T1 Framer/Deframer - ntT1_G704

Noesis Technologies ntT1_G704 Framer/Deframer is designed for T1 networks and is compliant with ITU recommendations G.704, G.706, G.732, G.775 and O.163. The core provides all the necessary data formatting transforms for transmission over an T1 carrier. T1 is one of the two most widely used TDM (time division multiplexing) carriers incorporating 24 channels, each with a bandwidth of 64 kbps providing a total payload bit rate of 1536 kbps. The ntT1_G704 IP core provides a flexible interface supporting hardware and microprocessor modes. Specifically the core can be connected to a host system either through an 8-bit parallel microprocessor interface (HP mode) or through a set of I/O ports (HW mode). When in HP mode, the micro-processor configures and monitors the functionality of the core through a rich set of registers. When in HW mode, the core is directly controlled and monitored through a set of dedicated ports and no microprocessor control is necessary. At the transmit side, the framer generates framing patterns, CRC6 bits, formats outgoing and signalling data, generates alarms and clock outputs for data conditioning and decoding. At the receive side, the deframer establishes frame / multiframe synchronization, extracts data, signalling and alarm flags. It provides information like frame, multiframe alignment, calculates CRC6 and counts CRC6 errors.

The ntT1_G704 core can be used in primary rate digital trunk interfaces, computer to PBX interfaces (CPI and DMI), to any high speed computer-to-computer data link and generally, to any digital cross connect interface.

  • T1 framer/deframer compliant to G.704, G.706, G.732, G.775 and O.163 CCITT recommendations.
  • Supports common framing standards.
    – 12 frames/superframe ‘193’
    – 24 frames/superframe ‘193E’
  • Supports CRC6/non-CRC6 cases.
  • Three zero suppression modes: B7 stuffing, B8ZS and transparent.
  • User configurable receive and transmit control.
  • Supports 8-bit parallel microprocessor interface for device configuration and control in host processor mode.
  • Hardware control mode requires no host processor; ideal for stand-alone applications.
  • Supports loop-back mode.
  • Alarm generation, alarm detection and error logging.
  • Compatible with Dallas DS2186 transmit line interface.
  • Fully synchronous design.
  • Silicon proven in ASIC and FPGA technologies for a variety of applications.

The core has been targeted to both ASIC and FPGA technologies for various applications. Noesis Technologies can also deliver netlist versions of the core optimized to specific area resources and performance requirements..

Silicon VendorDeviceResourcesFmax
XilinxSpartan 3798 CLB Slices /
12 Block RAMs
101 (clk_tx)
100 (clk_rx)
TSMC0.18 um7050 gates /
4632 RAM bits
432 (clk_tx)
350 (clk_rx)

Noesis has engaged an “open” licensing philosophy in order to allow maximum technology transfer to our client’s engineering teams and to facilitate the integration of our IP cores into our client’s product. Various licensing models are available. The ntT1_G704 core is available as a soft core (synthesizable HDL) or as a firm core (netlist for FPGA technologies). The following deliverables are included:

  • Fully commented synthesizable VHDL or Verilog source code or FPGA netlist.
  • VHDL or Verilog test benches and example configuration files.
  • Comprehensive technical documentation.
  • Technical support.

We offer a variety of IP Core evaluation options such as C++, Matlab bit-true reference models, encrypted RTL simulation models with standalone, self-checking, fully automated RTL test benches, time limited FPGA netlists as well as FPGA demo boards for real-time verification.

Contact us to request further IP Core product information.