Characteristics of Bus

Posted by : Unknown Thursday, May 14, 2015

Data & Address Buses

Data bus : Is the lines that carry the data being transferred.

Address bus : The set of line that carry info where the data is to be transferred to or from.

Control Bus

Control Bus : Control lines that controls bus function and to signal when data is available.

Bus Width

a) Number of bits that can travel in parallel down the bus.

b) More info can flow over the channel when it is wider.

c) The old PC were 16bits ~ 32 bits, latest were 64bits.

Bus Speed

a) How many bits of info can be sent across each wire each second.

b) Analogy: how fast the fast are drive on our analogical highway.

c) Most buses transmit one bit of data per clock cycle, but newer can be double of the speed.

Bus Bandwidth

a) Total amount of data transferred on the bus in a give unit of time.

b) Measured in bits/bytes per second.

c) Bandwidth = bus width x bus speed

d) For slow bus, bandwidth = half of the normal bandwidth

Bus System