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ROM

Read-only memory (ROM) is a class of storage medium used in computers and other electronic devices. Data stored in ROM can only be modified slowly, with difficulty, or not at all, so it is mainly used to distribute firmware (software that is very closely tied to specific hardware, and unlikely to need frequent updates). Strictly, read-only memory refers to memory that is hard-wired, such as diode matrix and the later mask ROM. Although discrete circuits can be altered (in principle), Integrated Circuits (ICs) cannot and are useless if the data is bad. The fact that such memory can never be changed is a large drawback; more recently, ROM commonly refers to memory that is read-only in normal operation, while reserving the fact of some possible way to change it. Other types of non-volatile memory such as erasable programmable read only memory (EPROM) and electrically erasable programmable read-only memory (EEPROM or Flash ROM) are sometimes referred to, in an abbreviated way, as "read-only memory" (ROM); although these types of memory can be erased and re-programmed multiple times, writing to this memory takes longer and may require different procedures than reading the memory.[1] When used in this less precise way, "ROM" indicates a non-volatile memory which serves functions typically provided by mask ROM, such as storage of program code and nonvolatile data.

Memory > ROM > Flash Memory

型号	DS	厂牌	批号	数量	地区	采购
AT45DB642D-CNU		Adesto	-	2700	中国	要求报价
AT45DB642D-CNU		Adesto	201409+	1	中国	要求报价
AT45DB642D-CNU		Adesto	201412+	40	中国	要求报价
AT45DB642D-CNU		Adesto	201409+	295	中国	要求报价
AT45DB642D-CNU		Adesto	201312+	12	中国	要求报价
AT45DB642D-CNU		Adesto	-	44	中国	要求报价
AT45DB642D-CNU		Adesto	2021	8000	香港	要求报价

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