Description

The D2698 is a Octal UART Core software compatible with the SC2698. The core contains: 3 character receiver FIFO, extended baud rate, programmable receiver and transmitter interrupts. The D2698 Octal Universal Asynchronous Receiver/Transmitter (DUART) is a communications device that provides two full-duplex asynchronous receiver/transmitter channels in a single package. It interfaces directly with microprocessors and may be used in a polled or interrupt driven systems and provides modem interface. The operating mode and data format of each channel can be programmed independently. Additionally, each receiver and transmitter can select its operating speed as one of 26 fixed baud rates, a 16X clock derived from a programmable counter/timer, or an external 1X or 16X clock. The baud rate generator and counter/timer can operate directly from external clock inputs. The ability to independently program the operating speed of the receiver and transmitter make the UART particularly attractive for dual-speed channel applications such as clustered terminal systems.

Key features

  • Software compatible with SCC2698 UART
  • Configuration capability
  • 8 full-duplex independent asynchronous receiver/transmitters
  • 3 character FIFOs for each receiver channel
  • Programmable data format:
    • 5 to 8 data bits plus parity
    • Odd, even, no parity or force parity
    • 1, 1.5 or 2 stop bits programmable in 1/16-bit increments
  • 16-bit programmable Counter/Timer
  • Programmable baud rate for each receiver and transmitter selectable from:
    • 26 fixed rates: 50 to 115.2k baud
    • Programmable user-defined rates derived from a programmable counter/timer
    • External 1X or 16X clock
  • Parity, framing, and overrun error detection
  • False start bit detection
  • Line break detection and generation
  • Programmable channel mode:
    • Normal (full-duplex)
    • Automatic echo
    • Local loopback
    • Remote loopback
  • 2 Multi-function input and 2 I/O ports:
    • Can serve as clock, modem, or control inputs
    • Change of state detection on four inputs
  • Multi-function output port:
    • Individual bit set/reset capability
    • Outputs can be programmed to be status/interrupt signals
    • FIFO states for DMA and modem interface
  • Versatile interrupt system:
    • Single interrupt output with eight maskable interrupting conditions
    • Output port can be configured to provide a total of up to six separate wire-ORable interrupt outputs
    •  Each FIFO can be programmed for four different interrupt levels
    • Watchdog timer for each receiver
  • Maximum data transfer rates: 1X – 1Mb/sec, 16X – 1Mb/sec
  • Start-end break interrupt/status
  • Detects break which originates in the middle of a character
  • Power down mode
  • Receiver timeout mode

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