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Mask-programmed ROM
Mask-programmed ROM
Special masks are used when the chip is made, so that the content of every memory location is fixed from the beginning. It can never be altered. In other words, the ROM is a special kind of logic device in which each different combination of logic levels on the address bus produces a corresponding combination of logic levels on the data bus. Making special masks is a very expensive so this type of ROM is used only when it is known in advance that thousands of them will be required.
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Mask-programmed ROM
Mask-programmed ROM
Special masks are used when the chip is made, so that the content of every memory location is fixed from the beginning. It can never be altered. In other words, the ROM is a special kind of logic device in which each different combination of logic levels on the address bus produces a corresponding combination of logic levels on the data bus. Making special masks is a very expensive so this type of ROM is used only when it is known in advance that thousands of them will be required.
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