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SpaceWire Light
SpaceWire Light
===============
===============
Copyright 2009-2011 Joris van Rantwijk
Copyright 2009-2011 Joris van Rantwijk
 
 
SpaceWire Light is free software; you can redistribute it and/or modify
 
it under the terms of the GNU General Public License as published by
 
the Free Software Foundation; either version 2 of the License, or
 
(at your option) any later version.
 
 
 
SpaceWire Light is distributed in the hope that it will be useful,
 
but WITHOUT ANY WARRANTY; without even the implied warranty of
 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
GNU General Public License for more details.
 
 
 
You should have received a copy of the GNU General Public License along
 
with the SpaceWire Light package. If not, see .
 
 
 
 
 
Overview
Overview
--------
--------
SpaceWire Light is a SpaceWire encoder-decoder.
SpaceWire Light is a SpaceWire encoder-decoder.
It is synthesizable for FPGA targets (up to 200 Mbit on Spartan-3).
It is synthesizable for FPGA targets (up to 200 Mbit on Spartan-3).
Application interfaces include a simple FIFO interface, as well as
Application interfaces include a simple FIFO interface, as well as
an AMBA bus interface for LEON3 system-on-chip designs.
an AMBA bus interface for LEON3 system-on-chip designs.
The goal is to provide a complete, reliable, fast implementation
The goal is to provide a complete, reliable, fast implementation
of a SpaceWire encoder-decoder according to ECSS-E-ST-50-12C.
of a SpaceWire encoder-decoder according to ECSS-E-ST-50-12C.
The core is "light" in the sense that it does not provide additional
The core is "light" in the sense that it does not provide additional
features such as RMAP, routing etc.
features such as RMAP, routing etc.
SpaceWire Light supports two application interfaces. One interface
SpaceWire Light supports two application interfaces. One interface
provides FIFO-style access to RX/TX buffers in the core (spwstream).
provides FIFO-style access to RX/TX buffers in the core (spwstream).
This interface can be easily integrated into most digital designs.
This interface can be easily integrated into most digital designs.
Alternatively, an AMBA bus interface (spwamba) may be used to integrate
Alternatively, an AMBA bus interface (spwamba) may be used to integrate
SpaceWire Light into a LEON3 embedded system. This interface supports
SpaceWire Light into a LEON3 embedded system. This interface supports
DMA-based data transfers. The code for the AMBA interface depends on GRLIB,
DMA-based data transfers. The code for the AMBA interface depends on GRLIB,
a VHDL library from Aeroflex Gaisler. The source of GRLIB must be downloaded
a VHDL library from Aeroflex Gaisler. The source of GRLIB must be downloaded
separately from http://www.gaisler.com/.
separately from http://www.gaisler.com/.
See doc/Manual.pdf for more information.
See doc/Manual.pdf for more information.
 
 
 
License
 
-------
 
 
 
Copyright 2009-2011 Joris van Rantwijk
 
 
 
SpaceWire Light is free software; you can redistribute it and/or modify
 
it under the terms of the GNU General Public License as published by
 
the Free Software Foundation; either version 2 of the License, or
 
(at your option) any later version.
 
 
 
SpaceWire Light is distributed in the hope that it will be useful,
 
but WITHOUT ANY WARRANTY; without even the implied warranty of
 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
GNU General Public License for more details.
 
 
 
You should have received a copy of the GNU General Public License along
 
with the SpaceWire Light package. If not, see .
 
 
 
In addition, the parts of SpaceWire Light which do not depend on GRLIB
 
may be distributed under the terms of the GNU Lesser General Public License
 
as published by the Free Software Foundation; either version 2.1 of the
 
License, or (at your option) any later version.
 
 
 
You should have received a copy of the GNU Lesser General Public License along
 
with the SpaceWire Light package. If not, see .
 
 
 
 
Version history
Version history
---------------
---------------
 
 
 
2011-07-10
 
 * spwamba_test.c: Longer delays to run correctly on 100 MHz LEON3.
 
 * spwltest.c: Allow smaller user-defined block size; skip unnecessery tests.
 
 * License changed to allow LGPL in addition to GPL for non-GRLIB parts.
 
 
2011-02-11
2011-02-11
 * spwamba: Add tick_out signal.
 * spwamba: Add tick_out signal.
 * swprecvfront_fast: Simplified data transfer between clock domains.
 * swprecvfront_fast: Simplified data transfer between clock domains.
 * Clean up synchronization of data paths between clock domains.
 * Clean up synchronization of data paths between clock domains.
2010-12-03
2010-12-03
 * Add RTEMS driver and test program for SPWAMBA.
 * Add RTEMS driver and test program for SPWAMBA.
 * Add documentation for SPWAMBA.
 * Add documentation for SPWAMBA.
 * spwamba: Change TX FIFO management; start new transfer when there is room
 * spwamba: Change TX FIFO management; start new transfer when there is room
   for a maximum burst instead of aiming for 3/4 fill rate.
   for a maximum burst instead of aiming for 3/4 fill rate.
 * spwamba: Do not reset spwxmit in response to software reset.
 * spwamba: Do not reset spwxmit in response to software reset.
 * spwamba: Fix bug in maximum burst size calculation.
 * spwamba: Fix bug in maximum burst size calculation.
 * spwamba: Optimize address generation in burst state machine.
 * spwamba: Optimize address generation in burst state machine.
 * spwamba: More careful calculation of RX credit.
 * spwamba: More careful calculation of RX credit.
2010-09-21
2010-09-21
 * Add AMBA interface (preliminary version, untested, undocumented).
 * Add AMBA interface (preliminary version, untested, undocumented).
 * License changed from LGPL to GPL.
 * License changed from LGPL to GPL.
 * Again fix an issue with EEP injection on link loss.
 * Again fix an issue with EEP injection on link loss.
 * Add DATAPATHONLY keyword to timing constraints.
 * Add DATAPATHONLY keyword to timing constraints.
2010-09-12
2010-09-12
 * Fixed issue with automatic discarding of TX data after link error.
 * Fixed issue with automatic discarding of TX data after link error.
 * After link error, spwstream will terminate current packet with EEP even
 * After link error, spwstream will terminate current packet with EEP even
   if the linkdisable signal is active.
   if the linkdisable signal is active.
 * Added code comment to clarify a dependency between spwrecv and spwlink.
 * Added code comment to clarify a dependency between spwrecv and spwlink.
   (Thanks to Rafael Corsi Ferrao for reporting this obscurity.)
   (Thanks to Rafael Corsi Ferrao for reporting this obscurity.)
2010-07-12
2010-07-12
 * Added manual.
 * Added manual.
 * Fix incorrect bitrate during link handshake. The system clock frequency
 * Fix incorrect bitrate during link handshake. The system clock frequency
   was used to compute the initial tx clock divider, even when the clock
   was used to compute the initial tx clock divider, even when the clock
   divider would act on the txclk instead of the system clock.
   divider would act on the txclk instead of the system clock.
 * Improve fast transmitter. Sending FCT tokens at high bit rate no longer
 * Improve fast transmitter. Sending FCT tokens at high bit rate no longer
   causes insertion of a NULL token.
   causes insertion of a NULL token.
2010-06-08
2010-06-08
 * Initial release.
 * Initial release.
Contact
Contact
-------
-------
For the latest version of this core, see the OpenCores project page.
For the latest version of this core, see the OpenCores project page.
For more information, comments, suggestions or bug reports, either
For more information, comments, suggestions or bug reports, either
go to the OpenCores project page or email me directly.
go to the OpenCores project page or email me directly.
Project page at OpenCores:
Project page at OpenCores:
  http://opencores.org/project,spacewire_light
  http://opencores.org/project,spacewire_light
Email:
Email:
  jvrantwijk (at) xs4all (dot) nl
  joris (at) jorisvr (dot) nl
 
 
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