Memory(H9Da1Gh25Hbmmmr, U100 ) - LG A395 Service Manual

3.6 MEMORY(H9DA1GH25HBMMMR, U100 )

3.6 MEMORY(H9DA1GH25HBMMMR, U100 )
3.6.1 Functional Description
3.6.1 Functional Description
SK hynix NAND Flash is offered in 1.8 Vcc and VccQ Power Supply, and with x16 I/O interface. Its NAND cell
provides the most cost-effective solution for the solid state mass storage market. The memory is divided
into blocks that can be erased independently so it is possible to preserve valid data while old data is
erased. The Depending on whether the devices have a x8 or x16 bus width, the page size is (1024+32
spare) words.
Each block can be programmed and erased up to 50,000 cycles with ECC (error correction code) on. To
extend the lifetime of Nand Flash devices, the implementation of an ECC is mandatory.
The chip supports CE# don't care function. This function allows the direct download of the code from the
NAND Flash memory device by a microcontroller, since the CE# transitions do not stop the read operation.
In addition, device supports ONFI 1.0 specification. The copy back function allows the optimization of
defective blocks management: when a page program operation fails the data can be directly
programmed in another page inside the same array section without the time consuming serial data
insertion phase. We don't have EDC function in this device.
A write protect pin is available to provide hardware protection against program and erase operations. The
devices feature an open-drain ready/busy output that identifies if the program/erase/read controller is
currently active. The use of an open-drain output allows the ready/busy pins from several memories to
connect to a single pullup resistor.
The devices have a cache read feature that improves the read throughput for large files. During cache
reading, the devices loads the data in a cache register while the previous data is transferred to the I/O
buffers to be read. This feature is implemented according to ONFI 1.0 specification.
LGE Internal Use Only
LGE Internal Use Only
3. TECHNICAL BRIEF
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3. TECHNICAL BRIEF
Only for training and service purposes