Murrelektronik MVK-MPNIO DIO16 IRT 7/8" 5pin Part No. Murr 55530 Murr bus module distribution

Murr 55530 bus module is a shared data transmission device. Although multiple devices can be connected to the bus, typically only one pair of devices participates in data transmission at any given time. According to the form of information transmission, buses can be divided into parallel buses and serial buses. A parallel bus transmits n bits of binary information simultaneously using n transmission lines. Its characteristics include high transmission speed, but the system structure is more complex; it is used for connections between various components within a computer system. A serial bus shares a single transmission line for multi-bit binary information, with the multi-bit binary information passing through the bus in chronological order. Its characteristics include simple structure, but its transmission speed is slower. The bus must have clear specifications: Bus timing protocol, meaning that certain timing rules must be followed when transmitting information on the bus, such as synchronous bus timing, asynchronous bus timing, and semi-synchronous bus timing. Physical characteristics of the bus, including electrical characteristics of signals, power, and addresses, as well as mechanical characteristics of wiring and connectors. Bus bandwidth, which is the maximum transmission rate achievable by the bus, with the unit being MB/S. Bus module

Murr 55530 bus module features

Since the bus is a group of signal lines connecting various components. Information is represented by signals on the signal lines, and how operations are implemented is agreed upon by defining the sequence of different signals. The characteristics of the bus are as follows: 1) Physical characteristics: Physical characteristics, also known as mechanical characteristics, refer to some characteristics exhibited by components on the bus during physical connection, such as geometric dimensions, shape, number of pins, and arrangement order of plugs and sockets. 2) Functional characteristics: Functional characteristics refer to the function of each signal line. For example, the address bus is used to represent address codes. The data bus is used to represent transmitted data, and the control bus represents commands, states, etc., for operations on the bus. 3) Electrical characteristics: Electrical characteristics refer to the signal direction on each signal line and the voltage range representing valid signals. Typically, signals sent by the master device (such as CPU) are called output signals (OUT), and signals sent into the master device are called input signals (IN). Usually, data signals and address signals define high level as logic 1 and low level as logic 0. There is no customary convention for control signals; for example, WE indicates active low, and Ready indicates active high. There is no unified regulation for the voltage ranges of high and low levels on different buses; they usually conform to TTL. 5) Timing characteristics: Timing characteristics, also known as logical characteristics, refer to when signals on each signal line are valid during bus operation. By agreeing on the timing relationship of these valid signals, correct bus operation is ensured. To improve the scalability of computers and the universality of components and devices, except for on-chip buses, various components or devices are connected to the bus in a standardized form, and information transmission on the bus is implemented in a standardized way. These standardized connection forms and operation methods of the bus are collectively referred to as bus standards. Such as ISA, PCI, USB bus standards, etc. Correspondingly, buses adopting these standards are ISA bus, PCI bus, USB bus, etc.

Murr 55530 bus module classification

Common data buses include ISA (ISA bus), EISA, VESA, PCI, etc. "Address bus AB" is specifically used to transmit addresses. Since addresses can only be transmitted from CPU to external memory or I/O ports, the address bus is always unidirectional and tri-state, which differs from the data bus. The number of bits in the address bus determines the size of the memory space that CPU can directly address. For example, if the address bus of an 8-bit microcomputer is 16 bits, then 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 size) is 20 bits, and its addressable space is 2^20=1MB. Generally speaking, 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, interrupt response signals, etc.; others are feedback signals from other components to CPU, such as interrupt request signals, reset signals, bus request signals, device ready signals, etc. Therefore, the transmission direction of the control bus is determined by the specific control signal, and (information) is generally bidirectional. The number of bits in the control bus depends on the actual control needs of the system. In fact, the specific situation of the control bus mainly depends on CPU. According to the method of data transmission, it can be divided into serial buses and parallel buses. In a serial bus, binary data is sent bit by bit to the destination device through a single data line; parallel buses typically have more than 2 data lines. Common serial buses include SPI, I2C, USB, and RS232. According to whether the clock signal is independent, it can be divided into synchronous buses and asynchronous buses. The clock signal of a synchronous bus is independent of the data, while the clock signal of an asynchronous bus is extracted from the data. SPI and I2C are synchronous serial buses, and RS232 uses an asynchronous serial bus.

Murr 55530 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 time, 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 protocol: Timing protocols ensure synchronized operation and correct transmission between both parties of 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, and both parties provide 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. The appearance, sampling, and ending of signals 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 in one bus cycle. Burst mode: Multiple data items are transmitted after obtaining main line control. Provided during addressing.

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