About MASK ROM (MROM)
Mask ROM (MROM) chips contain a software mask that is burned onto the chip during the design phase of the semiconductor manufacturing process. In high volumes, mask read-only memory (ROM) is a cost-effective alternative to programmable read-only memory (PROM), erasable read-only memory (EEROM), electrically erasable read-only memory (EEPROM), non-volatile read only memory (NVRAM), and Flash memory. Unlike these other computer memory chips, Mask ROM (MROM) chips are produced by arranging transistors before the semiconductor manufacturing process actually begins. Often, Mask ROM (MROM) chips are used in computer systems that require long-term sustainability. Examples of computer systems that use Mask ROM chips or MROM chips include network operating systems and server operating systems. Other computer systems typically use a different computer memory type.
To produce Mask ROM (MROM) chips, integrated circuits (ICs) are masked during the design phase of the semiconductor fabrication process. In its simplest form, a semiconductor is defined as a material that is half-conductive and half-insular, and that can be altered by electrical impulses. Design considerations for a mask ROM chip or MROM chip include transistor width and placement. Often, this is the sole consideration of a mask ROM chip designer, since process engineers typically lay out all of the other parameters before tanking. There are two types of semiconductors: N-type and P-type. N-type semiconductors contain higher concentrations of electrons. P-type semiconductors contain lower concentrations. This distinction is responsible for overall design differences in the production of Mask ROM (MROM) chips, since lower concentrations do not permit the hardwiring of as many transistors. In turn, these differences affect the capacitance and storage density abilities of the IC.
More >>Engineering Web: MASK ROM MROM
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A 64 Mb MROM with good pair selection architecture Francisco, CA, USA Item Abstract: The needs for high density mask programmable ROM (MROM) have increased rapidly due to the demand for storing the |
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A 3.3 V 133 MHz 32 Mb synchronous mask ROM [in CMOS A 3.3 V 133 MHz 32 Mb synchronous mask ROM [in CMOS |
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Interfacing the CY7C276 High - Speed PROM to the AT&T, AD,... This can save the expense of going to MROM pre-maturely. See Cypress Semiconductor Corp. Information |
