HY27US08121M Datasheet, PDF (12/43 Pages) Hynix Semiconductor – 512Mbit (64Mx8bit / 32Mx16bit) NAND Flash

HY27SS(08/16)121M Series
HY27US(08/16)121M Series
512Mbit (64Mx8bit / 32Mx16bit) NAND Flash
COMMAND SET
All bus write operations to the device are interpreted by the Command Interface. The Commands are input on I/O₀-I/
O₇ and are latched on the rising edge of Write Enable when the Command Latch Enable signal is high. Device opera-
tions are selected by writing specific commands to the Command Register. The two-step command sequences for pro-
gram and erase operations are imposed to maximize data security.
The Commands are summarized in Table 5, Commands.
Table 5: Command Set
FUNCTION
READ A
READ B
READ C
READ ELECTRINIC SIGNATURE
READ STATUS REGISTER
PAGE PROGRAM
COPY BACK PROGRAM
BLOCK ERASE
RESET
1st CYCLE
00h
01h
50h
90h
70h
80h
00h
60h
FFh
2nd CYCLE
-
-
-
-
-
10h
8Ah
D0h
-
3rd CYCLE
-
-
-
-
-
-
10h
-
-
Command accepted during busy
Yes
Yes
Note: (1). Any undefined command sequence will be ignored by the device.
(2). Bus Write Operation(1^st, 2^nd and 3^rd Cycle) : The bus cycles are only shown for issuing the codes. The cycles required to
input the addresses or input/output data are not shown.
DEVICE OPERATIONS
Pointer Operations
As the NAND Flash memories contain two different areas for x16 devices and three different areas for x8 devices (see
Figure 8) the read command codes (00h, 01h, 50h) are used to act as pointers to the different areas of the memory
array (they select the most significant column address).
The Read A and Read B commands act as pointers to the main memory area. Their use depends on the bus width of
the device.
- In x16 devices the Read A command (00h) sets the pointer to Area A (the whole of the main area) that is Words 0
to 255.
- In x8 devices the Read A command (00h) sets the pointer to Area A (the first half of the main area) that is Bytes 0
to 255, and the Read B command (01h) sets the pointer to Area B (the second half of the main area) that is Bytes 256
to 511.
In both the x8 and x16 devices the Read C command (50h), acts as a pointer to Area C (the spare memory area) that
is Bytes 512 to 527 or Words 256 to 263.
Once the Read A and Read C commands have been issued the pointer remains in the respective areas until another
Rev 0.6 / Oct. 2004
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