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#apertus IRC Channel Logs

2019/12/11

Timezone: UTC


23:12
comradekingu
Bertl: "EvilDragon: comradekingu: Yeah those will be available once everything is fixed."
23:13
Bertl
great! so once that has happened, contact us again!
23:19
comradekingu
Will do, the current discussion of picking through the hardware/software bugs and making everything work is the "everything is fixed part"
23:20
Bertl
perfect! thanks!
23:21
comradekingu
Will do. Could be good enough for magic lantern now maybe :)
00:22
aombk
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aombk
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aombk
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01:03
Bertl
off to bed now ... have a good one everyone!
01:03
Bertl
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04:50
Guest99
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Guest99
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05:46
BAndiT1983|away
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BAndiT1983
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BAndiT1983|away
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05:59
BAndiT1983
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07:06
Bertl_zZ
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10:52
RexOrCine|away
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11:00
RexOrCine
(12:52:03) anuejn: 17:03:44> screenshot is https://files.niemo.de/Screenshot_2019-12-09%20AXIOM-web.png < Nice.
11:14
Bertl_oO
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BAndiT1983|away
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BAndiT1983
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sebix
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BAndiT1983|away
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15:37
Bertl
off for now ... bbl
15:38
Bertl
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17:07
BAndiT1983
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18:44
illwieckz
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illwieckz
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19:17
BAndiT1983|away
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20:08
RexOrCine
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20:21
anuejn
Bertl_oO: do you know of the top of your head what the clock applied to the temperature sensor of the cmv is in the current gateware?
20:22
anuejn
or how it is set if it is dynamically configurable
20:24
anuejn
and is there any mechanism to use an external frame trigger from the fpga to achive a constant frame rate that is independent of the exposure time?
20:25
anuejn
and how does one configure that?
20:40
Bertl_oO
whoa, slow down ... clock to the temp sensor?
20:40
illwieckz
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20:43
Bertl_oO
for the external frame trigger part, we have T_EXP1 and T_EXP2 connected on the SFE and routed via the IFB
20:44
Bertl_oO
so you can do custom exposures
20:44
Bertl_oO
but for the constant frame rate part, the current setup is basically enough
20:45
Bertl_oO
i.e. new exposures are triggered from the sequencer, which is kind of locked to the HDMI output
20:47
vup
Bertl_oO: the cmv12k has a extra input for a clock for the temp sensor: CLK_IN
20:50
Bertl_oO
well, CLK_IN is the master clock of the sensor
20:50
Bertl_oO
and yes, it is also used for the temp sensor
20:50
vup
well the datasheet says: "Optional input clock, frequency range between 10 MHz and 60 MHz. Only needed for the internal temperature sensor."
20:50
vup
so it seems it is only used for the temp sensor ;)
20:51
Bertl_oO
interesting
20:52
Bertl_oO
Input clock, frequency range between 5 and 60
20:52
Bertl_oO
MHz. Usually set to the LVDS input clock divided by
20:52
Bertl_oO
the bitmode. Used also for the temperature sensor.
20:52
Bertl_oO
that's what the data sheet up to 2.10 contained :)
20:53
vup
interesting,
20:53
vup
i am looking at the datasheet currently linked on the ams website
20:53
vup
which confusingly is called v1-00
20:54
vup
and from 2019-Feb-14
20:55
vup
so currently it is set to (250 / 12) MHz, right?
20:56
Bertl_oO
for the firmwares using 250 MHz LVDS clock, yes
20:56
Bertl_oO
s/firmware/gateware/
20:58
vup
right ok
20:58
Bertl_oO
there is an internal PLL which IMHO is based on the CLK_IN
20:58
Bertl_oO
but the use was discouraged because of ES01
20:59
Bertl_oO
The CMV12000 v2 has an internal PLL which could provide a fast internal clock by inputting a slower CMOS clock at
20:59
Bertl_oO
CLK_IN.
21:00
Bertl_oO
problems/errors with the PLL led to:
21:00
Bertl_oO
Therefore we recommend to only use the LVDS input clock and disable the internal PLL.
21:00
Bertl_oO
which might explain why the newer datasheets only use CLK_IN for the temp sensor
21:10
vup
yeah, seems like they removed the section on the PLL in version 2.10 and then changed the description of CLK_IN after that
21:10
vup
only the PLL supply is still left
21:12
Bertl_oO
wonder if that is required when the PLL is disabled :)
21:14
vup
yeah me too
21:14
vup
well it says "PLL 1.98 V supply (unused)" in the new datasheet
21:14
vup
so probably not
21:16
anuejn
lol
21:17
anuejn
what is sfe and what is ifb?
21:17
anuejn
thanks for the answers btw :)
21:17
Bertl_oO
Sensor Frontend and Interface Board
21:20
anuejn
ah
21:20
anuejn
ok
21:21
anuejn
that makes sense
21:21
anuejn
and the current gateware triggers the exposures syncronized with the hdmi
21:21
Bertl_oO
indirectly via the sequencer
21:21
anuejn
...where the refresh rate is baked into the bitstream?
21:22
Bertl_oO
nope, depends on your settings
21:22
anuejn
ah nice
21:22
Bertl_oO
e.g. if exposure and transfer takes 5ms
21:22
Bertl_oO
and the HDMI frame rate is configured to one frame every 6ms
21:23
Bertl_oO
(just making up numbers here :)
21:23
Bertl_oO
then the resulting sensor frame rate will be 6ms
21:23
anuejn
yup i see
21:23
anuejn
but how can the hdmi frame rate be configured?
21:28
Bertl_oO
to some extend via the FPGA registers
21:30
Bertl_oO
for example, 50FPS vs 60FPS does not depend on the actual HDMI clock rate
21:33
anuejn
but the hdmi clock rate is baked into the bitstream?
21:33
Bertl_oO
yes and no
21:33
BAndiT1983
changed nick to: BAndiT1983|away
21:33
Bertl_oO
the PLL/MMCM is pre-configured
21:34
Bertl_oO
but it is also mapped via registers, so you can adjust it
21:34
anuejn
ah nice
21:34
anuejn
i guess i will figure that out some other day (TM)
21:34
Bertl_oO
hehe
21:45
illwieckz
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