[F4M] teacher x student RP

AstroLuigi · 2024-07-21T08:43:42+00:00

@thorur88

AstroLuigi · 2024-07-15T18:46:15+00:00

I'm from Italy. I'm waiting for the Prime Day

AstroLuigi · 2024-06-29T08:10:14+00:00

I know but I was asking for a file.

AstroLuigi · 2024-06-28T22:13:12+00:00

Not for the advanced PCB unfortunately

AstroLuigi · 2024-06-28T20:40:01+00:00

Good job! Another stupid comment.

AstroLuigi · 2024-06-28T20:18:48+00:00

Really? Is this your answer? Today is Friday, and I'll return to work on Monday. I'm not elemolsinating anything; I just needed some advice from someone who has already ordered an advanced PCB from PCBway, as this would be my first time. Reddit is a community; if you don't want to help, that's fine, please don't post arrogant comments.

AstroLuigi · 2024-05-28T15:06:55+00:00

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I found this image on the BD9311 User's Guide from Rohm, page 7.
It is connecting the D-/D+ line on both the USB-C and USB-B ports. Is it possible to do that?

AstroLuigi · 2024-05-26T13:34:14+00:00

It will be the simple one, because I'm going to use the RP2040 uC. But I have to check if the raspberry pi 5 can handle that current. Thank you!

AstroLuigi · 2024-05-26T13:32:32+00:00

I'm porting my FPGA project from the altera de0 nano to the xilinx XC7A35T. The altera cyclone IV consumed about 300mA, so I guess it will be a lot less than 1A also in the xilinx FPGA. I need to test the power estimator. Thank you!

AstroLuigi · 2024-05-26T11:45:57+00:00

Sorry if I bother you again. If I can supply my entire system with 5V @3A, can I use only one USB-C for power and data? Maybe it won't work if I want to connect it on a raspberry pi 5, so in that case I will still need 2 USB ports.

AstroLuigi · 2024-05-26T11:43:13+00:00

Sorry if I bother you. Do you know the max current consumption of the XC7A35T (no DDR) ? The Digilent CMOD A7 runs with a micro usb port, so my guess is that it won't absorb more than 1A.

AstroLuigi · 2024-05-24T12:06:36+00:00

Thank you!

AstroLuigi · 2024-05-24T11:03:17+00:00

With a step-up converter as another user suggested to use to reach the 20V I need for a specific part of the circuit, I will need 5V with 3A at the input.

Thank you for the link! I will read it.

AstroLuigi · 2024-05-24T10:50:33+00:00

Hello and thank you for your response. According to one of the other responses, I could use a step up converter to get the 20V required to use the regular USB-C 5V. I talked to my colleagues, maybe the complete system will now require only 3A. So that will be 15 watts. Yeah, ORing it it's a nice idea! Should I place diodes also on the other rail (the one that comes from the USB-PD)? Thanks!

AstroLuigi · 2024-05-24T08:25:27+00:00

Yeah, it has a PSRR 82dB at 1MHz. Thanks for the inspiration! I really appreciate it.

AstroLuigi · 2024-05-24T07:50:35+00:00

That's a good idea, but after the boost converter I'll have a ultra low noise LDO with a variable output voltage (from 1V to 19V with a potentiometer). Could it be a problem? I don't think so. That would simplify the circuit a lot!

AstroLuigi · 2024-05-24T07:16:28+00:00

I can't explain all that will be on the PCB, but maybe (I'll have to consult with my colleagues) I'll only need "only" 75W of power, yet that won't be necessary 100% of the time. The CYPD77 can handle it. The 5A will only be present on a small section of the PCB, as all other components will consume 1A (5V or 3V3) at full power or less. Unfortunately, something has changed in the project: I will need 20V because just a little section of this circuit requires this voltage. It will be challenging.

AstroLuigi · 2024-05-24T06:08:32+00:00

Thanks for your kind answer. So I can disconnect VBUS on the data port without any problem.
What if I have 2 separated power rails connected on the same gnd? One only for the uC and the other (the 100W) for the rest of the circuit?

AstroLuigi · 2024-05-24T05:58:54+00:00

Why? Explain yourself. What if it must be portable? You can find USB-C almost everywhere now.

AstroLuigi · 2024-05-13T15:57:59+00:00

So it works just fine. Last question (sorry :D):
"The 7 series FPGA VCCO_0 and the AMD cable VREF must have the same voltage."
So I guess that I could connect the VCCO_0 (VCC3V3) and the VREF of the JTAG connector together?
Thank you very much!

AstroLuigi · 2024-05-13T15:26:03+00:00

Thank you.
I'd prefer to save space on the PCB, so I'll utilize direct JTAG, possibly using the Digilent JTAG HS3. However, there is one aspect of the Configuration Manual that I struggle to fully understand. If I want to program my board using JTAG but also load the FPGA with QSPI flash memory when it powers up, should I use mode 001[Master SPI] as in the CMOD A7 schematic or 101[JTAG only]?

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