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<
TD-Linux >
tnt, thanks for the quick fix!
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<
TD-Linux >
(btw what is the framerate supposed to be? it seems a lot slower here than I've seen in some videos)
06:59
<
TD-Linux >
(also the color pinout for the module shipped with icebreaker is different still to the two examples)
07:06
<
tnt >
TD-Linux: The panel refresh rate in the default config should be ~ 120 Hz.
07:07
<
tnt >
But for the 'video from flash' example the same frame is displayed several times.
07:07
<
TD-Linux >
I mean the framerate of the frames stored in spi flash
07:07
<
tnt >
you can use the buttons on the icebreaker to change the play speed.
07:09
<
TD-Linux >
oh hmm is the clock derived from the ftdi chip?
07:10
<
TD-Linux >
(even at the fastest framerate it is very jittery - it does 2 frames quick then pauses)
07:11
<
tnt >
You should pause it and look at it frame by frame. The example nyan animation is really not smooth in the file ...
07:12
<
tnt >
it's just the first thing I found on line ...
07:12
<
tnt >
some frames are repeated, some are not ...
07:12
<
tnt >
but it's the original file, not the fpga display.
07:12
<
tnt >
And the clock is not derived from the ftdi, it's the same clock, but it's from a MEMS oscillator.
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07:13
<
TD-Linux >
the uniformity of this panel is super good, I'm surprised
07:13
<
TD-Linux >
I've seen a lot of bad displays irl
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07:14
<
TD-Linux >
what's a good source for more?
07:16
<
tnt >
and AFAICT the one from icebreaker come from there too.
07:16
<
TD-Linux >
ok. I saw a lot of vendors but I would like to get similar ones because these look pretty good
07:18
<
tnt >
Unfortunately even from the same shop it can vary ... the first ones esden got were with a different driver chip for instance.
07:20
<
TD-Linux >
yeah. for a big display guess I have to do the whole order in one shot otherwise they might not match
07:21
<
esden >
You have to specify when you are placing your order which chip type you want. If you want to make sure you get the right type.
07:22
<
esden >
If you want to order a bigger amount of panels contact Lysonled, they can give you a decent price, but order about 30% more panels than you need as some of them will have dead pixels that you will need replaced. :/
07:23
<
TD-Linux >
other than the initialization issue, are the other driver chips just as good?
07:23
<
esden >
And definitely order the full amount of displays that you need, otherwise they might even have the correct chip but not the same mechanical mounting pracket.
07:24
<
tnt >
esden: dead leds :/ that sucks to have to test them one by one ...
07:24
<
esden >
yeah ... still waiting for them to get back to me how they want to replace them...
07:25
<
esden >
fortunately the paneltest design by kbob works very nicely to illuminate each color one by one and see if there are any broken leds.
07:25
<
esden >
and we humans can catch a one off pretty well... :)
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<
cpresser_ >
A/win 16
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<
whitequark >
it's MachXO2 based and advertises 1 GHz sample rate.
14:04
<
whitequark >
but MachXO2 doesn't go that high.
14:04
<
whitequark >
what gives?
14:04
<
daveshah >
I've run MachXO2 LVDS inputs fairly close to 1GHz before (at least 800MHz iirc)
14:05
<
daveshah >
It has 4:1 and 8:1 deserialisation
14:05
<
daveshah >
I suspect they're just pushing it a bit
14:05
<
whitequark >
the sysIO buffers top out at 400 MHz
14:05
<
whitequark >
or are those numbers just for output
14:05
<
daveshah >
But I think you can double that with DDR
14:06
<
daveshah >
that's the maximum "full toggle rate"
14:06
<
whitequark >
right, it's more of a 1 Gsps logic analyzer
14:07
<
daveshah >
max DDR input rate is 756Mbps with 1:8 deser
14:07
<
daveshah >
see page see "DDRX4 Serial Input Data Speed"
14:07
<
daveshah >
*see page 61
14:08
<
whitequark >
oh I see, SCLK limited?
14:09
<
daveshah >
ECLK limited I believe
14:09
<
whitequark >
hm, ok
14:10
<
daveshah >
Max SCLK is 388MHz and max ECLK is 400MHz afaics actually
14:10
<
daveshah >
so not sure where the limit is (400MHz ECLK -> 800Mbps in theory)
14:10
<
whitequark >
yeah, that's what i thought is weird
14:11
<
daveshah >
MachXO3 datasheet has 800Mbps max which makes much more sense
14:11
<
daveshah >
normally these things are ECLK limited (ECP5 is at least)
14:12
* whitequark
stares at page
14:12
<
whitequark >
I just realized that L in LM32 is Lattice
14:12
<
whitequark >
I mean I knew it's LatticeMico32, I never realized it's the ... same Lattice
14:12
<
daveshah >
I think it might be a typo, 756Mbps is really just the limit for 1:7 IO and 1:8 can do the full 800Mbps
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