HY29LV320 Datasheet, PDF (6/44 Pages) Hynix Semiconductor – 32 Mbit (2M x 16) Low Voltage Flash Memory

HY29LV320
CONVENTIONS
Unless otherwise noted, a positive logic (active
High) convention is assumed throughout this docu-
ment, whereby the presence at a pin of a higher,
more positive voltage (V_IH) causes assertion of the
signal. A ‘#’ symbol following the signal name,
e.g., RESET#, indicates that the signal is asserted
in the Low state (V_IL). See DC specifications for
V_IH and V_IL values.
MEMORY ARRAY ORGANIZATION
The 32 Mbit Flash memory array is organized into
67 blocks called sectors (S0, S1, . . . , S66). A
sector or several contiguous sectors are defined
as a sector group. A sector is the smallest unit
that can be erased and a sector group is the small-
est unit that can be protected to prevent acciden-
tal or unauthorized erasure.
In the HY29LV320, four of the sectors, which com-
prise the boot block, are sized as follows: one of
eight Kwords, two of four Kwords and one of
sixteen Kwords. The remaining 63 sectors are
sized at 32 Kwords. The boot block can be lo-
cated at the bottom of the address range
(HY29LV320B) or at the top of the address range
(HY29LV320T).
Tables 1 and 2 define the sector addresses and
corresponding array address ranges for the top
and bottom boot block versions of the HY29LV320.
See Tables 6 and 7 for sector group definitions.
Secured Sector Flash Memory Region
The Secured Sector (Sec²) feature provides a 128
word Flash memory region that enables perma-
nent part identification through an Electronic Se-
rial Number (ESN). An associated ‘Sec² Indica-
tor’ bit, which is permanently set at the factory and
cannot be changed, indicates whether or not the
Sec² is locked when shipped from the factory.
The device is offered with the Sec² either factory
locked or customer lockable. The factory-locked
version is always protected when shipped from
the factory, and has the Sec² Indicator bit perma-
nently set to a ‘1’. The customer-lockable version
is shipped with the Sec² unprotected, allowing
customers to utilize the sector in any manner they
choose, and has the Sec² Indicator bit permanently
set to a ‘0’. Thus, the Sec² Indicator bit prevents
Whenever a signal is separated into numbered
bits, e.g., DQ[7], DQ[6], ..., DQ[0], the family of
bits may also be shown collectively, e.g., as
DQ[7:0].
The designation 0xNNNN (N = 0, 1, 2, . . . , 9, A, .
. . , E, F) indicates a number expressed in hexadeci-
mal notation. The designation 0bXXXX indicates a
number expressed in binary notation (X = 0, 1).
customer-lockable devices from being used to re-
place devices that are factory locked. The bit pre-
vents cloning of a factory locked part and thus
ensures the security of the ESN once the product
is shipped to the field.
The system accesses the Sec² through a com-
mand sequence (see “Enter/Exit Secured Sector
Command Sequence”). After the system has writ-
ten the Enter Secured Sector command sequence,
it may read the Sec² by using the addresses speci-
fied in Table 3. This mode of operation continues
until the system issues the Exit Secured Sector
command sequence, or until power is removed
from the device. On power-up, or following a hard-
ware reset, the device reverts to addressing the
Flash array.
Note: While in the Sec² Read mode, only the reading of
the ‘Replaced Sector’ (Table 3) is affected. Accesses
within the specified sector, but outside the address range
specified in the table, may produce indeterminate results.
Reading of all other sectors in the device continues nor-
mally while in this mode.
Sec² Programmed and Protected At the Factory
In a factory-locked device, the Sec² is protected
when the device is shipped from the factory and
cannot be modified in any way. The device is avail-
able preprogrammed with one of the following:
n A random, secure ESN only
n Customer code
n Both a random, secure ESN and customer
code
In devices that have an ESN, it will be located at
the bottom of the sector: starting at word address
0x000000 and ending at 0x000007 for a Bottom
Boot device, and starting at word address
0x1FE000 and ending at 0x1FE007 for a Top Boot
device. See Table 3.
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r1.3/May 02