Read-only (rom) memory
Read-only (rom) memory semiconductor memory unit that performs only the read operation, it does not have the write capability. The contents of each memory location is fixed during the hardware production of the device and cannot be altered. A rom has a set of k input address lines (that determine the number of addressable positions 2k ) and a set of n output data lines (that determine the width in bits of the information stored in each position). An integrated circuit rom may also have one or more enable lines for interconnecting several circuits and make a rom with larger capacity. Plain rom does not allow erasure, but programmable rom (prom) does. Static rom does not require a clock for proper operation, whereas dynamic rom does. See also random access memory, programmable read-only memory.
Source: http://ee.sharif.edu/~lcsl/useful/Electrical%20Engineering%20Dictionary.pdf
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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