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- Memory_data_register abstract "The Memory Data Register (MDR) or Memory Buffer Register (MBR) is the register of a computer's control unit that contains the data to be stored in the computer storage (e.g. RAM), or the data after a fetch from the computer storage. It acts like a buffer and holds anything that is copied from the memory ready for the processor to use it.The MDR is a two-way register. When data is fetched from memory and placed into the MDR, it is written to go in one direction. When there is a write instruction, the data to be written is placed into the MDR from another CPU register, which then puts the data into memory.The Memory Data Register is half of a minimal interface between a microprogram and computer storage, the other half is a memory address register (MAR).Far more complex memory interfaces exist, but this is the simplest that can work.The Memory Data Register (MDR) contains the data value being fetched or stored. It is a common mistake to say that the MDR should be W bits wide, where W is the cell size. However, on most computers the cell size is only 8-bits, and most data values occupy multiple cells. Thus, the size of the MDR is usually a multiple of 8. Typical values of MDR width are 32 and 64 bits, which would allow us to fetch, in a single step, either an integer or a real value.For example, to retrieve the contents of cell 123, we would load the value 123 (in binary) into the MAR and perform a fetch operation. When the operation is done, a copy of the contents of cell 123 would be in the MDR. To store the value 98 into cell 4, we load a 4 into the MAR and a 98 into the MDR and perform a store. When the operation is completed the contents of cell 4 will have been set to 98, by discarding whatever was there previously.MDR has two inputs and two outputs. Data may be loaded into MDR either from the memory bus or from the internal processor bus.The data stored in MDR may be placed on either bus.".
- Memory_data_register wikiPageID "20071".
- Memory_data_register wikiPageLength "2247".
- Memory_data_register wikiPageOutDegree "8".
- Memory_data_register wikiPageRevisionID "700873485".
- Memory_data_register wikiPageWikiLink Category:Digital_registers.
- Memory_data_register wikiPageWikiLink Computer.
- Memory_data_register wikiPageWikiLink Computer_data_storage.
- Memory_data_register wikiPageWikiLink Control_unit.
- Memory_data_register wikiPageWikiLink Memory_address_register.
- Memory_data_register wikiPageWikiLink Microcode.
- Memory_data_register wikiPageWikiLink Processor_register.
- Memory_data_register wikiPageWikiLinkText "Memory data register".
- Memory_data_register wikiPageWikiLinkText "Memory-buffer register".
- Memory_data_register wikiPageWikiLinkText "memory data register".
- Memory_data_register wikiPageWikiLinkText "memory-buffer register".
- Memory_data_register wikiPageUsesTemplate Template:Compu-hardware-stub.
- Memory_data_register wikiPageUsesTemplate Template:Merge.
- Memory_data_register wikiPageUsesTemplate Template:Unreferenced.
- Memory_data_register subject Category:Digital_registers.
- Memory_data_register hypernym Register.
- Memory_data_register type Building.
- Memory_data_register type Circuit.
- Memory_data_register comment "The Memory Data Register (MDR) or Memory Buffer Register (MBR) is the register of a computer's control unit that contains the data to be stored in the computer storage (e.g. RAM), or the data after a fetch from the computer storage. It acts like a buffer and holds anything that is copied from the memory ready for the processor to use it.The MDR is a two-way register. When data is fetched from memory and placed into the MDR, it is written to go in one direction.".
- Memory_data_register label "Memory data register".
- Memory_data_register sameAs Q183380.
- Memory_data_register sameAs Memory_Data_Register.
- Memory_data_register sameAs Registro_MDR.
- Memory_data_register sameAs Registre_Tampon_Mémoire.
- Memory_data_register sameAs Memory_Data_Register.
- Memory_data_register sameAs m.051b8.
- Memory_data_register sameAs Q183380.
- Memory_data_register sameAs 記憶體資料寄存器.
- Memory_data_register wasDerivedFrom Memory_data_register?oldid=700873485.
- Memory_data_register isPrimaryTopicOf Memory_data_register.