| 23:12 | comradekingu | Bertl: "EvilDragon: comradekingu: Yeah those will be available once everything is fixed."
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| 23:13 | Bertl | great! so once that has happened, contact us again!
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| 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"
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| 23:20 | Bertl | perfect! thanks!
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| 23:21 | comradekingu | Will do. Could be good enough for magic lantern now maybe :)
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| 01:03 | Bertl | off to bed now ... have a good one everyone!
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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.
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| 15:37 | Bertl | off for now ... bbl
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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?
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| 20:22 | anuejn | or how it is set if it is dynamically configurable
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| 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?
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| 20:25 | anuejn | and how does one configure that?
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| 20:40 | Bertl_oO | whoa, slow down ... clock to the temp sensor?
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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
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| 20:44 | Bertl_oO | so you can do custom exposures
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| 20:44 | Bertl_oO | but for the constant frame rate part, the current setup is basically enough
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| 20:45 | Bertl_oO | i.e. new exposures are triggered from the sequencer, which is kind of locked to the HDMI output
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| 20:47 | vup | Bertl_oO: the cmv12k has a extra input for a clock for the temp sensor: CLK_IN
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| 20:50 | Bertl_oO | well, CLK_IN is the master clock of the sensor
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| 20:50 | Bertl_oO | and yes, it is also used for the temp sensor
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| 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."
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| 20:50 | vup | so it seems it is only used for the temp sensor ;)
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| 20:51 | Bertl_oO | interesting
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| 20:52 | Bertl_oO | Input clock, frequency range between 5 and 60
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| 20:52 | Bertl_oO | MHz. Usually set to the LVDS input clock divided by
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| 20:52 | Bertl_oO | the bitmode. Used also for the temperature sensor.
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| 20:52 | Bertl_oO | that's what the data sheet up to 2.10 contained :)
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| 20:53 | vup | interesting,
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| 20:53 | vup | i am looking at the datasheet currently linked on the ams website
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| 20:53 | vup | which confusingly is called v1-00
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| 20:54 | vup | and from 2019-Feb-14
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| 20:55 | vup | so currently it is set to (250 / 12) MHz, right?
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| 20:56 | Bertl_oO | for the firmwares using 250 MHz LVDS clock, yes
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| 20:56 | Bertl_oO | s/firmware/gateware/
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| 20:58 | vup | right ok
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| 20:58 | Bertl_oO | there is an internal PLL which IMHO is based on the CLK_IN
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| 20:58 | Bertl_oO | but the use was discouraged because of ES01
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| 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
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| 20:59 | Bertl_oO | CLK_IN.
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| 21:00 | Bertl_oO | problems/errors with the PLL led to:
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| 21:00 | Bertl_oO | Therefore we recommend to only use the LVDS input clock and disable the internal PLL.
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| 21:00 | Bertl_oO | which might explain why the newer datasheets only use CLK_IN for the temp sensor
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| 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
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| 21:10 | vup | only the PLL supply is still left
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| 21:12 | Bertl_oO | wonder if that is required when the PLL is disabled :)
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| 21:14 | vup | yeah me too
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| 21:14 | vup | well it says "PLL 1.98 V supply (unused)" in the new datasheet
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| 21:14 | vup | so probably not
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| 21:16 | anuejn | lol
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| 21:17 | anuejn | what is sfe and what is ifb?
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| 21:17 | anuejn | thanks for the answers btw :)
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| 21:17 | Bertl_oO | Sensor Frontend and Interface Board
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| 21:20 | anuejn | ah
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| 21:20 | anuejn | ok
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| 21:21 | anuejn | that makes sense
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| 21:21 | anuejn | and the current gateware triggers the exposures syncronized with the hdmi
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| 21:21 | Bertl_oO | indirectly via the sequencer
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| 21:21 | anuejn | ...where the refresh rate is baked into the bitstream?
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| 21:22 | Bertl_oO | nope, depends on your settings
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| 21:22 | anuejn | ah nice
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| 21:22 | Bertl_oO | e.g. if exposure and transfer takes 5ms
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| 21:22 | Bertl_oO | and the HDMI frame rate is configured to one frame every 6ms
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| 21:23 | Bertl_oO | (just making up numbers here :)
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| 21:23 | Bertl_oO | then the resulting sensor frame rate will be 6ms
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| 21:23 | anuejn | yup i see
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| 21:23 | anuejn | but how can the hdmi frame rate be configured?
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| 21:28 | Bertl_oO | to some extend via the FPGA registers
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| 21:30 | Bertl_oO | for example, 50FPS vs 60FPS does not depend on the actual HDMI clock rate
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| 21:33 | anuejn | but the hdmi clock rate is baked into the bitstream?
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| 21:33 | Bertl_oO | yes and no
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| 21:33 | Bertl_oO | the PLL/MMCM is pre-configured
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| 21:34 | Bertl_oO | but it is also mapped via registers, so you can adjust it
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| 21:34 | anuejn | ah nice
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| 21:34 | anuejn | i guess i will figure that out some other day (TM)
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| 21:34 | Bertl_oO | hehe
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