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In this type of inter-connection, the three units share a single bus. Hence the information can be transferred only between two units at a time. Here the I/O units use the same memory address space. This simplifies programming of I/O units as no special I/O instructions are needed. This is one of advantages of single bus organization.
Figure 3.5: Single-Bus Organization
The transfer of information over a bus cannot be done at a speed comparable to the operating speed of all the devices connected to the bus. Some electromechanical devices such as keyboards and printers are very slow whereas disks and tapes are considerably faster. Main memory and processors operate at electronic speeds. Since all the devices must communicate over the bus, it is necessary to smoothout the differences in timings among all the devices.
A common approach is to include buffer register with the devices to hold the information during transfers. To illustrate this let us take one example. Consider the transfer of an encoded character from the processor to a character printer where it is to be printed. The processor sends the character to the printer output register over the bus. Since buffer is an electronic register this transfer requires relatively little time. Now the printer starts printing. At this time bus and the processor are no longer needed and can be released for other activities. Buffer register is not available for other transfers until the process is completed. Thus buffer register smoothes out the timing differences between the processor, memory and I/O devices. This allows the processor to switch rapidly from one device to another interweaving its processing activity with data transfer involving several I/O devices.
What else can I help you with?
Discuse the relative merits de merits of single two three bus structure?
Discuse the relative merits de merits of single two three bus structure
Could u explain the fast bus in serial and parallel?
because serial bus moves in single way where parallel bus moves in different ways.
Merits demerits of single two three bus structure?
A multiple bus structure (two or three tier) provides better performance as more data can be moved and faster. However, such systems are much more expensive to acquire and maintain than single bus systems.
How much number of units communicate in a single bus structure?
Answering "http://wiki.answers.com/Q/How_much_number_of_units_communicate_in_a_single_bus_structure"
How many seats on a single Decker bus?
A single decker bus has 75 seats.
Define bus incidence matrix?
explain bus incidence matrix.
What kind of bus where the Jews on during the Holocaust?
Bus? Please explain.
How many devices can be used on a single SCSI bus?
8 Devices can be used on a single SCSI bus.
Is the address bus a single direction bus?
Yes, the address bus is uni-directional.
What is benefit of multiple bus architecture compared to single bus architecture?
bus is long
How many units in a single bus structurecommunicate at atime?
In a single bus structure, typically only one unit can communicate at a time. This is because the bus serves as a shared communication pathway, and when one device is transmitting data, others must wait for their turn. This sequential access helps to avoid data collisions but can lead to potential bottlenecks in data transfer rates.
What areas can one view the local bus schedules?
Local bus schedules are often posted at bus stops and stations. The main bus stations sometimes have leaflets that detail bus timetables and many bus companies have an online schedules that are easy to access.
