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Which should I go for ? SDS1202X-E vs DHO812
kenkit:
Thank you for your advice, I will go for the DH0804 For the four channels then maybe hack it to 100mhz.
The Siglents are also heavier in terms of volumetric weight shipping so they would cost me more to get them here.
Helix70:
--- Quote from: Fungus on December 06, 2024, 07:26:59 am ---
--- Quote from: tautech on December 06, 2024, 12:43:40 am ---Not technically correct when a DSO provides a Clock Timeout setting for protocol decoding which SDS1202X-E does.
--- End quote ---
SPI is usually "more than two" wires.
(and even Siglent doesn't make a 3-channel model, so four channels it is)
PS: Rigol has triggers, too, believe it or not.
--- End quote ---
I think Rob is telling you that you don't need to probe CLK, the DSO can be told the timeout in order to decode using just the data channel. If that's the case, you only need 2 channels, one for MISO and one for MOSI, and set an appropriate clock timeout.
I might be wrong.
Regards,
Josh
mwb1100:
Here is a demonstration of decoding SPI with two probes using the clock timeout trigger. Only one of the I/O channels (MISO or MOSI) can be probed as the clock is needed for the trigger and decode.
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As Fungus said, this isn't ideal if you need to decode I/O in both directions, but often you only care about one direction. For example, an LCD controller might only have commands and data sent to it for initialization and display. A sensor might only send data for whatever is being sensed and accepts no commands.
Fungus:
--- Quote from: Helix70 on December 06, 2024, 11:07:46 pm ---I think Rob is telling you that you don't need to probe CLK, the DSO can be told the timeout in order to decode using just the data channel. If that's the case, you only need 2 channels, one for MISO and one for MOSI, and set an appropriate clock timeout.
--- End quote ---
How can you decode the data if you don't know where the bits are?
eg. I could send 0xff 0xff 0xff 0xff, how would you decode that without a clock signal?
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