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SpaceWire Light
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===============
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Copyright 2009-2011 Joris van Rantwijk
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SpaceWire Light is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SpaceWire Light is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with the SpaceWire Light package. If not, see .
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Overview
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--------
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SpaceWire Light is a SpaceWire encoder-decoder.
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It is synthesizable for FPGA targets (up to 200 Mbit on Spartan-3).
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Application interfaces include a simple FIFO interface, as well as
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an AMBA bus interface for LEON3 system-on-chip designs.
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The goal is to provide a complete, reliable, fast implementation
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of a SpaceWire encoder-decoder according to ECSS-E-ST-50-12C.
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The core is "light" in the sense that it does not provide additional
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features such as RMAP, routing etc.
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SpaceWire Light supports two application interfaces. One interface
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provides FIFO-style access to RX/TX buffers in the core (spwstream).
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This interface can be easily integrated into most digital designs.
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Alternatively, an AMBA bus interface (spwamba) may be used to integrate
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SpaceWire Light into a LEON3 embedded system. This interface supports
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DMA-based data transfers. The code for the AMBA interface depends on GRLIB,
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a VHDL library from Aeroflex Gaisler. The source of GRLIB must be downloaded
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separately from http://www.gaisler.com/.
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See doc/Manual.pdf for more information.
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Version history
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---------------
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2011-02-11
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 * spwamba: Add tick_out signal.
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 * swprecvfront_fast: Simplified data transfer between clock domains.
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 * Clean up synchronization of data paths between clock domains.
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2010-12-03
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 * Add RTEMS driver and test program for SPWAMBA.
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 * Add documentation for SPWAMBA.
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 * spwamba: Change TX FIFO management; start new transfer when there is room
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   for a maximum burst instead of aiming for 3/4 fill rate.
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 * spwamba: Do not reset spwxmit in response to software reset.
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 * spwamba: Fix bug in maximum burst size calculation.
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 * spwamba: Optimize address generation in burst state machine.
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 * spwamba: More careful calculation of RX credit.
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2010-09-21
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 * Add AMBA interface (preliminary version, untested, undocumented).
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 * License changed from LGPL to GPL.
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 * Again fix an issue with EEP injection on link loss.
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 * Add DATAPATHONLY keyword to timing constraints.
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2010-09-12
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 * Fixed issue with automatic discarding of TX data after link error.
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 * After link error, spwstream will terminate current packet with EEP even
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   if the linkdisable signal is active.
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 * Added code comment to clarify a dependency between spwrecv and spwlink.
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   (Thanks to Rafael Corsi Ferrao for reporting this obscurity.)
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2010-07-12
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 * Added manual.
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 * Fix incorrect bitrate during link handshake. The system clock frequency
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   was used to compute the initial tx clock divider, even when the clock
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   divider would act on the txclk instead of the system clock.
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 * Improve fast transmitter. Sending FCT tokens at high bit rate no longer
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   causes insertion of a NULL token.
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2010-06-08
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 * Initial release.
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Contact
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-------
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For the latest version of this core, see the OpenCores project page.
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For more information, comments, suggestions or bug reports, either
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go to the OpenCores project page or email me directly.
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Project page at OpenCores:
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  http://opencores.org/project,spacewire_light
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Email:
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  jvrantwijk (at) xs4all (dot) nl
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