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#apertus IRC Channel Logs

2021/01/22

Timezone: UTC


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BAndiT1983
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02:58
Bertl_oO
off to bed now ... have a good one everyone!
02:58
Bertl_oO
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Bertl_zZ
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09:56
Bertl
morning folks!
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anuejn
morning :)
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14:07
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14:19
anuejn
Bertl: I have a question concerning the VCCIO in the plugin modules
14:19
anuejn
should it be 3v3 if the low speed gpios are 3v3
14:20
anuejn
or 2v5 when the lvds is lvd is lvds_25 (doesnt make sense, right?)
14:22
Bertl
VCCIO should be 1.8V or 2.5V to have a working LVDS
14:29
anuejn
hm... so the io pins should also be driven with 2.5V?
14:29
Bertl
depens on the usage, if LVDS is chosen, then it will be LVDS voltage levels
14:32
anuejn
Hm... I have to admit that now I do not understand anything anymore
14:40
Bertl
LVDS has a fixed common mode voltage of 1.25V and a swing of 350mV (plus minus tolerances)
14:41
Bertl
the LVDS_18 vs LVDS_25 (or even LVDS_33) is only to setup the IO pins properly for a give IO voltage
14:41
Bertl
so, if your bank is running at 2.5V, you want to use LVDS_25 to achieve the proper LVDS settings
14:43
Bertl
but a 2.5V LVDS connection (configured as LVDS_25) does work the same as an 1.8V LVDS
14:47
Bertl
does that clarify things?
14:55
vup
Bertl: its about the IO0 to IO7 of the plugin modules
14:55
vup
those are usually 3V3, right?
14:56
Bertl
ah, sorry, obviously didn't understand the question correctly
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15:00
Bertl
the VCCIO is the reference voltage for anything non LVDS on the LVDS pairs
15:01
Bertl
the IO0-7 are based on the IO voltage of the RFW
15:13
anuejn
ah ok thanks
15:13
anuejn
that was what I wanted to know
15:13
anuejn
sorry for being unclear
15:13
anuejn
so I will go for 3v3 there
15:18
Bertl
you're welcome!
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20:45
Bertl
off for now ... bbl
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Bertl
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21:25
se6ast1an
off to bed, good night
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