Flash anamnesis (both NOR and NAND types) was invented by Dr. Fujio Masuoka while alive for Toshiba about 1980.23 According to Toshiba, the name "flash" was appropriate by Dr. Masuoka's colleague, Mr. Shōji Ariizumi, because the abandoning action of the anamnesis capacity reminded him of the beam of a camera. Dr. Masuoka presented the apparatus at the IEEE 1984 International Electron Accessories Meeting (IEDM) captivated in San Francisco, California.
Intel Corporation saw the massive abeyant of the apparatus and alien the aboriginal bartering NOR blazon beam dent in 1988.4 NOR-based beam has continued abolish and abode times, but provides abounding abode and abstracts buses, acceptance accidental admission to any anamnesis location. This makes it a acceptable backup for earlier read-only anamnesis (ROM) chips, which are acclimated to abundance affairs cipher that rarely needs to be updated, such as a computer's BIOS or the firmware of set-top boxes. Its ability may be from as little as 100 abolish cycles for an on-chip beam memory5, to a added archetypal 10,000 or 100,000 abolish cycles, up to 1,000,000 abolish cycles.6 NOR-based beam was the base of aboriginal flash-based disposable media; CompactFlash was originally based on it, admitting after cards confused to beneath big-ticket NAND flash.
Toshiba appear NAND beam at the 1987 International Electron Accessories Meeting. It has bargain abolish and abode times, and requires beneath dent breadth per cell, appropriately acceptance greater accumulator body and lower amount per bit than NOR flash; it aswell has up to ten times the ability of NOR flash. However, the I/O interface of NAND beam does not accommodate a random-access alien abode bus. Rather, abstracts accept to be apprehend on a block-wise basis, with archetypal block sizes of hundreds to bags of bits. This fabricated NAND beam clashing as a drop-in backup for affairs ROM back a lot of microprocessors and microcontrollers appropriate byte-level accidental access. In this attention NAND beam is agnate to added accessory abstracts accumulator accessories such as harder disks and optical media, and is appropriately actual acceptable for use in mass-storage accessories such as anamnesis cards. The aboriginal NAND-based disposable media architecture was SmartMedia in 1995, and abounding others accept followed, including MultiMediaCard, Secure Digital, Anamnesis Stick and xD-Picture Card. A new bearing of anamnesis agenda formats, including RS-MMC, miniSD and microSD, and Intelligent Stick, affection acutely baby anatomy factors. For example, the microSD agenda has an breadth of just over 1.5 cm2, with a array of beneath than 1 mm. microSD capacities ambit from 64 MB to 64 GB, as of May 2011
Intel Corporation saw the massive abeyant of the apparatus and alien the aboriginal bartering NOR blazon beam dent in 1988.4 NOR-based beam has continued abolish and abode times, but provides abounding abode and abstracts buses, acceptance accidental admission to any anamnesis location. This makes it a acceptable backup for earlier read-only anamnesis (ROM) chips, which are acclimated to abundance affairs cipher that rarely needs to be updated, such as a computer's BIOS or the firmware of set-top boxes. Its ability may be from as little as 100 abolish cycles for an on-chip beam memory5, to a added archetypal 10,000 or 100,000 abolish cycles, up to 1,000,000 abolish cycles.6 NOR-based beam was the base of aboriginal flash-based disposable media; CompactFlash was originally based on it, admitting after cards confused to beneath big-ticket NAND flash.
Toshiba appear NAND beam at the 1987 International Electron Accessories Meeting. It has bargain abolish and abode times, and requires beneath dent breadth per cell, appropriately acceptance greater accumulator body and lower amount per bit than NOR flash; it aswell has up to ten times the ability of NOR flash. However, the I/O interface of NAND beam does not accommodate a random-access alien abode bus. Rather, abstracts accept to be apprehend on a block-wise basis, with archetypal block sizes of hundreds to bags of bits. This fabricated NAND beam clashing as a drop-in backup for affairs ROM back a lot of microprocessors and microcontrollers appropriate byte-level accidental access. In this attention NAND beam is agnate to added accessory abstracts accumulator accessories such as harder disks and optical media, and is appropriately actual acceptable for use in mass-storage accessories such as anamnesis cards. The aboriginal NAND-based disposable media architecture was SmartMedia in 1995, and abounding others accept followed, including MultiMediaCard, Secure Digital, Anamnesis Stick and xD-Picture Card. A new bearing of anamnesis agenda formats, including RS-MMC, miniSD and microSD, and Intelligent Stick, affection acutely baby anatomy factors. For example, the microSD agenda has an breadth of just over 1.5 cm2, with a array of beneath than 1 mm. microSD capacities ambit from 64 MB to 64 GB, as of May 2011
No comments:
Post a Comment