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<blockquote data-quote="FruithatMods" data-source="post: 10070805" data-attributes="member: 473927"><p>There is actually a calculator somewhere on the Internet about the maximum length of wires for signal traces.</p><p></p><p>The emmc protocol is actually really sensitive to wire length and pcb trace routing. If the emmc traces are badly routed on the Pico pcb this can also reduce the wire length which you can use.</p><p></p><p>I have personally experienced this problem on a different pcb, specifically when breaking out the emmc connections! So the exact same thing as these chip installations! The emmc routing was perfect on this pcb too and length was still an issue. </p><p></p><p>When I cut the wires in half and tried again the connection was established and I could suddenly access the emmc. Like magic! </p><p></p><p>If your wires are already short something else could be the issue.</p><p>[automerge]1676051919[/automerge]</p><p></p><p>The spec sheets disprove your argument. Also this is not how adc or pwm works. You don't need to send a 3.3v signal. You can just send a 1.8v or 0.5v signal or anything you choose. </p><p></p><p>You are probably thinking of the 3.3v power out pad which can only provide 3.3 volts. But this is different.</p></blockquote><p></p>
[QUOTE="FruithatMods, post: 10070805, member: 473927"] There is actually a calculator somewhere on the Internet about the maximum length of wires for signal traces. The emmc protocol is actually really sensitive to wire length and pcb trace routing. If the emmc traces are badly routed on the Pico pcb this can also reduce the wire length which you can use. I have personally experienced this problem on a different pcb, specifically when breaking out the emmc connections! So the exact same thing as these chip installations! The emmc routing was perfect on this pcb too and length was still an issue. When I cut the wires in half and tried again the connection was established and I could suddenly access the emmc. Like magic! If your wires are already short something else could be the issue. [automerge]1676051919[/automerge] The spec sheets disprove your argument. Also this is not how adc or pwm works. You don't need to send a 3.3v signal. You can just send a 1.8v or 0.5v signal or anything you choose. You are probably thinking of the 3.3v power out pad which can only provide 3.3 volts. But this is different. [/QUOTE]
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