HY29F400A Datasheet, PDF (5/40 Pages) Hynix Semiconductor – 4 Megabit (512Kx8/256Kx16) 5 Volt-only Flash Memory

MEMORY ARRAY ORGANIZATION
The 4 Mbit Flash memory array is organized into
11 blocks called sectors (S0, S1, . . . , S10). A
sector is the smallest unit that can be erased and
which can be protected to prevent accidental or
unauthorized erasure. See the ‘Bus Operations’
and ‘Command Definitions’ sections of this docu-
ment for additional information on these functions.
In the HY29F400A, four of the sectors, which com-
prise the boot block, vary in size from 8 to 32
Kbytes (4 to 16 Kwords), while the remaining
seven sectors are uniformly sized at 64 Kbytes
(32 Kwords). The boot block can be located at
the bottom of the address range (HY29F400AB)
or at the top of the address range (HY29F400AT).
HY29F400A
Table 1 defines the sector addresses and corre-
sponding address ranges for the top and bottom
boot block versions of the HY29F400A.
BUS OPERATIONS
Device bus operations are initiated through the
internal command register, which consists of sets
of latches that store the commands, along with
the address and data information, if any, needed
to execute the specific command. The command
register itself does not occupy any addressable
memory location. The contents of the command
register serve as inputs to an internal state ma-
chine whose outputs control the operation of the
device. Table 2 lists the normal bus operations,
Table 1. HY29F400A Memory Array Organization
Device
Sector
Size
(KB/KW)
Sector Address
A[17] A[16] A[15] A[14] A[13] A[12]
Byte Mode
Address Range ²
S0 64/32 0 0 0 X X X 0x00000 - 0x0FFFF
S1 64/32 0 0 1 X X X 0x10000 - 0x1FFFF
S2 64/32 0 1 0 X X X 0x20000 - 0x2FFFF
S3 64/32 0 1 1 X X X 0x30000 - 0x3FFFF
S4 64/32 1 0 0 X X X 0x40000 - 0x4FFFF
S5 64/32 1 0 1 X X X 0x50000 - 0x5FFFF
S6 64/32 1 1 0 X X X 0x60000 - 0x6FFFF
S7 32/16 1 1 1 0 X X 0x70000 - 0x77FFF
S8
8/4
1 1 1 1 0 0 0x78000 - 0x79FFF
S9
8/4
1 1 1 1 0 1 0x7A000 - 0x7BFFF
S10 16/8 1 1 1 1 1 X 0x7C000 - 0x7FFFF
S0 16/8 0 0 0 0 0 X 0x00000 - 0x03FFF
S1
8/4
0 0 0 0 1 0 0x04000 - 0x05FFF
S2
8/4
0 0 0 0 1 1 0x06000 - 0x07FFF
S3 32/16 0 0 0 1 X X 0x08000 - 0x0FFFF
S4 64/32 0 0 1 X X X 0x10000 - 0x1FFFF
S5 64/32 0 1 0 X X X 0x20000 - 0x2FFFF
S6 64/32 0 1 1 X X X 0x30000 - 0x3FFFF
S7 64/32 1 0 0 X X X 0x40000 - 0x4FFFF
S8 64/32 1 0 1 X X X 0x50000 - 0x5FFFF
S9 64/32 1 1 0 X X X 0x60000 - 0x6FFFF
S10 64/32 1 1 1 X X X 0x70000 - 0x7FFFF
Notes:
1. X indicates Don’t Care.
2. Address in Byte Mode is A[17:-1].
3. Address in Word Mode is A[17:0].
Rev. 1.0/Jan. 02
Word Mode
Address Range ³
0x00000 - 0x07FFF
0x08000 - 0x0FFFF
0x10000 - 0x17FFF
0x18000 - 0x1FFFF
0x20000 - 0x27FFF
0x28000 - 0x2FFFF
0x30000 - 0x37FFF
0x38000 - 0x3BFFF
0x3C000 - 0x3CFFF
0x3D000 - 0x3DFFF
0x3E000 - 0x3FFFF
0x00000 - 0x01FFF
0x02000 - 0x02FFF
0x03000 - 0x03FFF
0x04000 - 0x07FFF
0x08000 - 0x0FFFF
0x10000 - 0x17FFF
0x18000 - 0x1FFFF
0x20000 - 0x27FFF
0x28000 - 0x2FFFF
0x30000 - 0x37FFF
0x38000 - 0x3FFFF
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