Sharp LC-22LE240E, Service Manual

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42
LC-22LE240
11. NAND FLASH MEMORY – NAND512XXA2C (U162)
11.1. General Description
The NAND flash 528-byte/ 264-word page is a family of non-volatile flash memories that
uses the single level cell (SLC) NAND technology. It is referred to as the small page
family.
The NAND512R3A2C, NAND512R4A2C, and NAND512W3A2C have a density of 512
Mbits and operate with either a 1.8 V or 3 V voltage supply. The size of a page is either
528 bytes (512 + 16 spare) or 264 words (256 + 8 spare) depending on whether the
device has a x8 or x16 bus width.
The address lines are multiplexed with the Data Input/Output signals on a multiplexed x8
or x16 input/output bus. This interface reduces the pin count and makes it possible to
migrate to other densities without changing the footprint.
To extend the lifetime of NAND flash devices it is strongly recommended to implement an
error correction code (ECC). The use of ECC correction allows to achieve up to 100,000
program/erase cycles for each block. A write protect pin is available to give a hardware
protection against program and erase operations.
11.2. Features
 High density NAND flash memories
o 512-Mbit memory array
o Cost effective solutions for mass storage applications
 NAND interface
o
x8 or x16 bus width
o Multiplexed address/ data
 Supply voltage: 1.8 V, 3 V
 Page size
o x8 device: (512 + 16 spare) bytes
o x16 device: (256 + 8 spare) words
 Block size
o x8 device: (16K + 512 spare) bytes
o x16 device: (8K + 256 spare) words
 Page read/program
o Random access: 12 μs (3 V)/15 μs (1.8 V) (max)
o
Sequential access: 30 ns (3 V)/50 ns (1.8 V) (min)
o
Page program time: 200 μs (typ)
 Copy back program mode
 Fast block erase: 2 ms (typ)