Murrelektronik MVK+ MPNIO DI8 DO8 IRT Push Pull Part No. Murr 55529 Murr bus module distribution

Murr 55529 bus module is the common communication backbone for transmitting information between various functional components of a computer. It is a transmission bundle composed of wires. According to the types of information transmitted by the computer, computer buses can be divided into data buses, address buses, and control buses, used respectively for transmitting data, data addresses, and control signals. A bus is an internal structure; it is the common channel for information transfer between the cpu, memory, input, and output devices. The various components of the host are connected via the bus, and external devices are connected to the bus through corresponding interface circuits, thereby forming the computer hardware system. In a computer system, the common path for transmitting information between components is called the bus. Microcomputers connect various functional components using a bus structure. In this bus topology network structure, all devices are directly connected to the bus. The medium used is generally coaxial cable (including thick and thin cables), although optical fiber is now also used as a bus-type transmission medium. For example, the ATM network and the networks used by Cable Modem belong to the bus-type network structure. Bus module

Murr 55529 bus module features

1. The dual-bus structure oriented toward memory offers high information transmission efficiency, which is its main advantage. However, conflicts still occur when the CPU and I/O interfaces both need to access memory. 2. The CPU connects to high-speed local memory and local I/O interfaces via a high-transmission-rate local bus, while slower global memory and global I/O interfaces connect to a slower global bus. This balances high-speed and slow-speed devices, preventing them from interfering with each other. 3. Simplifies hardware design. It facilitates modular structural design methods. For bus-oriented microcomputer design, one only needs to manufacture cpu plug-in cards, memory plug-in cards, and I/O plug-in cards according to these specifications. Connecting them to the bus allows them to operate without considering the detailed operations of the bus. 4. Simplifies system structure. The overall system structure is clear. There are fewer connections, and backplane wiring can be printed. 5. Good system expandability. First, scale expansion merely requires inserting more plug-in cards of the same type. Second, function expansion merely requires designing new plug-in cards according to bus standards. The position where the plug-in card is inserted into the machine often has no strict limitations. 6. Good system update performance. Because the cpu, memory, I/O interfaces, etc., are connected to the bus according to bus protocols, as long as the bus design is appropriate, new plug-in cards can be designed at any time in line with advancements in processor chips and other related chips. Inserting the new plug-in card into the backplane updates the system, and other plug-in cards and backplane wiring generally do not need to be changed. 18. Facilitates fault diagnosis and maintenance. Using a motherboard test card allows for easy identification of faulty parts and bus types.

Murr 55529 bus module classification

Common data buses include ISA (ISA bus), EISA, VESA, PCI, etc. "Address bus AB" is dedicated to transmitting addresses. Since addresses can only be transmitted from the CPU to external memory or I/O ports, the address bus is always unidirectional and tri-state, which differs from the data bus. The bit width of the address bus determines the size of the memory space that the CPU can directly address. For example, if the address bus of an 8-bit microcomputer is 16 bits, its maximum addressable space is 2^16=64KB. The address bus of a 16-bit microcomputer (x-bit processor refers to the number of bits (1, 0) that the microprocessor can process in one clock cycle, i.e., the word length) is 20 bits, and its addressable space is 2^20=1MB. Generally, if the address bus is n bits, the addressable space is 2^n bytes. "Control bus CB" is used to transmit control signals and timing signals. Among control signals, some are sent by the microprocessor to memory and I/O interface circuits, such as read/write signals, chip select signals, and interrupt response signals; others are fed back to the CPU by other components, such as interrupt request signals, reset signals, bus request signals, and device ready signals. Therefore, the transmission direction of the control bus depends on the specific control signal; (information) is generally bidirectional. The bit width of the control bus is determined by the actual control needs of the system. In practice, the specific situation of the control bus mainly depends on the CPU. Classified by data transmission method, buses can be divided into serial buses and parallel buses. In serial buses, binary data is sent bit by bit through a single data line to the destination device; parallel buses typically have more than 2 data lines. Common serial buses include SPI, I2C, USB, and RS232. Classified by whether the clock signal is independent, buses can be divided into synchronous buses and asynchronous buses. The clock signal of a synchronous bus is independent of the data, whereas the clock signal of an asynchronous bus is extracted from the data. SPI and I2C are synchronous serial buses, while RS232 uses an asynchronous serial bus.

Murr 55529 bus module operation

A bus operation process completes the transmission of information between two modules. The master module initiates the operation process, and the other is the slave module. At any given moment, only one master module can occupy the bus. Bus operation steps: The master module requests bus control, and the bus controller makes the arbitration. Bus operation steps: After obtaining bus control, the master module addresses the slave module, and data transmission occurs after confirmation by the slave module. Error checking for data transmission. Bus timing protocols: Timing protocols ensure synchronized operation and correct transmission between both parties of the data transfer. There are three types of timing protocols: Synchronous bus timing: All modules on the bus share the same clock pulse for controlling the operation process. All actions of each module occur at the beginning of the clock cycle, and most actions are completed within one clock cycle. Asynchronous bus timing: The occurrence of an operation is determined by specific signals from the source or destination module. The occurrence of an event on the bus depends on the occurrence of the previous event, with both parties providing handshake signals to each other. Semi-synchronous bus timing: The time intervals between operations on the bus can vary but must be integer multiples of the clock cycle. Signal appearance, sampling, and termination are still based on the common clock. ISA bus adopts this timing method. Data transmission types: Divided into single-cycle mode and burst (burst) mode. Single-cycle mode: Only one data item is transmitted per bus cycle. Burst mode: Multiple data items are transmitted after obtaining master line control. Provided during addressing.

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