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FireLink® LLC IP Core

The synthesizable IEEE-1394-2008 Beta Link Layer Controller (LLC) Core, FireLink®, is based on the Link Layer Controller that has been used for several years in the FireSpy® analyzers products by DapTechnology. FireLink®, which was developed using VHDL and is a mature Core that has been implemented in Xilinx, Altera and Microsemi FGPAs. FireLink® is offered in three configurations, i.e. Basic, Extended and Extended with AS5643 protocol support.

Currently, the LLC provides the control for transmitting and receiving 1394 packets, including asynchronous packets, isochronous packets and PHY packets, at speeds up to S3200.

As a special option, the FireLink LLC offers Firmware Support for the AS5643 protocol. While current implementations require significant host SW support, FireLink® with AS5643 support off-loads the host SW requirements by making the hardware AS5643 timing-aware which produces significantly better timing as well as reduced host resource utilization. Examples of typcial applications in aerospace & defense for the FireLink® include command & control systems for space-based vehicles, missile guidance platforms, fighter aircraft flight control, as well as its implementation in avionics & IFE platforms for business and commercial aircraft.

Products

Basic Version Status: Active
Partnumber: LLC800-RPL-Basic
Extended Version Status: Active
Partnumber: LLC800-RPL_Extended
Mil1394 Extended Version Status: Active
Partnumber: LLC800-RPL_Extended_Mil1394

Common Features

Host Bus Interface

  • Generic: A generic 32-bit synchronous host bus.
  • OPB: A 32-bit synchronous bus used in Xilinx FPGAs for their MicroBlaze and PowerPC processors.
  • Avalon: A 32-bit synchronous bus used in Altera FPGAs for their NIOS processor.
  • PLB

The Basic version is implemented as a slave-only bus interface while the Extended version, however, will utilize a DMA engine which will access the bus as a Master.

Control Status
Both versions have a number of registers that can be written and or read. They are used to control the Link Layer Controller and to check its status. For the Extended version, control for the DMA engine is also provided.

CRC Calculation/Verification
Data and Header CRC are automatically added for Outgoing Packets. CRCs are verified for incoming packets. Faulty packets are ignored. Additionally errors can be injected for TX packets (header and or data CRC).

Ack Generation
Acknowledge Packet Generation is based on incoming packet content, available buffer space as well as LLC state. As an added feature Acknowledges can be suppressed or erroneous Ack codes can be injected.

Filtering
NodeID (async) and channel number (iso) specific packet filter engine.

Cycle Start Generation (optional)
A Cycle Start Packet generation functionality with its associated Cycle_Time Register is optionally supported by the HW.

ISO Ports (optional)
Optionally, ISO Receive and/or ISO Transmit ports can be added. The purpose of these ports is to connect dedicated stream HW (e.g.: image/video generating/receiving HW) for the handling of data streams without burdening the host processor. Received and Transmitted isochronous packets can be routed through the ISO Ports therefore providing a dedicated and highly efficient data path for the isochronous packets. Optionally the packet headers will be skipped (RX) or automatically generated (TX).

Monitor (optional)
Optionally, a packet monitor is supported. This tool is mainly targeted for debugging purposes.


 
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