What is the difference between word addressable and byte-addressable memory?

What is the difference between word addressable and byte-addressable memory?

Now we can clearly state the difference between Byte Addressable Memory & Word Addressable Memory. When the data space in the cell = 8 bits then the corresponding address space is called as Byte Address. When the data space in the cell = word length of CPU then the corresponding address space is called as Word Address.

Is word addressable is better than byte-addressable of memory?

The 386SX, which addresses memory in 8-bit units but can fetch and store it 16 bits at a time, is termed byte-addressable. The advantage of word addressing is that more memory can be addressed in the same number of bits. The IBM 7094 has 15-bit addresses, so could address 32,768 words of 36 bits.

What is the difference between bit addressable and byte-addressable?

In word addressable cpu accesses 4 bytes at a time using 32 bits bidirectinal data bus but in byte addressable size of the data bus is 8 bits. Byte addressable memory are read only, that is we can’t write to word addressable memory. But word addressable memory can be read/write both.

What is word addressable memory?

From Wikipedia, the free encyclopedia. In computer architecture, word addressing means that addresses of memory on a computer uniquely identify words of memory. It is usually used in contrast with byte addressing, where addresses uniquely identify bytes.

What is the difference between a byte and a word of memory?

A byte is eight bits, a word is 2 bytes (16 bits), a doubleword is 4 bytes (32 bits), and a quadword is 8 bytes (64 bits).

What does the word addressable means?

1 : able to be addressed : directly accessible addressable registers in a computer. 2 : of or relating to a subscription television system that uses decoders addressable by the system operator.

Which is the fastest memory?

Fastest memory is cache memory.

  • Registers are temporary memory units that store data and are located in the processor, instead of in RAM, so data can be accessed and stored faster.
  • What is bit addressable and byte addressable 8051?

    Bit-addressable RAM Of the 128-byte internal RAM of the 8051, only 16 bytes are bit-addressable. The rest must be accessed in byte format. The bit-addressable RAM locations are 20H to 2FH. These 16 bytes provide 128 bits of RAM bit-addressability since 16×8= 128.

    What’s the difference between a bit and a byte?

    So, bits and bytes are both units of data, but what is the actual difference between them? One byte is equivalent to eight bits. A bit is considered to be the smallest unit of data measurement. A bit can be either 0 or 1.

    What do you understand by bit addressable memory?

    Bit-addressable objects are objects that may be addressed as words or as bits. Only data objects that occupy the bit-addressable area of the 8051 internal memory fall into this category.

    What is a word memory?

    A group of memory bits in a RAM or ROM block. For example, the content5_[4.. In Verilog HDL, a memory word is a register in a memory (that is, RAM or ROM) block that contains the same range of bits as the other registers in the memory. …

    Can a word be 8 bits?

    An 8-bit word greatly restricts the range of numbers that can be accommodated. But this is usually overcome by using larger words. With 8 bits, the maximum number of values is 256 or 0 through 255.

    What’s the difference between byte addressable and word addressable memory?

    So this type of addressing in which we treat each section of memory which is that storage of 32 bits or 4 bytes is known as Word Addressable Memory. While continuing the same example as we know that we have total 4096 sections and each section storing a word of length 32 bits or simply 4 bytes.

    What’s the difference between a byte and a word?

    That is the only way we can use memory. In reality, memory is only byte addressable. It means: A binary address always points to a single byte only. A word is just a group of bytes – 2, 4, 8 depending upon the data bus size of the CPU.

    How is CPU addressable similar to word addressable?

    Same as in Step 1 of word addressable, but the CPU now can directly address the 3rd byte of the word, using the lower 2 b i t s byte offset. However, I’m confused how that would happen. Since, the CPU register size has a width of 1 word, similar to the word addressing, one word out of the 8 words in the block will be transferred to the register.

    How many lines of addressable memory does a CPU have?

    If this machine is word addressable, then the address bus of the CPU will have 30 lines ( 32 − l o g 2 4 = 30 ), which enables it to access memory ONLY in words/chunks of 4 bytes and that too from addresses which are a multiple of the wordsize.