BUS Standards

1. BUS Standards

3. Introduction • Buses carry signal between the components. • A bus is a common pathway in which data can travel within a computer. • This pathway used for communication and can be established between elements

4. Different types of Bus • ISA - Industry Standard Architecture • EISA - Extended ISA • VESA - Video Electronics Standards Association, VL Bus • PCI - Peripheral Component Interconnect • USB - Universal Serial Bus • AGP - Advanced Graphics Port

5. ISA Bus • ISA stands for IndustryStandardArchitecture. It was a computer bus standard for IBM compatible computers. • ISA is the basics foArModern Personal Computer. Based on the number of bits that can be transferred on the bus.

6. ISA Bus Architecture

7. There are two versions of ISA bus. • 8 bit ISA bus • 16 bit ISA bus

8. 8 bit ISA Bus • The speed of 8 bit ISA is 4.77 MHz • The Maximum bandwidth of 8 bit ISA bus is 4.17 MB/sec • The bus slot provides 8 data lines and 20 address lines

9. 8 bit ISA Bus

10. 16bit ISA Bus • The 16 bit ISA bus Man at a speed of 8 MHz • The maximum bandwidth by the 16bit ISA Bus is 8.33 MB/sec • The 16 bit ISA bus adding an optional 16 bit extension connector

11. 16bit ISA Bus

12. EISA Bus • The Extended Industry Standard Architecture is a bus standard for IBM compatible computers. • EISA buses are 32 bits wide and support multiprocessing.

14. EISA Bus Architecture

15. VESA Bus • The VESA Local Bus (usually abbreviated to VL-Bus or VLB) was mostly used in personal computers.  • VESA (Video Electronics Standards Association) Local Bus worked alongside the ISA bus. • It acted as a high-speed conduit for memory-mapped I/O and DMA, while the ISA bus handled interrupts and port-mapped I/O.

16. VESA Bus

17. PCI Bus • The PCI (Peripheral Component Interconnect) is a high performance Bus for interconnecting chips, expansion boards, and memory cards. • It was originated at Intel Inc. In the early 1990’s as standard methods of interconnecting chips on a board. 

18. Information typically transferred across the PCI bus at 33 MHz and 32 bit at a time. • The bandwidth is calculated from the following formula. 3.33 MHz x 4 bytes (32 bits) = 133 MB/sec.

19. PCI Bus Architecture

20. Bus slots

21. USB Bus • Universal Serial Bus (USB) is a specification to establish communication between devices and a host controller. • USB was designed for personal computers, but it has become commonplace on other devices such as smart phones, PDAs and video game consoles, and as a power cord.

22. USB Bus

23. USB Bus interface

24. Important Signals

25. The End ……Thank you……