buses
DESCRIPTION
TRANSCRIPT
Buses
bus is a subsystem that transfers data between components inside
a computer, or between computers.
Introduction of bus in (CSA)
Two type of buses
a bus located strictly within a CPU chip for communications among the components in a
CPU chip
Internal bus
External buses are supported by third-party hardware and software, and are more likely to
adhere to one of a number of industry standards for buses
bus is located outside a CPU chip for connecting the system components to the CPU.
External Bus
• This is the highest-level bus that the chipset uses to send information to and from the processor
Processor Bus (System
Bus)
• Higher-level architectures, employ a dedicated bus for accessing the system cache
Cache Bus (Backside
Bus)
• Second-level system bus that connects the memory subsystem to the chipset and the processor
Memory Bus
Bus Hierarchy
• For example, video cards, etc• The two most common local
I/O buses are the VLB and PCI.
The Local I/O Bus (High-speed
I/O Bus)
The illustration shows how the various buses connect to the
CPU.
1-Data and Address Buses
2-Bus Bandwidth
3-Bus Width
4-Bus Width
4 Characteristics of Bus
wide array of integrated
technologies on it, as it has multiple buses (ISA, PCI and AGP
to name a few) onboard
The ISA slots are the black slots on the lower portion of
the board in the image
Standards Bus Architecture
A-Industry Standard
Architecture (ISA) Bus
B-Micro Channel
Architecture (MCA) Bus
C-Extended Industry Standard
Architecture (EISA) Bus
D-VESA Local Bus
(VLB)
E-Peripheral Component Interconnect (PCI) Local
Bus
Bus standard
F-Accelerated Graphics Port (AGP)