The document discusses bus and memory transfer in a computer system. It explains that a bus is used to efficiently transfer information between registers by providing a single shared set of wires, rather than separate lines between each register. A bus structure consists of a set of common lines that can transfer binary information one register at a time, determined by control signals. The document presents two ways to construct a bus: using multiplexers or using three state buffers. It provides an example of a bus system for transferring data between four 4-bit registers and diagrams a bus line implemented with three state buffers. The document concludes by mentioning memory transfer via bus.

1. Bus and Memory Transfer
Presented by:
Rishi Ram Khanal
BIM III (TU)
1081
1

2. Items
 Why???
 Bus
 Using multiplexer
 Bus system for four register
 Three state bus buffer
 Bus line with three state buffer
 Memory transfer
1
2

3. Why???
 A typical digital computer has many register and paths must
be provided to transfer information from one register to
another .
 The number of wires will be excessive if separate lines are
used between each register and all other registers in
the system.
 A more efficient scheme for transferring information
between registers in a multiple register configuration is a
common bus system.
1
3

4. BUS
 Bus is a single shared set of wires connecting all registers.
 A bus structure consists set of a common lines each for each registers,
through which binary information can transfer one at a time.
 Control signal determine that which register is connected with bus line at
a time to transfer information.
 Here, we will see the two ways to construct the bus:
i. By using multiplexers and
ii. By using three state buffer.
4

5. 1
5

6. Bus system for four register with four bits
1
6

7. 1
7

8. Bus line with three state-buffers
1
8

9. 1
9

10. 1
10