Werner Almesberger
908b0631d1
ubb-patgen/ubb-patgen.c: DMA has mystery glitches. Use PIO for now.
2013-01-14 22:18:46 -03:00
Werner Almesberger
3febc9072a
ubb-patgen/ubb-patgen.c (dma_pattern): move pattern parser to parse_pattern
...
... and introduce pattern multipliers <hex>{<repetitions>}
2013-01-14 19:26:15 -03:00
Werner Almesberger
e5cb1c98ea
ubb-patgen/ubb-patgen.c: describe the pattern transfer logic
2013-01-14 17:01:13 -03:00
Werner Almesberger
fa8b5b6324
ubb-patgen/ubb-patgen.c: clean up pattern generation and boundaries
...
The main change is to use only a single transfer and thus avoid tri-stating
DATx during the command phase. To control the timing, we put the first word
"manually" into the FIFO, wait until it has been sent on the bus, and only
then DMA the rest.
2013-01-14 17:01:01 -03:00
Werner Almesberger
09bf9c23ab
ubb-patgen/: add DMA-based pattern transfer (WIP)
...
Works for some patterns but seems to have issues at the edge of
transfers. Clock selection also needs more work.
2013-01-14 03:55:51 -03:00
Werner Almesberger
47140384ee
ubb-patgen/hw/: a simple resistor on CMD is sufficient - no need for a cap
...
Cheaper and easier to control.
2013-01-14 03:11:39 -03:00
Werner Almesberger
52ce1947c5
ubb-patgen/: UBB-based pattern generator (WIP)
...
For now, it only knows to synthesize the clock and to output it.
2013-01-07 17:01:51 -03:00
Werner Almesberger
7c1f06530d
ubb-patgen/hw/labels.fig: cut-out labels for the wires
2013-01-07 17:01:17 -03:00
Werner Almesberger
ed91f621e5
ubb-patgen/hw/: schematics of a pattern generator based on UBB
2013-01-07 17:00:28 -03:00
