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* [[EPROM]]: erasable programmable read-only memory technology. One-time programmable but with window, can be erased with ultraviolet (UV) light. CMOS. Obsolete.
* [[EEPROM]]: electrically erasable programmable read-only memory technology. Can be erased, even in plastic packages. Some but not all EEPROM devices can be in-system programmed. CMOS.
* [[Flash memory|Flash]]: flash-erase EPROM technology. Can be erased, even in plastic packages. Some but not all flash devices can be in-system programmed. Usually, a flash cell is smaller than an equivalent EEPROM cell and is, therefore, less expensive to manufacture. CMOS. Example: Actel ProASIC family.<ref name=EDN/
== Manufacturers ==
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In March 2010, [[Tabula (company)|Tabula]] announced their FPGA technology that uses [[Time-division multiplexing|time-multiplexed]] logic and interconnect that claims potential cost savings for high-density applications.<ref>{{cite web |title=Tabula's Time Machine — Micro Processor Report |url=http://www.tabula.com/news/M11_Tabula_Reprint.pdf |url-status=dead |archive-url=https://web.archive.org/web/20110410094902/http://www.tabula.com/news/M11_Tabula_Reprint.pdf |archive-date=2011-04-10}}</ref> On March 24, 2015, Tabula officially shut down.<ref>[http://www.bizjournals.com/sanjose/news/2015/02/11/tabula-to-shut-down-120-jobs-lost-at-fabless-chip.html Tabula to shut down; 120 jobs lost at fabless chip company] Silicon Valley Business Journal</ref>
On June 1, 2015, Intel announced it would acquire Altera for approximately [[US$]]16.7 billion and completed the acquisition on December 30, 2015.<ref>{{cite news|url=https://www.reuters.com/article/us-altera-m-a-intel-idUSKBN0OH2E020150601|title=Intel to buy Altera for $16.7 billion in its biggest deal ever|newspaper=Reuters|date=June 2015}}</ref>
On October 27, 2020, AMD announced it would acquire Xilinx<ref>{{cite news|url=https://www.amd.com/en/press-releases/2020-10-27-amd-to-acquire-xilinx-creating-the-industry-s-high-performance-computing|title=AMD to Acquire Xilinx, Creating the Industry's High Performance Computing Leader|date=October 2020}}</ref> and completed the acquisition valued at about US$50 billion in February 2022.<ref>{{cite news|url=https://www.reuters.com/technology/amd-closes-biggest-chip-acquisition-with-498-bln-purchase-xilinx-2022-02-14/|title=AMD closes record chip industry deal with estimated $50 billion purchase of Xilinx|newspaper=Reuters|date=February 2022}}</ref>
In February 2024 Altera became
Other manufacturers include:
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