How many address buses, control buses, and data buses are there

16-bit computer: 32-bit address bus;Data bus.

16-bit;Control bus 16-bit;

32-bit computer: 64-bit address bus;Data bus 32-bit;Control bus 32-bit;

Address bus. Now we know that the CPU specifies the storage unit through the address bus. The CPU can address as many memory units as it can transmit on the visible address bus.

Now let's say a CPU has 10 address buses, let's take a look at its addressing. We know that in an electronic computer, there are only two steady states that can be transmitted by a wire, high or low. In binary, it means 1 or 0, and 10 wires can transmit 10 bits of binary data.

And how many different data can a 10-bit binary represent?2 to the 10th power. The minimum number is 0 and the maximum number is 1023.

The figure shows a CPU with 10 address lines sending address information to memory at 11 and 10 address lines transmitting binary information. Consider what is being delivered on the address bus when accessing a memory cell with address such as

If a CPU has n address lines, it can be said that the width of the address bus of this CPU is n. Such a CPU can look for up to 2 to the nth power memory units.

Data bus. Data transfer between the CPU and memory or other devices is carried out via a data bus. The width of the data bus determines the speed at which the CPU and the outside world can transfer data.

Eight data buses can transmit one 8-bit binary data (i.e., one byte) at a time. The 16 data buses can transmit two bytes at a time.

The data bus width of the 8088 CPU is 16. Let's take a look at how they transmit data over the data bus when they write data to memory 89d8h. The figure shows the data transfer on the 8088 CPU data bus

The figure shows the data transfer on the 8086 CPU data bus.

The 8086 has 16 data lines and can transmit 16-bit data at a time, so it can transmit data at a time for 89d8h;However, the 8088 only has 8 data lines, and can only transmit 8 bits of data at a time, so it needs to transmit data twice when writing data to the memory for 89d8h.

Control bus. The control of the CPU over the external components is carried out through the control bus. Here the control bus is a general term, and the control bus is a collection of different control lines.

The number of control buses means how many controls the CPU provides over external devices. Therefore, the width of the control bus determines the CPU's ability to control external devices.

The memory read or write command mentioned above is issued by a combination of several control lines, one of which is called "read signal output" is responsible for transmitting read signals from the CPU, and the CPU outputs a low level to the control line to indicate that the data is about to be read: there is a control line called "write signal output" that is responsible for transmitting write signals.

Data bus. 1) It is the channel for data transfer between the CPU and memory or other devices.

2) The width of the data bus determines the data transfer speed between the CPU and the outside world.

3) Each transmission line can only transmit 1 bit of binary data at a time. eg: 8 data lines can transmit one 8-bit binary data (i.e. one byte) at a time.

4) The data bus is the sum of the number of data lines.

Address bus. 1) The CPU specifies the storage unit through the address bus.

2) The address bus determines the maximum amount of memory space that the CPU can access. eg: The largest memory that 10 address lines can access is 1024-bit binary data (1024 memory cells) (1b).

3) The address bus is the sum of the number of address lines.

Control bus. 1) The CPU controls the external devices through the control bus.

2) The width of the control bus determines the CPU's ability to control external devices.

3) The control bus is the sum of the number of control lines.

The geosite macro bus, data bus and control bus of the computer work together as follows:

The address bus is responsible for selecting the location of the storage device and sending the selected information to the data bus and the control bus.

The data bus is used to transfer data, and it is responsible for taking the data from the memory device and transferring it to the appropriate device.

The control bus is used to control vertical communication between devices, such as starting the device, reading data, and controlling the operation of the device.

These buses form a triangular structure in the computer, where the address bus is at the vertex, the data bus is at the second vertex, and the control bus is at the third vertex. With this structure, computers can communicate and control between various devices.

The three categories of address bus, data bus, and control bus are divided according to ().

a.The location of the bus.

b.The bus transmits the content of the World Rubber Scramble.

c.The transmission mode of the bus is searched.

d.The direction in which the bus is transmitted.

Correct answer: B

The function of the address line in the system bus is to specifyPrimaryand the address of the interface circuit of the device 0.

The information transmitted on the system bus includes data information, address information, and control information. The address bus AB is specifically designed to transfer addresses, since addresses can only be transmitted from the CPU to external memory.

or IO port, so the address bus is always one-way tri-state, which is the same as the data bus.

Different. The number of bits on the address bus determines the amount of memory space that the CPU can address directly.

For example, if the address bus of an 8-bit microcomputer is 16 bits, its maximum addressable space is 2 16 = 64kb, and the 16-bit microcomputer.

The address bus is 20 bits, and its addressable space is 2 20 = 1MB. In general, if the address bus is n bits, the addressable space is 2 n (to the nth power of 2) address spaces (storage units).

How the system bus works

The system bus is in a microcomputer.

is like the central nervous system of the human being.

The CPU reads and writes the contents of the memory through the system bus, and also writes data from the CPU to the peripherals through the bus, or reads the data from the peripherals into the CPU. Microcomputers all have a bus structure. A bus is a set of communication lines used to transmit information.

The microcomputer connects the components together through the system bus, and realizes the information exchange between the components within the microcomputer. In general, the signal provided by the CPU needs to pass through the bus to form a circuit to form a system bus. The system bus is divided into address bus, data bus and control bus according to the function of transmitting information.

A bus is a common data channel for the transmission of information between computer equipment and equipment. The bus is a communication line that connects a variety of devices in a computer hardware system, and an important feature of it is that it is shared by all devices on the bus, and a variety of devices in the computer system can be connected to the bus. If it is a dedicated signal connection between two devices or between devices, it cannot be called a bus.

The buses in the microcomputer are divided into three categories: data bus, address bus and control bus. Different models of CPU chips may have different numbers of data buses, address buses, and control buses. The data bus DB is used to transmit data information and is bidirectional.

The CPU can read data from memory or input devices through the DB, and send internal data to the memory or output devices through the DB. The width of the DB determines the number of bits of data exchanged between the CPU and other devices of the computer at any one time. The address bus AB is used to transmit the address information sent by the CPU and is one-way.

The purpose of sending address information is to indicate the memory unit or IO device with which the CPU exchanges information. Memory is accessed by address, so each memory cell has a fixed address, and to access any cell in 1mb of memory, 1m addresses need to be given, i.e. 20 bits of address (220 = 1m) are required. Therefore, the width of the address bus determines the maximum addressing capability of the CPU.

The control bus CB is used to transmit control signals, timing signals, and status information. Some of these are messages sent by the CPU to memory or external devices, and some are messages sent by memory or external devices to the CPU. Obviously, the direction of information transmission for each line in the CB is certain and one-way, but it is two-way as a whole.

Therefore, in various block diagrams, all control bus CB is represented by bidirectional lines. The performance of the bus directly affects the performance of the whole system, and the development of any system and peripheral modules must comply with the bus specifications adopted. Bus technology continues to develop and improve with the improvement of microcomputer structure.

To put it simply.

In a computer, the bus is the data transmission channel used by all hardware.

Address buses are used for computer addressing, such as memory channels.

A data bus, such as SATA or an ATA channel, is used to transfer data.

The control bus is used to transmit control signals, and the corresponding parts of the computer are the south bridge and the north bridge.

The other buses are one-way channels, while the control buses are bidirectional.