information.
Am29F032B
27
AC CHARACTERISTICS
Program Command Sequence (last two cycles)
tAS
tWC
Addresses
555h
Read Status Data (last two cycles)
PA
PA
PA
tAH
CE#
tCH
OE#
tWHWH1
tWP
WE#
tWPH
tCS
tDS
tDH
A0h
Data
PD
Status
tBUSY
RY/BY#
tVCS
VCC
Note: PA = program address, PD = program data, DOUT is the true data at the program address.
Figure 11.
28
Program Operation Timings
Am29F032B
DOUT
tRB
AC CHARACTERISTICS
tAS
tWC
Addresses
2AAh
VA
SA
VA
555h for chip erase
tAH
CE#
tCH
OE#
tWP
WE#
tWPH
tCS
tWHWH2
tDS
tDH
Data
55h
In
Progress
30h
Complete
10 for Chip Erase
tBUSY
tRB
RY/BY#
tVCS
VCC
Note: SA = Sector Address. VA = Valid Address for reading status data.
Figure 12.
Chip/Sector Erase Operation Timings
Am29F032B
29
AC CHARACTERISTICS
tRC
Addresses
VA
VA
VA
tACC
tCE
CE#
tCH
tOE
OE#
tOEH
tDF
WE#
tOH
High Z
DQ7
Complement
Complement
DQ0–DQ6
Status Data
Status Data
Valid Data
True
High Z
Valid Data
True
tBUSY
RY/BY#
Note:
VA = Valid address. Illustration shows first status cycle after command sequence, last status read cycle, and array data read cycle.
Figure 13.
Data# Polling Timings (During Embedded Algorithms)
tRC
Addresses
VA
VA
VA
VA
tACC
tCE
CE#
tCH
tOE
OE#
tOEH
tDF
WE#
tOH
High Z
DQ6/DQ2
tBUSY
Valid Status
Valid Status
(first read)
(second read)
Valid Status
Valid Data
(stops toggling)
RY/BY#
Note:
VA = Valid address; not required for DQ6. Illustration shows first two status cycle after command sequence, last status read cycle,
and array data read cycle.
Figure 14.
30
Toggle Bit Timings (During Embedded Algorithms)
Am29F032B
AC CHARACTERISTICS
Enter
Embedded
Erasing
Erase
Suspend
Erase
WE#
Enter Erase
Suspend Program
Erase
Resume
Erase
Suspend
Program
Erase Suspend
Read
Erase Suspend
Read
Erase
Complete
Erase
DQ6
DQ2
Note: The system may use OE# or CE# to toggle DQ2 and DQ6. DQ2 toggles only when read at an address within the
erase-suspended sector.
Figure 15.
DQ2 vs. DQ6
Temporary Sector Unprotect
Parameter
JEDEC
Std
Description
tVIDR
VID Rise and Fall Time (See Note)
tRSP
RESET# Setup Time for Temporary Sector
Unprotect
All Speed Options
Unit
Min
500
ns
Min
4
µs
Note: Not 100% tested.
12 V
RESET#
0 or 5 V
0 or 5 V
tVIDR
tVIDR
Program or Erase Command Sequence
CE#
WE#
tRSP
RY/BY#
Figure 16.
Temporary Sector Group Unprotect Timings
Am29F032B
31
AC CHARACTERISTICS
Write (Erase/Program) Operations—Alternate CE# Controlled Writes
Parameter Symbol
Speed Options
JEDEC
Std
Parameter Description
tAVAV
tWC
Write Cycle Time (Note 1)
Min
tAVEL
tAS
Address Setup Time
Min
tELAX
tAH
Address Hold Time
Min
40
45
50
50
ns
tDVEH
tDS
Data Setup Time
Min
40
45
50
50
ns
tEHDX
tDH
Address Hold Time
Min
0
ns
tGHEL
tGHEL
Read Recover Time Before Write
Min
0
ns
tWLEL
tWS
CE# Setup Time
Min
0
ns
tEHWH
tWH
CE# Hold Time
Min
0
ns
tELEH
tCP
Write Pulse Width
Min
tEHEL
tCPH
Write Pulse Width High
Min
20
ns
tWHWH1
tWHWH1
Byte Programming Operation (Note 2)
Typ
7
µs
Typ
1
sec
tWHWH2
tWHWH2
Sector Erase Operation (Note 2)
Max
8
sec
Notes:
1. Not 100% tested.
2. See the “Erase And Programming Performance” section for more information.
32
Am29F032B
-75
-90
-120
-150
Unit
70
90
120
150
ns
0
40
45
ns
50
50
ns
AC CHARACTERISTICS
555 for program
2AA for erase
PA for program
SA for sector erase
555 for chip erase
Data# Polling
Addresses
PA
tWC
tAS
tAH
tWH
WE#
tGHEL
OE#
tWHWH1 or 2
tCP
CE#
tWS
tCPH
tBUSY
tDS
tDH
DQ7#
Data
tRH
A0 for program
55 for erase
DOUT
PD for program
30 for sector erase
10 for chip erase
RESET#
RY/BY#
Notes:
1. PA = Program Address, PD = Program Data, SA = Sector Address, DQ7# = Complement of Data Input, DOUT = Array Data.
2. Figure indicates the last two bus cycles of the command sequence.
Figure 17.
Alternate CE# Controlled Write Operation Timings
Am29F032B
33
ERASE AND PROGRAMMING PERFORMANCE
Parameter
Typ (Note 1)
Max (Note 2)
Unit
Sector Erase Time
1
8
sec
Chip Erase Time
64
Byte Programming Time
7
300
µs
28.8
86.4
sec
Chip Programming Time (Note 3)
sec
Comments
Excludes 00h programming prior to
erasure (Note 4)
Excludes system-level overhead
(Note 5)
Notes:
1. Typical program and erase times assume the following conditions: 25°C, 5.0 V VCC, 1,000,000 cycles. Additionally,
programming typicals assume checkerboard pattern.
2. Under worst case conditions of 90°C, VCC = 4.5 V, 1,000,000 cycles (4.75 V for -75).
3. The typical chip programming time is considerably less than the maximum chip programming time listed, since most bytes
program faster than the maximum byte program time listed. If the maximum byte program time given is exceeded, only then does
the device set DQ5 = 1. See the section on DQ5 for further information.
4. In the pre-programming step of the Embedded Erase algorithm, all bytes are programmed to 00h before erasure.
5. System-level overhead is the time required to execute the four-bus-cycle sequence for programming. See Table 5 for further
information on command definitions.
6. The device has a minimum erase and program cycle endurance of 1,000,000 cycles.
LATCHUP CHARACTERISTIC
Description
Input Voltage with respect to VSS on I/O pins
VCC Current
Min
Max
–1.0 V
VCC + 1.0 V
–100 mA
+100 mA
Note: Includes all pins except VCC. Test conditions: VCC = 5.0 Volt, one pin at a time.
TSOP AND SO PIN CAPACITANCE
Parameter
Symbol
Parameter Description
Test Conditions
Min
Max
Unit
6
7.5
pF
Input Capacitance
VIN = 0
COUT
Output Capacitance
VOUT = 0
8.5
12
pF
CIN2
Control Pin Capacitance
VIN = 0
7.5
9
pF
CIN
Notes:
1. Sampled, not 100% tested.
2. Test conditions TA = 25°C, f = 1.0 MHz.
DATA RETENTION
Parameter
Test Conditions
Min
Unit
150°C
10
Years
125°C
20
Years
Minimum Pattern Data Retention Time
34
Am29F032B
PHYSICAL DIMENSIONS
SO 044–44-Pin Small Outline Package
Dwg rev AC; 10/99
Am29F032B
35
PHYSICAL DIMENSIONS
TS 040–40-Pin Standard Thin Small Outline Package
Dwg rev AA; 10/99
36
Am29F032B
PHYSICAL DIMENSIONS
TSR040–40-Pin Reversed Thin Small Outline Package
Dwg rev AA; 10/99
Am29F032B
37
REVISION SUMMARY
Revision A (June 1998)
Data Retention
Initial release.
Added table.
Revision B (July 1998)
Revision D (November 17, 1999)
Distinctive Characteristics
AC Characteristics—Figure 11. Program
Operations Timing and Figure 12. Chip/Sector
Erase Operations
Changed typical active read current to 30 mA to match
DC Characteristics table.
Operating Ranges
Deleted tGHWL and changed OE# waveform to start at
high.
Corrected temperature range descriptions to “ambient.”
Physical Dimensions
Replaced figures with more detailed illustrations.
Revision C (January 1999)
Revision D+1 (December 5, 2000)
Distinctive Characteristics
Added table of contents.
Added 20-year data retention subbullet.
Ordering Information
Revision C+1 (April 14, 1999)
Deleted burn-in option.
Deleted duplicate sections in the full data sheet.
Trademarks
Copyright © 2000 Advanced Micro Devices, Inc. All rights reserved.
AMD, the AMD logo, and combinations thereof are registered trademarks of Advanced Micro Devices, Inc.
ExpressFlash is a trademark of Advanced Micro Devices, Inc.
Product names used in this publication are for identification purposes only and may be trademarks of their respective companies.
38
Am29F032B
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