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| .. SAP-SMD documentation master file, created by | ||
| sphinx-quickstart on Thu Jan 16 15:52:38 2025. | ||
| You can adapt this file completely to your liking, but it should at least | ||
| contain the root `toctree` directive. | ||
| SAP-SMD documentation | ||
| ===================== | ||
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| Add your content using ``reStructuredText`` syntax. See the | ||
| `reStructuredText <https://www.sphinx-doc.org/en/master/usage/restructuredtext/index.html>`_ | ||
| documentation for details. | ||
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| .. toctree:: | ||
| :maxdepth: 2 | ||
| :caption: Contents: | ||
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| modules/instruction_decoder |
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| .. _instruction_decoder: | ||
| .. index:: Instruction Decoder | ||
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| Instruction decoder | ||
| =================== | ||
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| The instruction decoder is reponsible for mapping a machine instruction together | ||
| with the t-state counter to the control lines. The instruction decoder in the | ||
| SAM-SMD uses two :code:`SST39SF010` EEPROMS for this mapping. One of the EEPROMS | ||
| directs 8 parallel control lines, which are lines that can be pulled high or low | ||
| in any particular combination. The second EEPROM is tied to four :code:`74HC238` | ||
| which control 2 x 15 orthogonal control lines. Orthogonal control lines are such | ||
| that only one of the 15 lines can be activated at one time. This limitation | ||
| comes with the benefit that a single chip can control far more control lines, | ||
| here 30 instead of 8. Note that the 2 x 15 orthogonal control lines form two | ||
| sets, i.e. any control line in one set **can** be activated together with any | ||
| other control line in the other set. The only limitation is thus that **within** | ||
| a set, no two control lines can be activated simultaneously. | ||
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| Mapping | ||
| ------- | ||
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| .. list-table:: Parallel Control Lines | ||
| :widths: 20, 20, 60 | ||
| :header-rows: 1 | ||
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| * - Control line | ||
| - Code | ||
| - Description | ||
| * - :code:`PCL0` | ||
| - CODE000 | ||
| - Description for control line 0. | ||
| * - :code:`PCL1` | ||
| - CODE001 | ||
| - Description for control line 1. | ||
| * - :code:`PCL2` | ||
| - CODE002 | ||
| - Description for control line 2. | ||
| * - :code:`PCL3` | ||
| - CODE003 | ||
| - Description for control line 3. | ||
| * - :code:`PCL4` | ||
| - CODE004 | ||
| - Description for control line 4. | ||
| * - :code:`PCL5` | ||
| - CODE005 | ||
| - Description for control line 5. | ||
| * - :code:`PCL6` | ||
| - CODE006 | ||
| - Description for control line 6. | ||
| * - :code:`PCL7` | ||
| - CODE007 | ||
| - Description for control line 7. | ||
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| .. list-table:: Orthogonal Control Lines A | ||
| :widths: 20, 20, 60 | ||
| :header-rows: 1 | ||
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| * - Control line | ||
| - Code | ||
| - Description | ||
| * - :code:`OCA1` | ||
| - CODE001 | ||
| - Description for control line 1. | ||
| * - :code:`OCA2` | ||
| - CODE002 | ||
| - Description for control line 2. | ||
| * - :code:`OCA3` | ||
| - CODE003 | ||
| - Description for control line 3. | ||
| * - :code:`OCA4` | ||
| - CODE004 | ||
| - Description for control line 4. | ||
| * - :code:`OCA5` | ||
| - CODE005 | ||
| - Description for control line 5. | ||
| * - :code:`OCA6` | ||
| - CODE006 | ||
| - Description for control line 6. | ||
| * - :code:`OCA7` | ||
| - CODE007 | ||
| - Description for control line 7. | ||
| * - :code:`OCA8` | ||
| - CODE008 | ||
| - Description for control line 8. | ||
| * - :code:`OCA9` | ||
| - CODE009 | ||
| - Description for control line 9. | ||
| * - :code:`OCA10` | ||
| - CODE010 | ||
| - Description for control line 10. | ||
| * - :code:`OCA11` | ||
| - CODE011 | ||
| - Description for control line 11. | ||
| * - :code:`OCA12` | ||
| - CODE012 | ||
| - Description for control line 12. | ||
| * - :code:`OCA13` | ||
| - CODE013 | ||
| - Description for control line 13. | ||
| * - :code:`OCA14` | ||
| - CODE014 | ||
| - Description for control line 14. | ||
| * - :code:`OCA15` | ||
| - CODE015 | ||
| - Description for control line 15. | ||
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| .. list-table:: Orthogonal Control Lines B | ||
| :widths: 20, 20, 60 | ||
| :header-rows: 1 | ||
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| * - Control line | ||
| - Code | ||
| - Description | ||
| * - :code:`OCB1` | ||
| - CODE001 | ||
| - Description for control line 1. | ||
| * - :code:`OCB2` | ||
| - CODE002 | ||
| - Description for control line 2. | ||
| * - :code:`OCB3` | ||
| - CODE003 | ||
| - Description for control line 3. | ||
| * - :code:`OCB4` | ||
| - CODE004 | ||
| - Description for control line 4. | ||
| * - :code:`OCB5` | ||
| - CODE005 | ||
| - Description for control line 5. | ||
| * - :code:`OCB6` | ||
| - CODE006 | ||
| - Description for control line 6. | ||
| * - :code:`OCB7` | ||
| - CODE007 | ||
| - Description for control line 7. | ||
| * - :code:`OCB8` | ||
| - CODE008 | ||
| - Description for control line 8. | ||
| * - :code:`OCB9` | ||
| - CODE009 | ||
| - Description for control line 9. | ||
| * - :code:`OCB10` | ||
| - CODE010 | ||
| - Description for control line 10. | ||
| * - :code:`OCB11` | ||
| - CODE011 | ||
| - Description for control line 11. | ||
| * - :code:`OCB12` | ||
| - CODE012 | ||
| - Description for control line 12. | ||
| * - :code:`OCB13` | ||
| - CODE013 | ||
| - Description for control line 13. | ||
| * - :code:`OCB14` | ||
| - CODE014 | ||
| - Description for control line 14. | ||
| * - :code:`OCB15` | ||
| - CODE015 | ||
| - Description for control line 15. |