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| 02:20 | Bertl_oO | vup: yes, what's the plan there?
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| 04:09 | Bertl_oO | off to bed now ... have a good one everyone!
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| 10:06 | Bertl | morning folks!
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| 11:22 | vup | Bertl: well we want to test up to which frequencies we can reliably use a connector
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| 11:31 | Bertl | thought so, but what's the plan here?
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| 11:32 | Bertl | some kind of loopback module?
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| 11:32 | Bertl | or a test board which uses the connector in question or something completely different?
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| 12:46 | vup | Bertl: well we are starting with the 100mil headers that are already present on the current micro, using a wire bridge to loopback one pin to another
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| 12:54 | Bertl | wire bridge?
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| 12:54 | Bertl | you mean a cable?
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| 12:59 | vup | yeah
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| 12:59 | Bertl | it will be tricky to match the 50/100Ohm there
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| 13:00 | vup | well the connector itself also doesn't match 50/100Ohm, so keeping the cable short shouldn't make it much worse i would think
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| 13:00 | Bertl | really depends on the impedance changes
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| 13:01 | vup | yeah, this isn't really meant as a decisive test for it not working
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| 13:02 | vup | but if it works with that setup, it should definitely work with a more proper setup
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| 13:02 | Bertl | hard to tell, could work by accident as well
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| 13:02 | vup | how so?
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| 13:02 | Bertl | what exactly is the goal of the test?
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| 13:03 | vup | well mainly figuring out if we can just use 100mil headers for the sensor connection
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| 13:04 | Bertl | okay, so the connection goes 'main PCB' - 100mil header - 'sensor PCB'
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| 13:04 | vup | yes
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| 13:04 | Bertl | and the data transfer is typically in the other direction, yes?
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| 13:04 | vup | for most sensor I would imagine so
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| 13:05 | vup | the cmv12k has a high speed clock input, right?
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| 13:05 | Bertl | okay, so the best setup would be to create a dummy senor PCB which consists of a properly routed 'loop' from I/Os of one side of the connector to the other
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| 13:05 | Bertl | e.g. if you have 8 LVDS pairs for sensor connection
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| 13:06 | Bertl | create loops between the outer most down to the innermost
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| 13:06 | Bertl | all properly routed on the dummy sensor board
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| 13:07 | Bertl | this way you know when the loopback test works at a given frequency, the sensor will be fine and in safe range
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| 13:07 | Bertl | (because you traverse the connector twice for every loop)
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| 13:07 | vup | yes that sounds like a good setup
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| 13:08 | vup | the hope was we can forgo the need of the dummy sensor board if it works with the current setup
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| 13:08 | Bertl | well, you can test that as well, but I wouldn't draw too many conclusions from that
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| 13:10 | Bertl | capacitance and inductance might just cancel each outher out at the freqeuncy you test with
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| 13:10 | vup | hmm yeah maybe
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| 13:11 | vup | I was planning on doing a frequency sweep anyways (roughly 250MHz DDR -> 500MHz DDR)
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| 13:11 | Bertl | okay, that will definitely get better results
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| 13:13 | vup | using that I think we should be able to rule out most accidents
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| 13:13 | Bertl | could work
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| 13:13 | vup | but i guess we will just have to see how the results look like and then decide if we want to test it with a dummy sensor board or not
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| 13:13 | Bertl | definitely let me know how it goes :)
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| 13:13 | vup | yes, will do
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| 15:00 | Bertl | off for now ... bbl
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