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# FPGA Configuration Space Specification
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# FPGA Configuration Space Specification (also known as SDB)
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This project is an effort to introduce a configuration space
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specification for internal FPGA buses (interconnects, crossbars). Our
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initial target is Wishbone, but the specification is generic. The output
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of this project is called SDB (self describing bus) even if the project
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of this project is called SDB (Self Describing Bus) even if the project
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(thus the repository) is called fpga-config-space.
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SDB allows to enumerate the cores that are live in the current fpga
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binary, either from the host computer or from the internal soft-core CPU
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in the FPGA itself.
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in the FPGA itself. It is also used as a simple filesystem in our EEPROM
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devices,
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so data can be easily accessed by both the host and the soft core that
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lives in the FPGA itself.
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The current specification is already in use in some of our designs. And
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we have some [sdb implementation
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| ... | ... | @@ -16,8 +19,8 @@ guidelines](sdb-implementation-guidelines) |
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## Specification
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Version 1.0 of SDB the specification is available in [PDF
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format](https://www.ohwr.org/project/fpga-config-space/wikis/Documents/SDB-specification-June-2012), together with the header
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Version 1.1 of SDB the specification is available in [PDF
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format](https://www.ohwr.org/project/fpga-config-space/wikis/Documents/SDB-1.1-specification), together with the header
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file.
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It has been built from the repository of this project, so you can get
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the git tree instead and run Latex on it.
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| ... | ... | @@ -37,34 +40,22 @@ The implementation as VHDL is part of the respective projects |
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Code for the Linux kernel (both as a bus driver and a file system
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driver) is being written. Available code
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is part of this repository, but it's still work in progress.
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is part of this repository, but it's still work in progress. Sdbfs is
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being used in our EEPROMs using
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the user-space tools and library currently in the "sdbfs" subdir of the
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repository
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## Status
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<table>
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<tbody>
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<tr class="odd">
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<td><strong>Date</strong></td>
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<td><b> Event </b></td>
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</tr>
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<tr class="even">
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<td>09-05-2011</td>
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<td>Start of project</td>
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</tr>
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<tr class="odd">
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<td>09-05-2011</td>
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<td>Added draft of specification (available in Repository section)</td>
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</tr>
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<tr class="even">
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<td>10-05-2011</td>
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<td>Added code for wishbone simulator (source code available in Repository or Files section)</td>
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</tr>
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<tr class="odd">
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<td>21-06-2012</td>
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<td>After long discussions, the specification is published</td>
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</tr>
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</tbody>
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</table>
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-----
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| **Date**| \* Event \*|
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| 09-05-2011 | Start of project |
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| 09-05-2011 | Added draft of specification (available in Repository
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section) |
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| 10-05-2011 | Added code for wishbone simulator (source code available
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in Repository or Files section) |
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| 21-06-2012 | After long discussions, the specification is published
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| 11-04-2013 | Version 1.1 of the sdb specification, including sdbfs
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material and more |
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\---
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