HY29DS162 Datasheet, PDF (3/48 Pages) Hynix Semiconductor – 16 Megabit (2M x 8/1M x 16) Super-Low Voltage, Dual Bank, Simultaneous Read/Write, Flash Memory

mand. Reading data out of the device is similar to
reading from other Flash or EPROM devices.
The Secured Sector is an extra 64 KByte sector
capable of being permanently locked at the fac-
tory or by customers. The Secured Indicator Bit
(accessed via the Electronic ID mode) is perma-
nently set to a 1 if the part is factory locked, and
permanently set to a 0 if customer lockable. This
way, customer lockable parts can never be used
to replace a factory locked part. Factory locked
parts provide several options. The Secured Sec-
tor may store a secure, random 16-byte ESN (Elec-
tronic Serial Number), customer code programmed
at the factory, or both. Customer Lockable parts
may utilize the Secured Sector as bonus space,
reading and writing like any other Flash sector, or
may permanently lock their own code there.
The WP#/ACC pin provides access to two func-
tions. The Write Protect function provides a hard-
ware method of protecting certain boot sectors
without using a high voltage. The Accelerate func-
tion speeds up programming operations, and is
intended primarily to allow faster manufacturing
throughput.
HY29DS162/HY29DS163
Two power-saving features are embodied in the
HY29DS16x. When addresses have been stable
for a specified amount of time, the device enters
the automatic sleep mode. The host can also place
the device into the standby mode. Power con-
sumption is greatly reduced in both these modes.
Common Flash Memory Interface (CFI)
To make Flash memories interchangeable and to
encourage adoption of new Flash technologies,
major Flash memory suppliers developed a flex-
ible method of identifying Flash memory sizes and
configurations in which all necessary Flash device
parameters are stored directly on the device.
Parameters stored include memory size, byte/word
configuration, sector configuration, necessary volt-
ages and timing information. This allows one set
of software drivers to identify and use a variety of
different, current and future Flash products. The
standard which details the software interface nec-
essary to access the device to identify it and to
determine its characteristics is the Common Flash
Memory Interface (CFI) Specification. The
HY29DS16x is fully compliant with this specification.
BLOCK DIAGRAM
A[19:0], A[-1]
WE#
CE#
OE#
RESET#
BYTE#
RY/BY#
WP#/ACC
STATE
CONTROL
COMMAND
REGISTER
CFI
CONTROL
CFI DATA
MEMORY
ERASE VOLTAGE
GENERATOR AND
SECTOR SWITCHES
I/O CONTROL
PROGRAM
VOLTAGE
GENERATOR
Y-DECODER
TIMER
V_CC
DETECTOR
A[19:0], A[-1]
X-DECODER
DQ[15:0]
I/O BUFFERS
DATA LATCH
Y-GATING
16 Mb FLASH
MEMORY
ARRAY
(2 Banks,
39 Sectors)
0.5 Mb FLASH
Security Sector
r1.3/Apr 01
3