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PDF AM29F800B Data sheet ( Hoja de datos )
| Número de pieza | AM29F800B | |
| Descripción | 8 Megabit (1 M x 8-Bit/512 K x 16-Bit) CMOS 5.0 Volt-only/ Boot Sector Flash Memory | |
| Fabricantes | AMD | |
| Logotipo |  |
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PRELIMINARY
Am29F800B
8 Megabit (1 M x 8-Bit/512 K x 16-Bit)
CMOS 5.0 Volt-only, Boot Sector Flash Memory
DISTINCTIVE CHARACTERISTICS
s Single power supply operation
— 5.0 Volt-only operation for read, erase, and
program operations
— Minimizes system level requirements
s Manufactured on 0.35 µm process technology
— Compatible with 0.5 µm Am29F800 device
s High performance
— Access times as fast as 55 ns
s Low power consumption (typical values at 5
MHz)
— 1 µA standby mode current
— 20 mA read current (byte mode)
— 28 mA read current (word mode)
— 30 mA program/erase current
s Flexible sector architecture
— One 16 Kbyte, two 8 Kbyte, one 32 Kbyte, and
fifteen 64 Kbyte sectors (byte mode)
— One 8 Kword, two 4 Kword, one 16 Kword, and
fifteen 32 Kword sectors (word mode)
— Supports full chip erase
— Sector Protection features:
A hardware method of locking a sector to
prevent any program or erase operations within
that sector
Sectors can be locked via programming
equipment
Temporary Sector Unprotect feature allows code
changes in previously locked sectors
s Top or bottom boot block configurations
available
s Embedded Algorithms
— Embedded Erase algorithm automatically
preprograms and erases the entire chip or any
combination of designated sectors
— Embedded Program algorithm automatically
writes and verifies data at specified addresses
s Minimum 1,000,000 program/erase cycles per
sector guaranteed
s Package option
— 48-pin TSOP
— 44-pin SO
s Compatibility with JEDEC standards
— Pinout and software compatible with single-
power-supply Flash
— Superior inadvertent write protection
s Data# Polling and toggle bits
— Provides a software method of detecting
program or erase operation completion
s Ready/Busy# pin (RY/BY#)
— Provides a hardware method of detecting
program or erase cycle completion
s Erase Suspend/Erase Resume
— Suspends an erase operation to read data from,
or program data to, a sector that is not being
erased, then resumes the erase operation
s Hardware reset pin (RESET#)
— Hardware method to reset the device to reading
array data
Publication# 21504 Rev: C Amendment/+1
Issue Date: April 1998
1 page  
CONNECTION DIAGRAMS
RY/BY# 1
A18 2
A17 3
A7 4
A6 5
A5 6
A4 7
A3 8
A2 9
A1 10
A0 11
CE# 12
VSS 13
OE# 14
DQ0 15
DQ8 16
DQ1 17
DQ9 18
DQ2 19
DQ10 20
DQ3 21
DQ11 22
PRELIMINARY
SO
44 RESET#
43 WE#
42 A8
41 A9
40 A10
39 A11
38 A12
37 A13
36 A14
35 A15
34 A16
33 BYTE#
32 VSS
31 DQ15/A-1
30 DQ7
29 DQ14
28 DQ6
27 DQ13
26 DQ5
25 DQ12
24 DQ4
23 VCC
PIN CONFIGURATION
A0–A18 = 19 addresses
DQ0–DQ14 = 15 data inputs/outputs
DQ15/A-1 = DQ15 (data input/output, word mode),
A-1 (LSB address input, byte mode)
BYTE# = Selects 8-bit or 16-bit mode
CE#
= Chip enable
OE#
= Output enable
WE#
= Write 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
21504C-3
LOGIC SYMBOL
19
A0–A18
16 or 8
DQ0–DQ15
(A-1)
CE#
OE#
WE#
RESET#
BYTE#
RY/BY#
21504C-4
Am29F800B
5
5 Page 
PRELIMINARY
Table 4. Am29F800B Autoselect Codes (High Voltage Method)
Description
A18 A11
A8
A5
DQ8
to to to to
to
Mode CE# OE# WE# A12 A10 A9 A7 A6 A2 A1 A0 DQ15
DQ7
to
DQ0
Manufacturer ID: AMD
L L H X X VID X L X L L X
Device ID:
Am29F800B
(Top Boot Block)
Word
Byte
L
L
LH
22h
X X VID X L X L H
LH
X
01h
D6h
D6h
Device ID:
Word L L H
22h
Am29F800B
X X VID X L X L H
(Bottom Boot Block) Byte L L H
X
58h
58h
Sector Protection Verification L
L H SA X VID X L X H L
X
01h
(protected)
X
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
hardware sector unprotection feature re-enables both
program and erase operations in previously pro-
tected sectors.
Sector protection/unprotection must be implemented
using programming equipment. The procedure re-
quires a high voltage (VID) on address pin A9 and the
control pins. Details on this method are provided in a
supplement, publication number 20374. Contact an
AMD representative to obtain a copy of the appropriate
document.
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
RESET# pin to VID. During this mode, formerly pro-
tected sectors can be programmed or erased by se-
lecting the sector addresses. Once VID is removed
from the RESET# pin, all the previously protected
sectors are protected again. Figure 1 shows the algo-
rithm, and the Temporary Sector Unprotect diagram
shows the timing waveforms, for this feature.
START
RESET# = VID
(Note 1)
Perform Erase or
Program Operations
RESET# = VIH
Temporary Sector
Unprotect
Completed (Note 2)
Notes:
21504C-5
1. All protected sectors unprotected.
2. All previously protected sectors are protected once
again.
Figure 1. Temporary Sector Unprotect Operation
Am29F800B
11
11 Page | ||
| Páginas | Total 39 Páginas | |
| PDF Descargar | [ Datasheet AM29F800B.PDF ] | |
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