HY27US08281A Hynix Semiconductor, HY27US08281A Datasheet - Page 15

• Manufacturer Part Number: HY27US08281A
• Description: 128mbit 16mx8bit / 8mx16bit Nand Flash Memory
• Manufacturer: Hynix Semiconductor

2) Unlock
3) Lock-tight
4) Lock Block Boundaries after Unlock Command issuing
- If Start Block address = 0000h and End Block Address = FFFFh , the device is all unlocked
- If Start Block address = End Block Address = FFFFh , the device is all locked except for the last Block
- If Start Block address = End Block Address = 0000h , the device is all locked except for the first Block
2. Block lock Status Read
Block Lock Status can be read on a block basis to find out whether designated block is available to be programmed or
erased. After writing 7Ah command to the command register and block address to be checked, a read cycle outputs
the content of the Block Lock Status Register to the I/O pins on the falling edge of CE# or RE#, whichever occurs last.
RE# or CE# does not need to be toggled for updated status. Block Lock Status Read is prohibited while the device is
busy state.
Refer to table 16 for specific Status Register definitions. The command register remains in Block Lock Status Read
mode until further commands are issued to it.
In high state of PRE pin, write protection status can be checked by Block Lock Status Read (7Ah) while
in low state by Status Read (70h).
4.4 Power-On Auto-Read
The device is designed to offer automatic reading of the first page without command and address input sequence dur-
ing power-on.
An internal voltage detector enables auto-page read functions when Vcc reaches about 1.8V. PRE pin controls activa-
tion of auto- page read function. Auto-page read function is enabled only when PRE pin is logic high state. Serial
access may be done after power-on without latency. Power-On Auto Read mode is available only on 3.3V device.
Rev 0.6 / Nov. 2005
- Command Sequence: Unlock block Command (23h) + Start block address + Command (24h) + End block address.
- Unlocked blocks can be programmed or erased.
- An unlocked block’s status can be changed to the locked or lock-tighten state using the appropriate sequence of
- Only one consecutive area can be released to unlock state from lock state; Unlocking multi area is not available.
- Start block address must be nearer to the logical LSB (Least Significant Bit) than End block address.
- One block is selected for unlocking block when Start block address is same as End block address.
- Command Sequence: Lock-tight block Command (2Ch). See Fig. 20.
- Lock-tighten blocks offer the user an additional level of write protection beyond that of a regular lock block. A block
- Only locked blocks can be lock-tighten by lock-tight command.
- On the program or erase operation in Locked or Lock-tighten block, Busy state holds 1~10us(tLBSY)
See Fig. 19.
commands.
that is lock-tighten can’t have its state changed by software control, only by hardware control (WP# low pulse
input); Unlocking multi area is not available
128Mbit (16Mx8bit / 8Mx16bit) NAND Flash
HY27US(08/16)281A Series
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