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Questions tagged [bus]

is a subsystem that transfers a plurality of digital bits grouped together to achieve or represent a common function or variable.

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Injecting bits to a parallel communication bus possible?

Antennas can recieve data (bits) because RF signals induce an analog signal into it in a serial format, essentially a voltage that varies over time. My question is can we have an antenna that can ...
19216811's user avatar
1 vote
1 answer
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Hot pluggable CAN collections of devices

I'm trying to create a network of hot pluggable collections of iot devices into a bus (Containing Device 'A') that will always be present. There could be up to 50 collections with each collection ...
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Bus contention - possible momentary short circuit with 74HC

I have a tristate bus where both input and output are controlled via 74HC573 latches, with only one latch OE (output enabled) active at any time. My concern is that the signal update from the control ...
padawan's user avatar
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Powering LED from a CAN bus signal

I am looking for a can it be done and, if someone is willing, a how to. I am building an OBD2 breakout box for easily scoping automotive computer data lines and want to add LEDs as a quick visual of ...
ToreanPW's user avatar
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2 answers
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Memory clock and Bus clock

The bus clock rate is how many times per second data is transferred from one component to another. If we consider DRAM DDR4-3200, the clock frequency of the RAM bus today can be 1600 MHz at the same ...
Slaycapь's user avatar
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Network bus with tree topology with network exploration

I am planing to experiment with Arduino framework to create a network of microcontrollers, where they communicate with each other. There will be one master and this should be able to explore the ...
VPNer's user avatar
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1 answer
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Two CAN transceivers on the same PCB

I have two CAN transceivers on the same PCB; they are connected to a Raspberry and a PIC32 MCU. The PIC32 can receive and send any message, but the RPI can rarely receive messages from the ...
helloiamzoltanfarkas's user avatar
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1 answer
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Is a CAN bus device necessary at the end of the terminated network line?

I am designing a CAN bus network with three devices near one end and one device at the other end about 8' away. As long as I retain the terminator at the far end, is a device at the far end required ...
PhixItPhil's user avatar
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STM32 Can bus random data

I am using an STM32 to transmit data over CAN using CAN2. Currently, my code is only setting up the can peripheral and sending periodic messages. My messages usually look like this on the receiving ...
Daniel D.'s user avatar
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2 answers
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Why do we use a MUX rather than tristate buffers to implement a bus?

Consider a small digital system consisting of registers connected to a bus interconnection network. It is well-known that the output to the bus can (functionally) be implemented either with tristate ...
EE18's user avatar
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Ferrite bead value for a LIN bus protection circuit

What is the proper value for FB1 in relation to the surrounding capacitors in this diagram? The FB1 resistance is measured to 0.76ohm and package size is 0603. All components are AEC-Q200 rated. The ...
ajdalshov's user avatar
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Capture audio from TCS Intercom BUS

I try to monitor and capture audio on a TCS Intercom. There a several projects out there who have revers engineered the bus protocol. I got it working to see activity on the bus when someone rings the ...
Marc's user avatar
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Low Side Bus One Shot

I'm confused on what exactly a one shot is and how to identify it on prints. For this example I know there is supposed to be a one shot on the low side of a 69 kV / 12 kV bus, but I'm not sure how ...
Redwood's user avatar
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Is energy lost on a powered, long, but unused DC power line? And how?

I am designing a super low power sensor system with a master and multiple, simple clients connected with a 4 wire bus (differential signals, GND, DC low voltage VCC on shielded twisted pairs). The ...
MoonCactus's user avatar
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1 answer
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EMC and Control Area Networks [closed]

With radiated EMI tests, do we need to take into account the communication cabling and its influence on EMI? I can't seem to find one standard that describes how CAN busses should be configured in EMI ...
Tony's user avatar
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3 answers
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What does it mean for a digital logic signal to qualify another signal?

The wishbone specification refers to signals being qualified by other signals: The strobe output [STB_O] indicates a valid data transfer cycle. It is used to qualify various other signals on the ...
Barabas's user avatar
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13 votes
4 answers
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How were standard serial port baud rates chosen?

How were standard serial port baud rates chosen? 1200, 9600, 115200, aren't the numbers we'd expect (powers of 2 or 10), but don't seem random either. Wikipedia states Many of these standard modem ...
SRobertJames's user avatar
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Understanding ISO-TP, Flow Control and Blocksize

I am currently trying to understand can communication using the ISO 15765-2 (ISO-TP) and Unified Diagnostic Services (UDS) Protocols using can. At this point I have a question about the Flow Control ...
Skobo Do's user avatar
3 votes
2 answers
165 views

Difference between Single-supply and Dual-supply CAN Transceiver

I was about to choose the MCP2558FD CAN Transceiver for a personal project. I found on the datasheet the following diagram: If my understanding is good, I can use it as a dual-supply Transceiver. But ...
Bouboubi's user avatar
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Kicad: Net is graphically connected to bus but not a member of that bus

Why is KiCad 7.0.7 complaining that these wires aren't part of the bus, when I've literally labelled the bus A[18..1] and ...
Sod Almighty's user avatar
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2 votes
1 answer
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Connect two peripherals on the same SPI bus with RP2040

I'm using a RP2040 for a personal project. I'm already using the SPI0 with GPIO 3 to 6, and SPI1 with GPIO 11 to 14. Is it possible to use the SPI0 with GPIO 16 to 19 at the same time with another ...
Bouboubi's user avatar
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3 votes
2 answers
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Design breakable PCB for power distribution bus

I am trying to design a PCB for power distribution bus to clean up wiring mess when prototyping. Here's my plan: Long PCB with single trace for each copper plane. Put pads to distribute power along ...
slyx's user avatar
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3 votes
1 answer
121 views

Drive strength and termination on a 50MHz multi-card backplane bus

I'm helping someone design a spec for a computing ecosystem based on Z80 and Eurocard. One of the challenges is that we want to support modern Z80 chips clocked at up to 50MHz, which means we have to ...
Polynomial's user avatar
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Hierarchal Sheet - Bus - Abbreviate Contents

In an unrelated answer, user @Steven demonstrated that it is possible to abbreviate the bus contents of a pin label of a hierarchal sheet block. How is this accomplished, such that: • ...
kando's user avatar
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4 votes
3 answers
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Eyeballing bus capacitance

I would like to use single-wire half-duplex UART bus to connect together two STM32 controllers and one ESP32 module. They all will have diodes on TX and share one pull-up. The wiring uses 2m of common ...
Maple's user avatar
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Whats the point of SDI being "source/destination" identifier if 429 busses are only allowed to have 1 transmitter?

Every reference I've looked at for Arinc429 specification has something like this: Okay, pretty simple. There is only one transmitter and up to 20 receivers. However, the name of the SDI (source/...
MFerguson's user avatar
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2 votes
0 answers
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Genesis ROM + Level Shifter Circuit: Game Fails Without O'scope Probe

Problem: In an effort to learn digital electronics, I've designed and had fabricated a modern Sega Genesis cartridge. But I'm having a problem getting the cartridge to work without the help of an ...
Nifty255's user avatar
2 votes
1 answer
157 views

MSP430 I2C no ACK send over Bus - updated but still not working

I'm trying to get an I2C communication with an MSP430 (MSP430G2231) working. This is the first time I'm using a MSP430 for I2C and not sure if I'm doing everything correctly. I have a Slave connected ...
ulix's user avatar
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150 views

CAN-Bus Message confusion

Can anyone tell me what the difference between these two sets of CAN Bus messages? This is from the manual of a Power Drive Unit (PDU) in the Cargo Handling System of a 747F (UPS Freight). This is the ...
joel cox's user avatar
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1 answer
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5:1 Mux design for a common bus system

I am tinkering with logic gates preparing for an exam and came across a question that states the following Construct a common bus system for six registers where each register has five bits. the ...
Weed Cookie's user avatar
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Can a PCI bus master access a device mapped in cpu memory space

If a PCI bus master can access memory space just as cpu can, can it put an address on the memory bus of the cpu that actually triggers a memory mapped I/O device to respond to that address. (As if the ...
John greg's user avatar
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1 vote
0 answers
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Does PCI require bus transaction routing

Does pci require routing mechanism in those 2 cases The two devices are on the same PCI bus and aren't seperated by a bridge. They aren't on the same PCI bus. I don't think it requires a routing ...
John greg's user avatar
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2 votes
2 answers
1k views

CAN-Bus: Wire Impedance vs Terminal Resistor

I'm seeing several pre-fabricated "CAN-Bus" cables with (2) DB9, 120 ohm terminal resistor connections, while the cable's impedance is 100 ohms. A. What is the purpose for this mismatch? B. ...
joel cox's user avatar
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132 views

How does data reach peripherals in STM32H7xx?

I'm trying to understand bus interconnection matrix in stm32h7xx. Here is a capture of the H753's one: In particular, I'm wondering how a data buffer located in DTCM would reach the SPI1's tx ...
Martel's user avatar
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ID collision on CANOpen SDO

I am working on a remote control module to control my heating boiler remotely. The boiler uses CANOpen 125k. My module transmits periodically SDO requests to read temperatures and other parameters. ...
h4rdc0der's user avatar
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2 answers
370 views

Sporadical CANbus "bus errors"

As a hobby project, I created an IoT module that allows to control and monitor heating boiler remotely over CAN bus. The bus runs at 125k and is relatively short. Usually, after a few hours of normal ...
h4rdc0der's user avatar
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324 views

Altium repeated harness connector

I would like to use a harness connector to connect two sheets in a multichannel design. If I do not repeat the sheets, the harness connector between them works well. It's better if I show it in ...
NNN123's user avatar
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-1 votes
1 answer
146 views

PCIe bus bandwidth

Calculate the bandwidth of a PCIe link with 8 lanes, 8b/10b encoding and 2.5 GHz frequency. I tried the following formula but I am not sure of its correctness: BW = lane data rate × encoding × no. of ...
Mina Mounir Farid Gendi's user avatar
1 vote
1 answer
77 views

CAN physical layer flexibility

I'm considering designing a CAN bus (CANopen) where part of the bus, closest to each node, does not use twisted pair. Partially the bus will run in a DSUB, but partially through stackable header or ...
NoobPointerException's user avatar
1 vote
1 answer
159 views

In a three-phase circuit, do all three phases connect to the same bus or are there three separate buses?

Below is a per-phase representation of a small power system from Power Systems Analysis (Grainger and Stevenson, p206). I'm trying to imagine the three-phase version of this circuit diagram. Let's ...
artist_and_not_EE_by_training's user avatar
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1 answer
389 views

BOSCH CAN 2.0 with ISO 11898 High Speed CAN

I'd like to use the PIC18F25K83-E/SS micro controller with the TCAN332 transceiver to implement a CAN node. In the PIC documentation it specifies the BOSCH CAN 2.0 standard while the TCAN322 specifies ...
Tzanker's user avatar
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2 votes
1 answer
110 views

Reading bus connections on a block diagram of an MCU

I'm trying to read and route the clock bus of GPIOB of this MCU from its block diagram. Normally another type of MCU block diagram is given as follows: So above is easy for me to say GPIOB is ...
ty_1917's user avatar
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Daily chain sensors with HIGH/LOW signal output

I'm working with 8 - 16 MTCH101 capacitive proximity sensors connected to one master MCU. Each sensor has a single output pin that is either HIGH or LOW. Is there a general-purpose IC that I can use ...
Jeremy Gillick's user avatar
2 votes
1 answer
1k views

Modbus TCP illegal packet (CRC) time-out problem in gateway

I am connecting a Modbus gateway to an RTU acquisition system. I am using a MOXA Gateway MB3480 with a RS485 (2 wires) connector. The thing is that I can't read the data all the time; I receive a time-...
Developing Electronics's user avatar
1 vote
2 answers
103 views

Hot-pluggable bus design review

I am currently designing a hot-pluggable bus system where a module is connected to its respective slot via a first mate/last break spring-loaded connector. I am using PJON, in specific PJDL on the ...
sephalon's user avatar
3 votes
3 answers
1k views

How can I design a CAN BUS hardware interface for STM32? (TTL and CMOS issue)

I am designing a PCB based on STM32F446 and I want to include CAN BUS communication. I know I need a transceiver (from CAN_H and CAN_L to TX and RX) and a CAN Controller. I have thought about MCP2551 (...
Developing Electronics's user avatar
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0 answers
332 views

STM32 CAN bus silent mode

I need to use the CAN bus simply to receive frame data (i.e. not transmit.) Can I use it in silent mode? I know that the main limitation of this mode is the fact that it does not transmit, so no ...
KaleM's user avatar
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1 answer
701 views

Solving different voltage for I2C pull-up resistors

I am designing my own PCB (based on the STM32F4). I am communicating with some devices using I2C. The thing is that this devices are connected to the I2C bus, which uses two 4.7 kΩ resistors (pull-ups)...
Developing Electronics's user avatar
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199 views

Does SPE (Single Pair Ethernet) require termination?

It is stated that it needs 100 ohm termination resistor but is it end of the each line externally?
alfonso's user avatar
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1 answer
172 views

Can M-LVDS be used as bus protocol?

https://www.analog.com/media/en/technical-documentation/application-notes/AN-1177.pdf In the document, it states that CAN is robust but M-LVDS is low power alternative of that. However, I couldn't be ...
alfonso's user avatar
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