Nostalgia buffs who lived through computing in the 1970s will enjoy some magnificent photos shared in a blog post by Ryszard Milewicz. These photos give three views of a ferrite core memory plane. The photo from this blog is a part of one of Mr. Milewicz’ close-up photos.
For those who were not exposed to core memory, this technology was based upon an approach in which every individual bit of a computer’s memory was a tiny donut made of compressed iron powder (“Ferrite”) that had to be hand strung with copper wire into a plane of bits.
A co-worker of The Memory Guy once had a high-speed core memory array that he used as Continue reading “Remembering Core Memory”
The IEEE Spectrum published an interesting article postulating that Russia’s recently-failed Mars probe may have suffered from bad memory chips. According to the Spectrum article the Russian government’s Official Accident Investigation Results faulted SRAMs:
The report blames the loss of the probe on memory chips that became fatally damaged by cosmic rays.
Both the main computer and the backup computer seem to have failed at the same time, Continue reading “IEEE Spectrum: Did Bad Memory Chips Down Russia’s Mars Probe?”
Today Intel divested itself of a portion of the assets of IMFT, the joint venture NAND flash manufacturing arm it shares with Micron Technology. This is an effort by Intel to groom the business to better suit Intel’s evolving vision of its role in the NAND flash business.
Objective Analysis issued an Alert to our clients giving the “What, When, Why, and Where” of this deal. The Alert can be downloaded for free from the Objective Analysis Reports page.
Elpida today filed for bankruptcy. The troubled DRAM manufacturer has been unprofitable for the past five quarters and was facing repayment requirements that the current market would prevent the company from meeting.
The company is the world’s third largest DRAM maker, and is the last remaining Japanese DRAM company. This is particularly stunning for DRAM industry veterans, since Japanese DRAM makers were at one time the largest in the world. NEC used to be the world’s largest semiconductor manufacturer based largely upon its DRAM revenues.
Objective Analysis has issued an Alert covering this news. It can be downloaded for free from the Objective Analysis Reports page.
One memory chip was so important that it was presented three times at this week’s International Solid State Circuits Conference (ISSCC) and that was the Toshiba/SanDisk 128Gb NAND flash. This chip was shown by Eli Harari in Monday’s keynote, then was featured twice in the Wednesday afternoon Nonvolatile Memories session – once by Toshiba and once by SanDisk.
The NAND chip, measuring 170.6mm², is said by both companies to be the densest NAND available. Compared to the Intel/Micron 64Gb 20nm NAND at 118mm², the device gives twice the bits in a 45% larger die area, so the companies’ claim rings true, since the only other NAND makers: Samsung and Hynix, have processes that fall far behind at 27nm and 26nm respectively.
Continue reading “Inside SanDisk’s & Toshiba’s New 128Gb NAND Chip”
During this week’s International Solid State Circuits Conference (ISSCC) I learned some very valuable information about memories built using crosspoint matrices.
Since ISSCC is a conference at which you meet the best and brightest minds in the industry it should come as no surprise that I was able to meet with several of the most forward-thinking industry luminaries. One of them explained to me a very fundamental difficulty with resistive RAMs (ReRAMs): These devices require a forward current to be programmed to a “1” and a reverse current to be set to a zero. This goes against the ideal crosspoint memory design in which a bit would consist of nothing more than a diode in series with a memory element. By inserting a diode, the current can only run in one direction, so a bit can be programmed or it can be erased, but not both. This is called Continue reading “How Do You Make a ReRAM Work?”
The annual International Solid State Circuits Conference (ISSCC) is a gathering in which the brightest minds in semiconductors come to meet and share the results of their recent research and development efforts. This year the four keynotes at the opening plenary centered on a “Green” outlook, through Storage, Control, Computing, and Energy.
Naturally, as “The Memory Guy,” I focused all of my attention upon the storage keynote, given by SanDisk’s recently-retired CEO Eli Harari. Some of the more interesting points I came away with were: Continue reading “Harari Delivers Inspiring Keynote at ISSCC”
A few articles at Computerworld, Tom’s Hardware, and The Verge were recently passed my way. These reported on a paper presented at last week’s USENIX conference that predicted how NAND flash’s future performance declines would impact tomorrow’s SSDs.
The paper found that SSD performance is likely to decrease over time as SSDs increase in capacity. The report postulates that SSDs of the future: “may be too slow and unreliable to be competitive against disks of similar cost in enterprise applications.”
Sadly, the Tom’s Hardware and Verge articles focused more on one of the assumptions behind the paper Continue reading “NAND SSD Performance to Decline over Time”
Soon after the death of Micron president Steve Appleton, former chairman & COO Jim Garrett passed away. Garrett died at age 64 from cancer.
Garrett joined Micron in 1985 as vice president of sales & marketing and became vice chairman in 1990. He served as chairman and chief operating officer from 1992-1994 until his resignation over allegations that another boardmember released internal company information.
Garrett had a good reputation as a positive manager who helped guide Micron through a very difficult period for the US DRAM industry.
For months rumors have abounded regarding Elpida’s viability and plans the company has to overcome its current financial woes. Although the company has been questioned about advanced payments and loans from its customers, takeover and merger possibilities, and even government intervention, Elpida has remained silent, refusing to comment.
Today the company finally made a statement that it will be adding a note to its Q3 results and earnings report: “on Matters concerning the Assumed Going Concern.”
This statement, which looks like it was written very carefully by either Continue reading “Elpida Finally Makes Statement”