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AM29F002NB-90EE Fiches technique(PDF) 8 Page - Advanced Micro Devices

No de pièce AM29F002NB-90EE
Description  2 Megabit (256 K x 8-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory
Download  37 Pages
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Fabricant  AMD [Advanced Micro Devices]
Site Internet  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM29F002NB-90EE Fiches technique(HTML) 8 Page - Advanced Micro Devices

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Am29F002/Am29F002N
PREL I M I N AR Y
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 VCC ± 0.5 V. (Note that this is a more re-
stricted voltage range than VIH.) The device enters the
TTL standby mode when CE# and RESET# pins (CE#
only on the Am29F002N) are both held at VIH. The de-
vice requires standard access time (tCE) for read ac-
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, ICC3 represents the
standby current specification.
If the device is deselected during erasure or program-
ming, the device draws active current until the
operation is completed.
ICC3 in the DC Characteristics tables represents the
standby current specification.
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 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 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 VIL, the device enters
the TTL standby mode; if RESET# is held at VSS ±
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 VIH, output from the device is
disabled. The output pins are placed in the high imped-
ance state.
Table 2.
Am29F002/Am29F002N Top Boot Block Sector Address Table
Sector
A17
A16
A15
A14
A13
Sector Size
(Kbytes)
Address Range
(in hexadecimal)
SA0
0
0
X
X
X
64
00000h–0FFFFh
SA1
0
1
X
X
X
64
10000h–1FFFFh
SA2
1
0
X
X
X
64
20000h–2FFFFh
SA3
1
1
0
X
X
32
30000h–37FFFh
SA4
1
1
1
0
0
8
38000h–39FFFh
SA5
1
1
1
0
1
8
3A000h–3BFFFh
SA6
1
1
1
1
X
16
3C000h–3FFFFh


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