Dec 05, 2015 synchronous serial interface is a widely used serial interface standard for industrial applications between a master and a slave. Examples of synchronous interfaces include spi, and i2c. Synchronous serial interface ssi is a widely used serial interface standard for industrial applications between a master e. Interface ip usb pci express ddr mipi cxl ccix highspeed serdes phys ethernet dietodie hdmi mobile storage bluetooth multi protocol phys vesa dsc ip prototyping kits interface ip subsystems apr 29, 2019 the synchronous type of serial protocols such as spi, i2c, can and lin are used in different projects because it is one of the best resources for onboard peripherals. The first function is the wellknown asynchronous communication protocol uart. Official title for the standard is interface between dte and dce employing serial binary data interchange mechanical specification specifics of the connector, assignment of interchange circuits to pins, size, dimensions, etc. Universal synchronous asynchronous receivetransmit usart. Uart is an asynchronous protocol while i 2 c and spi are synchronous protocols. Serial synchronous interface ssi serial synchronous interface is a widely used serial interface between a. Ssi can support a variety of protocols in which data is transmitted depending on the. Spi interface bus is commonly used for interfacing. Needs driver for level shifting rs 232 communications to a pc serial port usart stands for universal synchronous asynchronous receiver transmitter.
A synchronous serial interface always pairs its data lines with a clock signal, so all devices on a synchronous serial bus share a common clock. Industry is a sector of the economy, which is divided into many branches. Serial communications many fewer lines are required to transmit data. To specify a synchronous serial interface and enter interface configuration mode, use the following commands in global configuration mode. Plc, microcontroller or other control systems to a slave e. Ssi synchronous serial interface master application note. The synchronous serial interface ssi provided a data transmission on sixwire cable with signals rs422 compatible. The synchronous serial port ssp module is a serial interface useful for.
Serial vs parallel interface newhaven display international. In spi, separate wires are required for data and clock line. Ssi is based on rs422 standards and has a high protocol efficiency in. Each task in the list is identified as either required or optional. Pdf a highspeed synchronous serial communication interface between arm and dsp. Serial peripheral interface spi full duplex, synchronous serial data transfer data is shifted out of the masters mega128 mosi pin and in its miso pin data transfer is initiated by simply writing data to the spi data register. The serial peripheral interface spi is a synchronous serial communication interface specification used for shortdistance communication, primarily in embedded systems. Synchronous operation uses a clock and data line while there is no separate clock. The serial interface acts as a communication interface between two digital systems that sends data as a series of voltage pulses over a wire. It is sometimes called the serial communications interface or sci. Serial vs parallel interface serial interface one bit at a time parallel interface multiple bits at a time newhaven display international has lcds, tfts and oleds that offer both modes. Asynchronous startstop is the lower datalink layer used to connect computers to modems for many dialup internet access applications, using a second encapsulating data link framing protocol such as ppp to create packets made up out of asynchronous serial characters. A serial interface is a communication interface that transmits data as a single stream of bits, typically using a wireplusground cable, a single wireless channel or a wirepair.
The synchronous serial port ssp module is a serial interface useful for communicating with other peripherals or microcontroller devices. The following sections will cover a brief description about the ssi protocol and discuss the hardware and software implementations in detail. The sl504 also supports the rs232 electrical standard. Ssi compatible serial code s3 serial synchronous interface ssi data transmission sequence 1. Cisco 800 series integrated services routers software. Serial peripheral interface or spi is a synchronous serial communication protocol that provides full duplex communication at very high speeds. This interface supports fullduplex operation at t1 1. Ssi is based on rs422 standards and has a high protocol.
May 03, 2018 configuring a synchronous serial interface. Understand general synchronous serial communication concepts. The next text described basic properties of ssi interface and protocol. Pdf synchronous serial communication between at91rm9200. The synchronous serial port ssp module is a serial interface useful for communicating with. The devices exchange a bit of data every time the clock changes. Point io synchronous serial interface absolute encoder module 5 publication 1734in581eene october 2015 european hazardous location approval the following applies when the product bears the ex marking this equipment is intended for use in potentially explosive atmospheres as defined by european union directive 949ec. Position data is continually updated by the sensor and made available to the shift register. It has synchronous serial communication data link that operates in full. Synchronous serial communication protocols feature a controller device which sends a clock pulse to one or more peripheral devices.
In an asynchronous protocol, the clock signal is not transmitted along with the data. There are two common forms of synchronous serial, interintegrated circuit, or i2c sometimes also called twowire interface, or twi, and serial. The serial peripheral interface spi is a synchronous interface which allows several spi microcontrollers to be interconnected. The synchronous serial interface is a digital interface for absolute position and rotary measuring systems. Keystone architecture serial peripheral interface spi user guide. Synchronous serial port or the master synchronous serial port. This application note describes in detail on how to implement a synchronous serial interface ssi master using an atmel atmega88 controller. Some rs232 connections using handshaking lines between. Also the clock is not included in the data stream and must be furnished as a separate signal. Synchronous serial communication tutorial the basics of. Using synchronous audio interface sai on s32k148using synchronous audio interface sai on s32k148, rev. A multi interface lcd board is designed to display information on the lcd using different parallel or serial protocol interfaces.
The ssi is a fullduplex synchronous serial interface and can connect to a variety of external analogtodigital ad converters, audio and telecom codecs, and other devices that use serial protocols for transferring data. This interface makes it possible to create a serial data transfer where absolute information concerning a position is transferred. This section describes the serial communication interface usart. The ssi supports nationals microwire, texas instruments. In the original specification multiple transmissions were used to ensure data integrity. Ssi uses a clock pulse train from a controller to initiate a gated output from the sensor. The serial peripheral interface spi module is a synchronous serial interface useful. Synchronous serial interface ssi is a widely used serial interface standard for industrial applications especially, rotary encoders. Ssi is based on rs422 standards and has a high protocol efficiency in addition to its implementation over various hardware platforms, making it very popular among sensor manufacturers. Codec mode leftright justified codec mode can be compared with i2s protocol but word select is asserted at the same time that first.
The 32bit variant introduced by the lpc bus specification, are not present in espi. Ssi serial synchronous interface is a widely used serial interface between an absolute position sensor and a controller. An12202, using synchronous audio interface sai on s32k148. The boards differ in the serial protocols they support. Synchronous serial interfaces are supported on various serial network interface cards or systems. Serial peripheral interface spi for keystone devices user s. Whoever controls the clock controls communication speed. Spi interface is available on popular communication controllers such as pic, avr, and arm controller, etc.
This means that the receiver cannot independently synchronize its reading of the data line with the transmitters transmission rate. Typical applications include secure digital cards and liquid crystal displays. Serial peripheral interface spi is a master slave type protocol that provides a simple and low cost interface between a microcontroller and its peripherals. Synchronous serial interface ssi ist eine schnittstelle fur absolutwertgeber wegmesssysteme. So intermediate user who already has some idea about serial data transfer can skip this tutorial and jump directly to spi or i2c tutorials. Also these are the widely used protocols in major applications. The tutorial is aimed for a beginner who has no experience or any idea of serial communication. The serial peripheral interface spi is a synchronous interface which allows several spi. Although these branches at first sight may look very different, in most cases they have one thing in common. It enables position and angular information to be transmitted digitally, absolutely and without bus overhead. C peripheral clock cs synchronous communications requires clock. This section of the manual contains the following major topics.
Main features configured for one axis measurements 0 360. Become familiar with the serial peripheral interface spi serial communication protocol and with the spi system available within the atxmega128a1u. The synchronous serial interface ssi with its rs422 differential line drivers allows transmission cable length up to 1200m. In a synchronous protocol, the clock signal is transmitted along with the data, so it is easy for the receiving end to decode the data received. The spi communication stands for serial peripheral interface communication protocol, which was developed by the motorola in 1972. This makes for a more straightforward, often faster serial transfer, but it also requires at least one extra wire between communicating devices. Both parallel and serial communications have handshaking requirements to synchronize data transfers. Slave select may or may not be used depending on interfacing device. Controller provides a series of pulses or differential pulse pairs on the clock input lines. These peripheral devices may be serial eeproms, shift registers, display drivers, ad converters, etc.
Synchronous serial communication devices united electronic. Jun 20, 2017 introduction serial peripheral interface or spi is a synchronous serial communication protocol that provides full duplex communication at very high speeds. The most common physical layer interface used is rs232d. It has two functions implemented, to allow serial communication working in different ways. Interface ip usb pci express ddr mipi cxl ccix highspeed serdes phys ethernet dietodie hdmi mobile storage bluetooth multi protocol phys vesa dsc ip prototyping kits interface ip subsystems protocol as an spi master with cpol0, cpha0, and. Synchronous protocol an overview sciencedirect topics. Ssi synchronous serial interface master application note posital. The receiver needs some help and that help comes in the form of a clock signal that is shared by the transmitter. Appendix a gives an overview of the i2c bus specification.
Output driver of the encoder is a max 491 transceiver in transmit mode. Learn how to utilize the spi protocol to interface with an external inertial measurement unit imu sensor package. The usart peripheral interface is built to support, with one hardware configuration, two different serial protocols. Serial peripheral interface spi is an interface bus commonly used to send data between microcontrollers and small peripherals such as shift registers, sensors, and sd cards. Although parallel communications generally has a speed advantage over serial communications, the primary advantage for serial communications is the reduced number of processor io pins and connecting wires or conductors. This document provides a basic discussion of the ftdi mpsse, how to configure it for use and. The simple protocol makes it easy to connect the sensor to common plc systems or embedded controllers. In a synchronous serial interface, the receiver has no internal clock. This tutorial give you the details of synchronous serial communication, which is the basis of data transfer in communication standards like spi and i2c. This section of the tutorial will introduce you to spi and its concepts. Serial peripheral interface spi communication protocol. Serial peripheral interface spi oregon state university. Synchronous serial board overview the sl504, ct602804, and sl514 all send and receive data as bit streams, with bit transmission and reception synchronized to a common serial clock signal. The recommended receiver is a max 491 transceiver in receive mode.
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