Add UDP packet format docs#205
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| - **Bits 0..=3**: Reserved for header type | ||
| - **Bits 4..=8**: Length of header | ||
| - **Bits 9..=10**: Not used | ||
| - **Bit 11**: Bad frame |
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What exactly constitutes a "bad frame"?
| - **Bits 4..=8**: Length of header | ||
| - **Bits 9..=10**: Not used | ||
| - **Bit 11**: Bad frame | ||
| - **Bit 12**: Run will continue |
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What does this mean?
| - **Bit 0**: FIFO veto | ||
| - **Bit 1**: SMP veto | ||
| - **Bit 2**: TS2 pulse veto | ||
| - **Bit 3**: Wrong pulse veto |
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What exactly is a "wrong pulse"?
Is this e.g. not the first TS1 pulse when someone has selected "First TS1" timing source?
| - **Bit 2**: TS2 pulse veto | ||
| - **Bit 3**: Wrong pulse veto | ||
| - **Bit 4**: Unused | ||
| - **Bit 5**: ISIS slow |
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What exactly does this mean?
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| ### Word 11: next frame address | ||
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| - **Bits 0..=31**: Address of the next frame, in 64-bit words. |
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Check: everywhere else a word is 32 bits, is it really 64 bits here?
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| ### Word 15: checksum | ||
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| - **Bits 0..=31**: Pre-DDR checksum |
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Think we decided to drop this checksum at this level...
| ### Word 8: protons-per-pulse | ||
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| - **Bits 0..=7**: protons-per-pulse in this ISIS frame. | ||
| - **Bits 8..=31**: unused |
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DAE3 seems to send a 10 bit PPP looking at the packet definition, but i guess we don't expect to need that amount?
| ### Word 6: period number | ||
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| - **Bits 0..=15**: Period number | ||
| - **Bits 16..=31**: Not used |
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in event mode period number is just an extra metadata tag - is it worth just letting it be 32 bits?
| - **Bits 6..=9**: External vetoes | ||
| - **Bits 10..=13**: Fast chopper vetoes | ||
| - **Bits 14..=15**: Reserved vetoes | ||
| - **Bits 16..=23**: Unused |
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Is there also a "isis not at 50hz" veto? (or is that "isis slow")
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