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What are the different steps during the read cycle of memory?
Read From Memory Steps1 Processor signals the memory to be read on to address bus.2 Specific memory chips that hold the memory location are made ready.3 Chip select is generated.4 A delay is added to allow the memory to settle and to be available to read.5 Data is placed on to the data bus.6 Control unit turns on the read line on control bus.7 Data is placed on to the (MDR) memory data registry
What is the purrpose of a control unit in a processor?
Control unit generates all the control signals like memory read signal,i/o read signal,memory write signal etc
What slots of notebooks allows you to read flash memory cards?
ExpressCard
Which memory in a computer that allows simultaneous read and write operations?
RAM
Why Is Wait For Memory Function Completed Step Needed When Reading From Or Writing To The Main Memory?
When CPU needs to access a memory location for read or write, it places an address on the address bus. In case of Read, data is meant to be read into Memory Data Register (MDR) and in case of Write, the data (to be written to memory) is put in the MDR.After that CPU issues the Read or Write signal.However, CPU needs to know when the desired memory function (Read or Write) has been completed..This line back to the CPU saying that the operation is complete is sometimes called memory function complete (MFC).In the meanwhile, the instruction or step that is executed by the CPU is known as Wait for Memory Function Completed (WMFC)To summarize:To read (if you are a CPU): Put the desired memory address in the MAR.Assert the Read control line.Wait for the MFC line to be set to 1 by the main memory unit. (Or wait for the appropriate amount of time, if there's no MFC line with your particular main memory unit you are using (rare these days).)Get the data out of the MDR.To write (again, if you are a CPU): Put the desired memory address in the MAR and put the desired data in the MDR.Assert the Write control line.Wait for the MFC line to be set to 1 by the main memory unit
Why is the wait for memory function completed step needed when reading from or writing to main memory?
When CPU needs to access a memory location for read or write, it places an address on the address bus. In case of Read, data is meant to be read into Memory Data Register (MDR) and in case of Write, the data (to be written to memory) is put in the MDR.After that CPU issues the Read or Write signal.However, CPU needs to know when the desired memory function (Read or Write) has been completed..This line back to the CPU saying that the operation is complete is sometimes called memory function complete (MFC).In the meanwhile, the instruction or step that is executed by the CPU is known as Wait for Memory Function Completed (WMFC)To summarize:To read (if you are a CPU): Put the desired memory address in the MAR.Assert the Read control line.Wait for the MFC line to be set to 1 by the main memory unit. (Or wait for the appropriate amount of time, if there's no MFC line with your particular main memory unit you are using (rare these days).)Get the data out of the MDR.To write (again, if you are a CPU): Put the desired memory address in the MAR and put the desired data in the MDR.Assert the Write control line.Wait for the MFC line to be set to 1 by the main memory unit
What are notebooks often equipped with that allows you to read flash memory cards?
USB
Similarities between ram and rom?
There are none as RAM allows random write access while ROM only allows read access (the very reason why it's called ROM because it stands for Read-Only Memory).
What is the slot called that allows you to read flash memory cards on a notebook?
On a notebook, an ExpressCard slot will allow you to read flash memory cards. This interface was formerly known as a NEWCARD.
Read only memory?
Memory hardware that allows fast access to permanently stored data but prevents addition to or modification of the data.
What is the advantage of Direct Memory Access?
DMA allows a peripheral device to read from/write to memory without going through the CPU. DMA allows for faster processing since the processor can be working on something else while the peripheral can be populating memory.
Why read and write control lines in a dma controller bidirectional?
The read and write control lines running through the data buses have control signals. The microprocessor can read data from memory or write data to the memory so the data buses are bidirectional. One direction is needed to write the data while another direction is required for the read command to fetch the data.
