Questions tagged [port]

A port is a physical interface for a computing device to other devices. They are often realized as a single pin or a set of pins and can be operated in different modes.

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Arduino PORT manipulation analogRead()

I am trying to figure out on my Arduino UNO how to read analog input using port manipulation. I have found a lot of tutorials on how to do that for digitalRead / digitalWrite, but nothing with ...
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Short circuit USB port with multimeter

I've installed new car audio into my car. It works fine for a few months now. There is a USB port on the car audio for charging. Before actually using it, I wanted to test if it is safe enough and ...
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How do I calculate the terminal-to-terminal resistance and capacitance from an impedance matrix?

If I have a circuit with \$N\$ ports (and therefore \$2N\$ terminals), how can I calculate the terminal-to-terminal resistance and capacitance from a given impedance matrix \$Z\$? We can assume a ...
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59 views

8-bit quasi-bidirectional I/O port

The schematic attached is from a very old device. It's using the microcontroller SAB 80535. According to the datasheet P5.7-P5.0 is an 8-bit quasi-bidirectional I/O port. There's a keyboard, a LCD and ...
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1answer
54 views

Reflection coefficient in a microwave amplifier

I have a question about the reflection coefficient in a microwave amplifier (two-port network), what is it and what is it based on?
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1answer
54 views

What is the difference between PTC and PORTC?

I am working on s32k144 controller in which I learnt how to configure pins as INPUT, while referring data sheet I got to know the base address GPIOC base address: 400F_F080h which is matching with ...
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1answer
66 views

What is difference in link rate and pixel rate in Display Port

I was going through the Display port Specification. I came across below para "1.7.1 Make-up of the Main Link The Main Link consists of one, two or four AC-coupled, doubly terminated differential ...
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50 views

How to connect a Microchip ENC28J60 to 3 port stand alone unmanaged switch chip with out using MCU

I have a working design running a Microchip PIC24 with TCP IP stack using the ENC28J60 chip. I am new to switching, and would like to add a second port for daisy chaining multiple devices without ...
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1answer
77 views

2 Ethernet jacks on a Device with ENC28J60 chip in with switch

Have a ethernet device that works with Microchips ENC28J60 chip perfectly. So if I want to connect a cable from a switch/controller, to device 1 (that has 2 RJ45 jacks), then have device 1 second port ...
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1answer
333 views

What is the difference between a USB port and a USB receptacle?

The Wikipedia article USB hardware states: Standard connectors The type-A plug. This plug has an elongated rectangular cross-section, inserts into a type-A receptacle on a downstream port on a USB ...
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3answers
101 views

Why 8051 microcontroller uses four different ports for I/O instead of using address bus and control signals

8051 has four ports for I/O .Therefore four peripherals can be connected to it at a time . My question is why doesn't it use the address bus to activate a specific peripheral ...and then use the data ...
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1answer
192 views

Is it possible to use SIM7600 modem for both data and SMS simultaneously?

I am interested in using the SIM7600 module for designing a system with LTE communication. The module will be connected to the host system via USB. I would like the host system's Linux to use PPP to ...
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2answers
43 views

Test to identify active source in electrical network

I have a black box of a N-port electrical network and I wanted to know whether inside this box is there any active source of energy (i.e battery) present or not, so is it possible to determine active ...
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1answer
297 views

Determine the z parameters of two port network

New to EE, and I was wondering if anyone could help me check what is wrong with my answer on this question. $$\frac{V1-Vn}{4}+\frac{V2-Vn}{3}=\frac{Vn-4V1}{2}$$ $$Vn=\frac{-27}{13}V1-\frac{4}{13}V2 -...
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1answer
64 views

What is this port called? I want to guess it is for video

What is this port called? If this is off topic, please direct me to the appropriate place for my question Looks equal in thickness to micro, slightly more narrow resulting in a more squared shape.
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1answer
34 views

Do we need to send HSync, Vsync, HFP, VFP, HACTIVE in the Display port

On going through the display port specification, in the main stream packet structure I see only the pixels getting packed between blanking start and blanking end. Don't we need to send HFP, HBP, Hsync,...
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179 views

What is inter-lane skew insertion in display port

I am reading the display port specification facing some issue in understanding some terminology 1. What is inter lane clock skew 2. In the fig 2.8 what is bus steering ?
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1answer
34 views

Question regarding a charger modification for a Dell 3100 docking station

I'm quite new and inexperienced to this so I would appreciate any guidance I can get. Given the quarantine situation I need to work from home more so I purchased a used D3100 docking station but with ...
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1answer
613 views

What exactly do D+ and D- on a USB connection do? [closed]

Of the four pins on the usb I know the power and the ground pins are used to supply power to a USB device. But the other two ...
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2answers
1k views

What does _SFR_IO8(0x04) do? AVR

I'm trying to write a program in assembly to toggle the on-board LED of the Arduino MEGA2560. To do so I just have to indicate the direction of the pin (13 in this case which is PB7) as output and ...
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1answer
35 views

Is there a way to direct the data to a particular port for this scenario?

There is a PC program which reads ASCII data from serial port in real time and processes it. The thing is I'm not able to change the code. The program reads the incoming data where one can only set ...
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1answer
102 views

Options for replacing a broken charger when dealer no longer sells these [closed]

First post on this exchange, please do not delete it as a "request for shopping recommendation", this is close to, but not intended as one of those. We have a Trimble DiNi 22 which runs fine, but we ...
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1answer
61 views

USB3/2 hub cascading (reverse hierarchy)

I want to implement multiple USB ports using one USB3.0 and one USB2.0 hub with four ports each. The microprocessor I want to implement these ports for has just a single USB3.0 port left (of which the ...
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2answers
2k views

How to trigger a relay through a USB port?

I'm more a computer programmer than an electronic specialist so my question might seem simple to you. I have a speaker and some other devices, I wanted to turn them off when TV is turned off, so I ...
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1answer
84 views

What type of printer port is this?

I just got a currency discriminator (Carnation CR1500) that can be connected to a receipt printer. There is a modular jack on the back of the machine, but I don't know what kind of cable it needs. It ...
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3answers
424 views

Characteristic Impedance of a port

I thought that the characteristic impedance was a parameter defined only for transmission lines. But now I have this question: is it defined also for a port? And, eventually, what does it represent ...
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1answer
95 views

Decoding Signals from an Unknown Port on Spectrometer

We have a Thermo-Nicolet Nexus 670 FT-IR Spectrophotometer, made in the USA around 2000. It was the work horse of the infrared spectroscopy community. The instrument sends out signals to a proprietary ...
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2answers
206 views

Impedance of the circuit between given points

I am trying to learn one and two port networks and the book introduced Determinants and minors to calculate the impedance of the circuit. Kindly see the following question: I have managed to do the ...
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1answer
33 views

Directional Coupler Terminals

I have a basic question about directional couplers. In this scheme each port is represented by one wire. What does it mean? The other terminal of each port is GND for all?
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1answer
221 views

Pic Programming - Nested Loops

I'm having some problem with my code and I can't get my two loops working properly. I'm new to C programming so I might have got the basic loop concepts wrong. I've got 10 LED lights connected to my ...
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1answer
73 views

Understanding Ports on DAC

So I am working with this DAC and I am trying to attach reference voltages and outputs, but I am confused. Looking at this image of the board, what is the connection to VOUT ? How do I connect to ...
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1answer
77 views

low voltage pin in Keil (ARM) debuging?

I am going to work with one TFT LCD 2'8 (ILI9325 Driver) with STM32F103RE ARM MCU. So I have one example program in Mikroc for ARM ( Microelectronica Co), which is working good, you could download ...
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72 views

For given circuit, does the current “io” through the branch equal zero after short circuit ? [2-port network]

The circuit is; simulate this circuit – Schematic created using CircuitLab For given 2 port network, Im shorting V1 to solve for y22 and y12 and apply a current source at V2.[Y-Parameters] ...
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137 views

Determine Y-parameters for given circuit. [Used Nodal Analysis]

I am trying to solve this circuit for past 3 hours, no success, so I am posting here. simulate this circuit – Schematic created using CircuitLab I used nodal analysis, I will go over the ...
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2answers
47 views

Exercise about voltage thresholds of logical port

I don't understand how professor resolves this exercise! I have two connected logical port and I want to calculate the time of transition from low to high for example. In the solution, the minimum ...
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1answer
1k views

Two-port model of a BJT

In electronic books, the small signal model of a BJT is given as: I've just studied two-port networks theory and, as an application, another book I'm reading shows this picture: 1st question: why do ...
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5answers
119 views

Should I use all the pins from 1 Port or few from each available (STM32)?

I am using a MCU from the ST, specifically from the STM32L1xx series. I want to connect 2 sensors, both of which will use the I2C protocol, 1 MicroSD card with SPI and 4 Interrupts. Is it a good ...
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1answer
1k views

Unconnected port warning in VHDL

I get this warning after synthesis is completed in Vivado. I have a single port ram which is constructed using block memory generator. Its output is connected to Brightness_Contrast module's data_in ...
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2answers
909 views

VHDL 4-bit Shift-and-Add Multiplier Buffer and Out port error

I am working on a creating a 4-bit Shift-and-Add Multiplier. I am getting this warning message - "WARNING:HDLParsers:3555 - "//filer1.egr.msu.edu/samarar1/ece230/Project05/Project05.vhd" Line 220. ...
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2answers
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Does a “Contact-Only” Port Exist?

I think my demand is quite unusual, or maybe i just don't search with the good keywords... Any help will be greatly appreciated ! Context: I actually work on a robotic project and have specific ...
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1answer
120 views

Can we connect both ASIC and an FPGA both to the same physical output Ethernet ports at the same time? [closed]

I am doing simulation of my research design on single FPGA, in which I simulated two switching chips ASIC and an FPGA. I mean, I simulated single FPGA working as two chips, and connected them so that ...
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1answer
145 views

LVDS inputs and TTL outputs in design

I have a design and most of the entry ports are the outputs of an ADC these outputs are LVDS. My question is how do i declare the inputs of my FPGA as LVDS signals? And how to declare the outputs has ...
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182 views

Open Drain while transmitting data with port direction output

I am new to this information portal! However, I have question regarding open drain. I read that, in open drain mode, neither of the devices (slave/master) are allowed to drive the data line HIGH, ...
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1answer
261 views

How to enable abbreviated port names in Atmel Studio?

Good day! I have been working with Atmel Studio lately and am a bit confused about notation. Thus far, when I reference a pin, I usually just use the PORTxn notation (example: PORD0). However, I ...
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1answer
345 views

Port Direction - I/O [closed]

I have one question regarding the direction of Port Pin (GPIO). Is it mandatory to change the direction of port pin to input in order to read the value from that port. Keeping the port direction as ...
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1answer
478 views

How can I test TCP/IP AT-Commands with server?

I'm currently using SIM868 to make a GPS tracker, I wanted to know how to test tcp/ip protocol with a server. I do not have a server but got a website and a wifi connection(DIR-600M Router) , Is ...
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1answer
73 views

Unknown port in videocassette recorder JVC HS-D320S [closed]

I have an old videocassette recorder JVC HS-D320S, I want to ultimately try to digitalise some videocassettes, but I'm having troubling identifying the ports on the back. PS: I'll clarify the ...
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1answer
776 views

Altium hierarchical design assigning net to power port/port

I have a hierachical multichannel design and I´m having problems to set properly the project properties so that the following issue is removed. As you can see one of the ports of the child sheet is ...
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2answers
515 views

Thevenin Equivalent Circuit of Two-Port (Transmission Matrix)

The question is to calculate the thevevin equivalent of the following two port network described by the transmission matrix [A B] [C D] The way I approached this was from the transmission matrix we ...
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3answers
2k views

My first AVR C program- LED not blinking

I created a simple program to be put onto a ATMega328P chip (Datasheet). I wrote my first program in ATMEL studio that I wanted to use to Blink an LED at a rate of 0.5Hz with extremely low power usage....