AM29F002 Advanced Micro Devices, AM29F002 Datasheet - Page 8

• Manufacturer Part Number: AM29F002
• Description: 2 Megabit (256 K x 8-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory
• Manufacturer: Advanced Micro Devices

Status” for more information, and to each AC Charac-
teristics 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, inde-
pendent of the OE# input.
The device enters the CMOS standby mode when CE#
and RESET# pins (CE# only on the Am29F002N) are
both held at V
stricted voltage range than V
TTL standby mode when CE# and RESET# pins (CE#
only on the Am29F002N) are both held at V
vice requires standard access time (t
cess 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 RE-
SET# pin is driven low. Refer to the next section, “RE-
SET#: Hardware Reset Pin”.
If the device is deselected during erasure or program-
ming, the device draws active current until the
operation is completed.
In the DC Characteristics tables, I
standby current specification.
If the device is deselected during erasure or program-
ming, the device draws active current until the
operation is completed.
I
standby current specification.
8
CC3
Sector
SA0
SA1
SA2
SA3
SA4
SA5
SA6
in the DC Characteristics tables represents the
CC
A17
0
0
1
1
1
1
1
Table 2. Am29F002/Am29F002N Top Boot Block Sector Address Table
0.5 V. (Note that this is a more re-
A16
0
1
0
1
1
1
1
IH
.) The device enters the
CC3
A15
CE
X
X
X
0
1
1
1
represents the
) for read ac-
IH
Am29F002/Am29F002N
. The de-
P R E L I M I N A R Y
A14
X
X
X
X
0
0
1
A13
X
X
X
X
X
0
1
RESET#: Hardware Reset Pin
Note: The RESET# pin is not available on the
Am29F002N.
The RESET# pin provides a hardware method of reset-
ting the device to reading array data. When the system
drives the RESET# pin low for at least a period of t
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 ma-
chine to reading array data. The operation that was in-
terrupted 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 V
the TTL standby mode; if RESET# is held at V
0.5 V, the device enters the CMOS standby mode.
The RESET# pin may be tied to the system reset cir-
cuitry. A system reset would thus also reset the Flash
memory, enabling the system to read the boot-up firm-
ware from the Flash memory.
Refer to the AC Characteristics tables for RESET# pa-
rameters and timing diagram.
Output Disable Mode
When the OE# input is at V
disabled. The output pins are placed in the high imped-
ance state.
Sector Size
(Kbytes)
64
64
64
32
16
8
8
IH
, output from the device is
(in hexadecimal)
3A000h–3BFFFh
3C000h–3FFFFh
00000h–0FFFFh
10000h–1FFFFh
20000h–2FFFFh
Address Range
30000h–37FFFh
38000h–39FFFh
IL
, the device enters
SS
RP
±
,