JMicron

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JMicron Technology Corporation
智微科技
Type Public
Traded as GTSM: 4925
Industry Semiconductors
Founded September 2001
Headquarters Hsinchu, Taiwan
Key people MK Tsai (Chairman)
Tim Liu (CEO)
Products Integrated circuits, SSD Controllers, Bridge Controllers
Website www.jmicron.com

JMicron Technology Corporation (Chinese: 智微科技; pinyin: Zhìwēi Kējì) is a Taiwanese fabless technology design house based in Hsinchu, Taiwan. As a manufacturer of integrated circuits, they produce controller chips for solid state drives (SSDs) and bridge devices.[1]

History[edit]

2001-2007[edit]

The company was founded in September of 2001 and its headquarters is in Hsinchu, Taiwan. The company also operates an advanced R&D center based out of Irvine, California.

JMicron begins developing SSD technology in 2006, launching their first generation SSD controller, the JMF601A/602A, towards the end of 2007.

JMicron's SSD controller is widely adopted by many SSD manufacturers such ASUS Eee PC, Corsair,[2] OCZ, and Transcend. JMicron was one of the first[3] companies to provide an SSD controller chip to these companies, allowing them to produce reasonably priced MLC SSDs.

2008 to Present[edit]

In early 2008, a write latency issue is discovered with the JMF601A/602A that occurs when system data is nearly full and the host continues to write data. Soon after, the company released the JMF601B/602B to address the write latency problem.[4]

In 2009, the JMF612 is released, and sees popularity throughout 2010 in its use in a number of industry SSDs.[5] Then, in late 2011, the JMF661 is released as a third generation JMicron SSD controller, and is shown to be an effective entry-level product. Shortly thereafter, in 2013, the JMF667 series is released as a 256 GB capacity, 512 MB DDR3 external cache SSD controller.[6]

In June 2014, JMicron announced the JMF670 and JMF670H. Both are 4-channel SATA SSD controllers capable of supporting up to 512 GB of storage capacity. Production was to begin in July 2014. In a similar announcement, they showcased the JMF810 and JMF811, which are PCIe Gen II 2- and 4-lane SSD controllers, respectively. These controllers are designed for speeds of up to 1.5 GB/s in sequential read and 1.2 GB/s in sequential write. Another announcement was the JMS577, which is a USB 3.0 to SATA 6 Gb/s bridge controller. The company also showcased their USB 3.1 technology, which is expected to achieve data transmission speeds of 10 Gb/s—doubling the speed of the previous USB Gen III controller.[7]

Throughout 2014, JMicron's JMF667H was reviewed by a number of online review sites like Tom's Hardware, AnandTech, and TweakTown.

Products[edit]

SSD Controllers[edit]

Client [8]

  • JMF661: A 16-CE, 4-channel model supporting external DDR2 DRAM, SATA III to flash interface (product is no longer supported).
  • JMF667: A single-CE, 4-channel model supporting external DDR3 DRAM, SATA III to flash interface.
  • JMF667H: An 8-CE, 4-channel model supporting external DDR3 DRAM, SATA III to flash interface.

Embedded [9]

  • JMF605: 16-CE, 4-channel SATA II to flash interface (product is no longer supported).
  • JMF606: 4-CE, 4-channel SATA III to flash interface with hardware accelerator.
  • JMF607: 4-CE, 2-channel SATA III to flash interface with hardware accelerator.
  • JMF608: 4-CE, 4-channel SATA III flash controller with ONFI 3.0 and Toggle 2.0 technology to support high performance.
  • JMF609: 4-CE, 2-channel SATA III flash controller with ONFI 3.0 and Toggle 2.0 technology to support high performance.

Bridge Controllers[edit]

USB 3.0[10]

  • JMS561: USB 3.0 to Dual SATA III with RAID
  • JMS561U: USB 3.0 to Dual SATA III with CLONE
  • JMS562: USB 3.0 & eSATA III to Dual SATA III with RAID
  • JMS567: USB 3.0 to SATA III 6 GB/s, 3.3 Vcc
  • JMS568: USB 3.0 to SATA III 6 GB/s, 2.5 Vcc

USB 2.0[11]

  • JMB352: USB 2.0 & SATA II to Dual SATA II with RAID
  • JMB352U: USB 2.0 & SATA II to Dual SATA II Port Multiplier
  • JMB355: USB 2.0 & eSATA & 1394A/B to SATA II
  • JM20329: USB 2.0 to SATA (mask ROM)
  • JM20337: USB 2.0 to SATA & PATA

SATA to PATA bi-directional[12]

  • JMD330: Serial ATA (SATA to PATA)
  • JMH330/S: Serial ATA (PATA to SATA)

Port Multiplier/Selector and RAID[13]

  • JMB320: 1 to 2-port Serial ATA II Port Multiplier or 2 to 1-port Serial ATA II Port Selector
  • JMB321: 1 to 5-port Serial ATA II Port Multiplier or 5 to 1-port Serial ATA II Port Selector
  • JMB390: 1 to 2-port Serial ATA II Port Multiplier & RAID-0/1/10 Controller
  • JMB393: 1 to 5-port Serial ATA II RAID-5 Controller
  • JMB394: 1 to 5-port Serial ATA II RAID-5 Controller with LCM interfaces
  • JMB572: 1 to 2-port Serial ATA III Port Multiplier or 2 to 1-port Serial ATA III Port Selector
  • JMB575: 1 to 5-port Serial ATA III Port Multiplier or 5 to 1-port Serial ATA III Port Selector

Market Reception[edit]

When flash controllers were first offered to SSD manufacturers in 2008, JMicron's early JMF601 and JMF602 models were reported to have issues with write latency, causing a stuttering problem.[14][15] The performance problem was attributed to the small buffer size used in the controller.[16] After several corrective releases, JMicron released the JMF667H, which to date has received generally positive reviews, being cited as both competitive and budget-friendly[17] when used with the correct type of NAND.[18] For instance, when paired with Toshiba's A19 NAND, the JMF667H has been shown to be capable of achieving the following metrics: 500 MB/s for 128 KB sequential read, 450 MB/s for 128 KB sequential write, and reaching 80,000 4 KB IOPS for both random read and write.[19] The JMF667H has also been found to have very low power consumption, with active idle power consumption in the 0.2-0.4 W range depending on the capacity of the controller, as well as an average power consumption rating of 0.36-0.78 W when examined in PCMark 7.[20] Certain drives driven by the JMF667H controller, such as the Kingfast C-Drive F8, have achieved high scores on independent review sites—for example, 90% on TweakTown.[21]

See also[edit]

References[edit]

External links[edit]


Category:Electronics companies of Taiwan