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PDF A29L800C Data sheet ( Hoja de datos )
| Número de pieza | A29L800C | |
| Descripción | Boot Sector Flash Memory | |
| Fabricantes | AMIC | |
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Preliminary
A29L800C Series
1M X 8 Bit / 512K X 16 Bit CMOS 3.0 Volt-only,
Boot Sector Flash Memory
Document Title
1M X 8 Bit / 512K X 16 Bit CMOS 3.0 Volt-only, Boot Sector Flash Memory
Revision History
Rev. No. History
0.0 Initial issue
Issue Date
August 24, 2016
Remark
Preliminary
PRELIMINARY (August, 2016, Version 0.0)
AMIC Technology, Corp.
AMIC reserves the right to change products and specifications discussed herein without notice.
1 page  
Block Diagram
VCC
VSS
RY/BY
RESET
WE
BYTE
CE
OE
State
Control
Command
Register
A0-A18
VCC Detector
Sector Switches
Erase Voltage
Generator
A29L800C Series
I/O0 - I/O15 (A-1)
Input/Output
Buffers
PGM Voltage
Generator
Chip Enable
Output Enable
Logic
STB Data Latch
Timer
STB Y-Decoder
X-decoder
Y-Gating
Cell Matrix
Pin Descriptions
Pin No.
A0 - A18
I/O0 - I/O14
I/O15 (A-1)
I/O15
A-1
CE
WE
OE
RESET
BYTE
RY/ BY
VSS
VCC
NC
Description
Address Inputs
Data Inputs/Outputs
Data Input/Output, Word Mode
LSB Address Input, Byte Mode
Chip Enable
Write Enable
Output Enable
Hardware Reset
Selects Byte Mode or Word Mode
Ready/ BUSY - Output
Ground
Power Supply
Pin not connected internally
PRELIMINARY (August, 2016, Version 0.0)
4
AMIC Technology, Corp.
5 Page 
A29L800C Series
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 protected sectors.
It is possible to determine whether a sector is protected or
unprotected. See “Autoselect Mode” for details.
Sector protection / unprotection can be implemented 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 2 shows the algorithm and
the Sector Protect / Unprotect Timing Diagram illustrates the
timing waveforms for this feature. This method uses standard
microprocessor bus cycle timing. For sector unprotect, all
unprotected sectors must first be protected prior to the first
sector unprotect write cycle. The alternate method must be
implemented using programming equipment. The procedure
requires a high voltage (VID) on address pin A9 and the
control pins.
The device is shipped with all sectors unprotected.
It is possible to determine whether a sector is protected or
unprotected. See "Autoselect Mode" for details.
Hardware Data Protection
The requirement of command unlocking sequence for
programming or erasing provides data protection against
inadvertent writes (refer to the Command Definitions table).
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 transitions, or from system noise. The device
is powered up to read array data to avoid accidentally writing
data to the array.
Write Pulse "Glitch" Protection
Noise pulses of less than 5ns (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 a logical zero while OE is a logical one.
Power-Up Write Inhibit
If WE = CE = VIL and OE = VIH during power up, the
device does not accept commands on the rising edge of
WE . The internal state machine is automatically reset to
reading array data on the initial power-up.
Temporary Sector Unprotect
This feature allows temporary unprotection of previous
protected sectors to change data in-system. The Sector
Unprotect mode is activated by setting the RESET 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 RESET pin, all the previously
protected sectors are protected again. Figure 1 shows the
algorithm, 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:
1. All protected sectors unprotected.
2. All previously protected sectors are protected once again.
Figure 1. Temporary Sector Unprotect Operation
PRELIMINARY (August, 2016, Version 0.0)
10
AMIC Technology, Corp.
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet A29L800C.PDF ] | |
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