Archive for January 2012
• It is 16-bit register, which identifies the location of the next word of instruction code that is to be fetched in the current code segment.
• IP contains an offset instead of the actual address of the next instruction.
• The 20-bit address produced after addition of the offset stored in IP to segment base address in the CS is called the Physical address of the code byte.
The Bus Interface unit (BIU)
This unit handles all transfer of data and addresses on the buses for the EU(execution unit). This unit sends out addresses, fetches instructions from memory, reads data from ports and memory and writes data to ports and memory.
Different Parts of BIU: