Expansion Buses Flashcards
What is a Bus?
A collection of wires/tracks that transfer data or power between computer components
What are the seven charateristics of a bus
Clock speed, width, Bus performance, Control signals, Logical and physical connection, Internal and external and Serial and parallel.
What is clock speed
number of times a bit is sent alond the bus measures how quickly bits move along a bus
What is the width of a bus?
Number of data bits that can be sent along the bus at once ie 8, 16, 32 & 64 bits
How is bus performance measured?
Bus throughput is the number of bytes of data that can be transferred via the bus in one second.
How do you calculate a Buses throughput
Bus clockspeed times bus width
What information make up Bus control signals?
Which component the data is for, where blocks of data start and end and any other into related to the data.
What are the two different types of bus connections?
Logical connection - one to many, and Physical connection each bus defines its set of connectors
Whats the difference between an internal bus and an external bus?
An internal bus connects all the internal components of a computer to the motherboard. An external bus connects external peripherals to the motherboard.
Whats the difference between a serial and parallel bus?
Serial buses carry data in bit-serial form, parallel buses carry data words striped across multiple wires. which has a problem with crosstalk.
What is a BSB
Backside bus - The bus that connects the processor to the different levels of chache found on the processor chip.
What is a FSB
Front side bus The bus that connects the processor to different hardware components found on the motherboard.
What is an expansion bus?
A Collection of wires and protocols that allows the expansion of a computer by inserting printed circuit boards
What are the 8 different types of expansion bus?
PC Bus, ISA, MCA, EISA, VESA, PCI, AGP and PCI Express
What does ISA stand for?
Industry Standard Architecture - Used on 286 - pentium 4
What is the width and throughspeed of an ISA Bus?
16b and 8 Mhz
What does MCA stand for?
Microchannel Architecture
What happened to the MCA bus?
Discontinued due to not becoming popular.
What was the difference between an MCA and an ISA bus?
MCA is twice the width of ISA but not compatible with ISA or PC Bus. Width 32b and speed 10 Mhz or 16 Mhz
What is EISA
Extended Industry Standard Architecture
What was EISA used on?
486s back in 1998
What was the speed and width of the EISA bus?
speed 8.33Mhz and width 32b
What does VESA stand for?
Video Electronics Standards Association
What is a VESA bus?
Twice the width of ISA and ISA and PC Bus are backwards compatible with it. Used on 486s with a width of 32b and speed of 66 Mhz
What does PCI stand for?
Peripheral Components Interconnect
What is PCI 1.0?
Expansion Bus used on Pentium Motherboards. Supports plug n play. transfers data only on one edge of the clock signal.
When was PCI 1.0 introduced?
1992
What is the width and speed of the PCI 1.0
Width 32b and speed 33 Mhz
What is PCI 2.0?
Faster and wider upgrade to PCI 1.0 width 64b and speed 66 Mhz. Backwards compatible with PCI 1.0
What is the difference in slots between VESA and PCI?
VESA has a maximum number of 3 slots where PCI has a maximum 8-10 slots.
Whats the difference in size between VESA and PCI?
VESA is long and is ISA and PC Bus compatible whereas PCI are shorter and more compact connector
What does AGP stand for?
Accelerated Graphics Port
When was the AGP port brought in?
1997 - used for Pentium 2 motherboards
What is the AGP port used for?
Graphics card. speeds up 3D rendering and VR.
What is the width and speed of the AGP port
width 32b. Speed 66Mhz
What does PCIe stand for?
Peripheral Components Interconnect Express
What computers use PCIe
Pentium 4 motherboards
What protocol does PCIe use?
A packetised protocol.
What does PCIe call point to point connections?
lanes
