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#apertus IRC Channel Logs

2021/01/22

Timezone: UTC

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Bertl_oO
off to bed now ... have a good one everyone!
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Bertl_zZ
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Bertl
morning folks!
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anuejn
morning :)
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15:19
anuejn
Bertl: I have a question concerning the VCCIO in the plugin modules
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anuejn
should it be 3v3 if the low speed gpios are 3v3
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anuejn
or 2v5 when the lvds is lvd is lvds_25 (doesnt make sense, right?)
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Bertl
VCCIO should be 1.8V or 2.5V to have a working LVDS
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15:29
anuejn
hm... so the io pins should also be driven with 2.5V?
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Bertl
depens on the usage, if LVDS is chosen, then it will be LVDS voltage levels
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anuejn
Hm... I have to admit that now I do not understand anything anymore
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15:40
Bertl
LVDS has a fixed common mode voltage of 1.25V and a swing of 350mV (plus minus tolerances)
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15:41
Bertl
the LVDS_18 vs LVDS_25 (or even LVDS_33) is only to setup the IO pins properly for a give IO voltage
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Bertl
so, if your bank is running at 2.5V, you want to use LVDS_25 to achieve the proper LVDS settings
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15:43
Bertl
but a 2.5V LVDS connection (configured as LVDS_25) does work the same as an 1.8V LVDS
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15:47
Bertl
does that clarify things?
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vup
Bertl: its about the IO0 to IO7 of the plugin modules
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vup
those are usually 3V3, right?
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Bertl
ah, sorry, obviously didn't understand the question correctly
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16:00
Bertl
the VCCIO is the reference voltage for anything non LVDS on the LVDS pairs
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Bertl
the IO0-7 are based on the IO voltage of the RFW
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anuejn
ah ok thanks
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anuejn
that was what I wanted to know
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anuejn
sorry for being unclear
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anuejn
so I will go for 3v3 there
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Bertl
you're welcome!
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21:45
Bertl
off for now ... bbl
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Bertl
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se6ast1an
off to bed, good night
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