How memory is accessed for an even and odd address?
One of the banks contain even addresses called Even bank and the other contain odd addresses called Odd bank. This banking scheme allows to access two aligned memory locations from both banks simultaneously and process 16 bit data transfer.
How does 8086 processor access a word from an odd memory location?
When a 16 bit word is to be read from memory at an odd memory address say 125, the CPU first puts 124 on the address bus and gets the contents at location 125 in the higher order byte. In the next clock cycle the CPU puts 126 on the address bus and gets the contents at location 126 in the low order byte.
Why is the 8086 memory divided into odd and even banks?
8086 has 20-bit addressing model for memory access. Each address represents a single byte – however, the natural word size of 8086 is 2 bytes, so you need a way to read two bytes at the same time – hence, two banks.
When data is stored in even address then the number of memory cycles required to access the data is?
If the lower byte of the word is stored at even memory bank and the upper byte is stored at odd memory bank then the CPU will require only 1 memory cycle. So, it is better to store data in this way. If the lower byte of the word is located at an odd memory address, then the CPU will require 2 memory cycles.
How many memory locations can be addressed by 8086?
8086 has a 20 bit address bus can access upto 220 memory locations ( 1 MB) . It can support upto 64K I/O ports.
How many locations are addressed using 18 address bits?
How many memory locations are addressed using 18 address bits? Explanation: For n address bits, the memory location will consist of 2n bits. Using 18 address bits, 218 = 262,144 (= 256 K) words are addressed.
How many locations can be addressed?
Answer: Aroun 16 Kilo Bytes of memory locations can be addressed. You can calculate the number of memory locations by using this formula: No. of Memory locations = 2^n, where n = number of address lines.
How much memory can a 32 bit address?
The CPU register stores memory addresses, which is how the processor accesses data from RAM. One bit in the register can reference an individual byte in memory, so a 32-bit system can address a maximum of 4 GB (4,294,967,296 bytes) of RAM.