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Synopsys Universal Synchronous/Asynchronous Receiver and Transmitter (USART) is compliant to industry standard 16C550 UART and is available with or without a smartcard interface. The USART has an AMBA® APB bus interface and a standard DMA interface to off-load the CPU.

Synopsys USART's available features are completely software programmable via control registers. The features include enabling of receive and transmit FIFOs, automatic hardware flow control, fractional clock pre-scaling, automatic baud-rate detection, infrared encoding/ decoding, 9-bit multiprocessor/ multidrop mode, full-duplex and single wire half-duplex communication, synchronous and asynchronous transmission/ reception and asynchronous smartcard communication (ISO7816-3).

The USART provides DMA mode data transfers through FIFO trigger levels and receive- and transmit-ready signals. A standard DMA interface is also available. On-board status registers provide the user with error indications, operational status, and modem interface control. System interrupts can be individually enabled/ disabled to meet user requirements. An internal loop-back capability allows on-chip diagnostics.

Highlights & Key Features

Highlights
Highlights + -

  • Key Benefits:
    • Software re-programmable, feature rich USART
    • Low level device driver included
    • Industry standard interfaces (AMBA® APB)
    • Area efficient solution
    • All available configurations in a single bundle
  • USART Supported Functions:
    • Industry standard 16C550 compatible UART
    • Conforms to AMBA APB interface specification
    • Request/ response data flow DMA controller interface
    • Two independent clock domains for APB bus and USART logic
    • Auto-baud functionality for automatically detecting and setting the baud-rate
    • Break character transmission and reception
    • (Automatic) Hardware CTS/ RTS flow control
    • Full modem interface control signals (CTS, RTS, DSR, DTR, RI, DCD)
    • IrDA encoder/ decoder
    • 16-bit integer divider and fractional divider to support non-standard baud-rates
    • Non-standard baud rates at low clock frequencies using variable over sampling
    • Asynchronous wake-up interrupt when system clock is shut down
    • Standard asynchronous error and framing bits (start, stop, parity, overrun and break)
      • 5, 6, 7, or 8-bit characters
      • Even, odd, no-parity
      • 1, 1.5, or 2 stop bits
    • Single wire half-duplex communication
    • Multiprocessor/ Multidrop communication
    • Synchronous master and slave external clock
    • Asynchronous smartcard (ISO7816-3) protocol support
    • Extensive transmit, receive, line-status and data set interrupts independently controlled
    • Programmable FIFO trigger levels
    • Loop-back controls for communication link fault isolation
  • Sample Applications:
    • Smartcard: Smartcards or integrated circuit cards are used for numerous applications including data storage to banking, identification, etc. Combined with software controlled general purpose I/O pins, e.g. using the Virage Logic GPIO IP, the USART provide
    • RS-232: Standard for point-to-point serial binary data communication, typically used for computer serial ports.
    • RS-422/ RS-423/ RS-485: Widely used as an interface for telecommunications, industrial, medical, security and networking applications. RS-422/ RS-423/ RS-485 are extended with multi-drop(RS-422/ RS-423) or multi-point (RS-485) communication to allow multi
    • LIN: The Local Interconnect Network (LIN) is a networking protocol commonly used for
    • automotive network architectures.
    • IrDA: Infrared Data Association, a standard used for communication between devices
    • Bluetooth: Open standard for wireless communication over small distances
    • over a Ultra High Frequency band.
    • Global Positioning System (GPS): Providing reliable positioning navigation and timing services to worldwide users on a continuous basis.

    • Resources

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