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Mask ROM consists of a grid of word lines (the address input) and bit lines (the data output), selectively joined with transistor switches, and can represent an arbitrary look-up table with a regular physical layout and predictable propagation delay. Mask ROM is programmed with photomasks in photolithography during semiconductor manufacturing.
These devices are programmed with the same methods as the UV EPROM parts but are less costly. Embedded controllers may be available in both field-erasable and one-time styles, allowing a cost saving in volume production without the expense and lead time of factory-programmed mask ROM chips. [6]
An order from the engineering department (to be followed by the production department or vendor) overriding/superseding a detail on the drawing, which gets superseded with revised information. Also called by various other names, such as engineering change order (ECO), engineering change notice (ECN), drawing change notice (DCN), and so on.
SDP—Session Description Protocol; SDR—Software-Defined Radio; SDRAM—Synchronous Dynamic Random-Access Memory; SDSL—Symmetric DSL; SE—Single Ended; SEI—Software Engineering Institute; SEO—Search Engine Optimization; SFTP—Secure FTP; SFTP—Simple File Transfer Protocol; SFTP—SSH File Transfer Protocol; SGI—Silicon Graphics ...
In a valid expansion ROM, this signature is followed by a single byte indicating the number of 512-byte blocks the expansion ROM occupies in real memory, and the next byte is the option ROM's entry point (also known as its "entry offset"). If the ROM has a valid checksum, the BIOS transfers control to the entry address, which in a normal BIOS ...
A field that causes magnets and currents to experience forces. magnetic flux density The amount of magnetic field per unit area; in SI units, measured in webers per square metre. magnetic flux The magnetic field; a conductor that encloses a changing magnetic flux will have a voltage induced in it. magnetic moment
An electronic device or embedded system is said to be field-programmable or in-place programmable if its firmware (stored in non-volatile memory, such as ROM) can be modified "in the field", without disassembling the device or returning it to its manufacturer. [1]
Glossary of aerospace engineering This article includes an engineering-related list of lists . If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article.