is a subsystem that transfers a plurality of digital bits grouped together to achieve or represent a common function or variable.
1
vote
3answers
79 views
Does a helicopter battery drain when it is “off” but attached to a battery hot bus?
I'm reading about the DC Power System for a civilian helicopter.
It shows the following diagram for when the battery is off:
However, it shows that the ...
0
votes
2answers
51 views
Big address space and small physical size?
The Intel D1000 MCU datasheet says:
The MCU has 4 kB of data flash and 32 kB of code flash. Code flash
occupies the address range 0x2000 0000 to 0x3FFF FFFF and is aliased
throughout. It is ...
1
vote
1answer
73 views
Can I connect a CAN node with 250 kbit/s to a CAN bus running at 500 kbit/s?
I'm trying to connect an automatic car gearbox which is using the CAN bus at 250 kbit/s to car with bus speed 500 kbit/s.
Is it possible to have nodes with different speeds on the CAN bus?
...
0
votes
1answer
83 views
Why we can't use AHB in the Cortex M0 MCU?
I found coretex M0 MCU module's bus interface has not HBUSREQ and HGRANT, and HRESP when i trying to implement with AHB Bus.
Is there any way to use AHB not AHB_lite. I can't use multi-layer ...
2
votes
1answer
98 views
Using an array of resistors to give priority on a bus
I remember that the ZX Spectrum used an array of resistors to let the output from one chip override the output from another chip (on a bus) when both had the ¬oe pulled low.
...
0
votes
1answer
52 views
DC Bus for Solar Charge Controller Battery
I am just learning the set up for a back up power. I am just wondering whether the DC output from the charge controller or the battery can be used for multiple loads.
For example, I want to power my ...
1
vote
1answer
47 views
Multiple DC Voltage sources in parallel
I'm building an alarm system (paradox EVO192 with ZX8 extension modules) and was hoping to have separate sections of the system each powered by it's own battery backed up power supply (something like ...
0
votes
1answer
21 views
Altium bus connections with sheet hierarchy
I am using a bus to connect a repeating module to an MCU in Altium. I've tried numerous variations and can't find an example the same as this. I'm not sure which should have labels and which shouldn't ...
2
votes
3answers
114 views
Are there any standard FPGA internal buses?
Are there any standard FPGA internal buses?
I've always used some sort of bidirectional bus between my internal blocks, but is there a standard way of doing this?
0
votes
2answers
83 views
Using two pressure sensors with same address over I2C
I'm a novice programmer and I have recently purchased the SparkFun Pressure Sensor Breakout - MS5803-14BA and used it to take pressure readings quiet easily with the sample code provided and an ...
1
vote
0answers
36 views
Transaction ID implementation in AXI AMBA bus
Now I'm trying to study in AXI AMBA bus.
As I know, we can give some ID to the master and slave. But I don't know what exactly how can we give the ID to them.
for example,
What if I have 7 Master ...
1
vote
1answer
55 views
Using different termination types on CAN bus
Is it possible to terminate one end of a CAN bus using Standard termination (single 120 ohm resistor across CANH and CANL) and the other end using Split termination (two 60 ohm in series with a ...
0
votes
1answer
99 views
Communication over DC Bus at low data rate
I am looking for a solution to modulate a data signal into a DC powerline that has 12-60V.
I found for example the DC-Bus solution from Yamar. But they are the only ones offering this and their chips ...
0
votes
2answers
36 views
Redundancy for a databus transmission
I'm going to start a project in my University in a few week. Since it is a collaboration between my University and a very important company I cannot say too much about the project itself. So I try to ...
-2
votes
1answer
47 views
How is data transmitted on different media? [closed]
Thinking about computers primarily, I'm trying to get my head around how data is transmitted along various transmission media. In particular, I'm getting confused between the use of electromagnetic ...
1
vote
3answers
104 views
Why can't masters talk to each other in a I2C bus?
I came across an I2C article which lead me to a question. Specifically this part is creating some confusion:
"Also, unlike SPI, I2C can support a multi-master system, allowing more than one master to ...
1
vote
0answers
61 views
Protocol used by tankless water heater remote control
I'm using an EcoSmart ECO 11 electric tankless water heater in a hydronic system.
This heater has a "Remote Control" port on the side. The port is an RJ-11 jack with 4 wires.
I want to interface ...
0
votes
1answer
61 views
Could someone explain attached M-bus master circuit?
Could someone explain attached m-bus bjt circuit in details?
Is this a repeater of some sort?
0
votes
1answer
37 views
Different bus representations on schematics?
Here is an excerpt from a sample "data flow" diagram:
Now both lines in both circles represent buses but in #2, there is no bus arrow that goes to the IC.
What is the difference between them? Does ...
2
votes
1answer
42 views
Differential bus transmission
I am working at a project which requires an application which has some devices connected through a bus (RS-485 || CAN), I haven't decided yet.The problem is that some of this devices are hot pluggable ...
6
votes
2answers
118 views
Why do PC bus frequencies often end in multiples of 33MHz?
It seems like there are a lot of frequencies for different system buses that end in 33 or 66MHz. Is there a particular reason for this?
2
votes
4answers
110 views
purpose of termination resistor
My question is not about a particular bus or line and the termination I should put on it.
I know some busses need termination resistor like CAN or adress/data for memories.
If I understood well these ...
-2
votes
1answer
100 views
Where is the control, address and data bus in a computer
So have been reading up on data buses, address buses and control buses and I understand what they do, but am confused about where they can physically be found. Some books/sites I have found state that ...
8
votes
1answer
287 views
enable/disable PCI interrupts
I'm implementing a PCIe driver, and I'd like to understand at what level the interrupts can be or should be enabled/disabled. I intentionally do not specify OS, as I'm assuming it should be relevant ...
2
votes
1answer
62 views
RS-422 for pseudo-multipoint bus topology?
I have been trying to get a definitive answer on the possibility to use RS-422 for connecting one master and several slaves in a pseudo-multipoint/bus fashion, with slaves being able to send some data ...
0
votes
1answer
46 views
Directionable parallel in parallel out register
I have this problem. I have 3 devices that use 4bit PIPO registers to transfer each other data. I need to make the controller that select with device to use, so it will connect A with B, AC, BA, BC, ...
0
votes
1answer
284 views
Difference between buses and nets
In short, what is the difference between buses and nets? Read some questions that seemed somehow related but still it is not clear for me.
Related:
How to use Altium Buses?
http://www.xilinx.com/...
0
votes
1answer
167 views
What are the CPU activity steps for the fetch-decode-execute cycle
So in all the phases of the fetch-decode-execute cycle, it says that the "store" phase is used to store any resultant data from the execute phase. What are the CPU steps for that phase? I heard that ...
0
votes
1answer
100 views
Busbar calculation
I am looking formula and factor involved in calculating DCDB and ACDB busbar calculation in string combiner box. Please share link or example calculating bus bar.
choosing proper bus bar
effect of ...
4
votes
1answer
66 views
Coprocessor Synchronization
I have a coprocessor that uses some dedicated hardware 65c618 core that starts up in a halted state. Through a dedicated bus I can control the coprocessor I-RAM which is needed to setup the processor ...
3
votes
2answers
326 views
Confusion between register size, address size, data size
I started learning about pointers in C++ and I figured I should educate myself a bit on how memory works and is accessed. I read that when we say a processor is 64-bit, it has a 64-bit register and ...
0
votes
1answer
101 views
design for a PC/104 interface bus expansion
Can someone tell my why this won't work or tell me a better way to do it? I have a TS-5500 from Technologic Systems that has a PC/104 bus which I am building a card to expand the IO ports. Pin B19 on ...
1
vote
0answers
30 views
Specs for the 54622D oscilloscope expansion bus
Just bought a used HP/Agilent/Keysight 54622D oscilloscope. There is an expansion bus connector on the back. I've been looking around for the specs on the bus such as connector type, electrical ...
1
vote
2answers
184 views
How do devices with different external clock communicate between each other on a motherboard?
I don't have any pratical knowledge about eletronic circuit. Actually I am a high level software programer and I've just begin to learning about computer hardware and eletronics.
Basically, I ...
0
votes
1answer
73 views
How can I use a single 74595 to drive two different IC's?
I'm trying to build an audio circuit with as few parts as possible. Also, I really need to limit the number of pins used on my Arduino.
I didn't ask this in the Arduino site because I don't think ...
0
votes
1answer
77 views
DDR2 data rate and data bus confusion
I am reading on DDR2 memory from past few days and have got confused with some of the terms involved.
I am mainly confused from discrete memory (single DDR2 memory IC) rather than DIMM module which ...
2
votes
3answers
729 views
Buses in 8086 micro-processor
What are the buses known as A, B, C in the following architecture of 8086? I cannot find any information about these.
1
vote
1answer
388 views
Measure I2C bus capacitance
We are trying to calculate how many I2C slaves we can hook up the I2C bus.
We tried to run a square wave through a serial resistor and measure the rise time but we get a strange result. More nodes ...
5
votes
1answer
264 views
SPI Bus Termination Issue
I've been working on a project where an OMAP Linux SPI master interacts with 6 SPI slaves peripherals (5x A/D converters and single magnetometer).
I can set the SPI clock frequency and have ...
0
votes
1answer
101 views
Connecting unused MIPI data lane in schematics and PCB layout
Am using a MIPI to parallel bridge in one of my designs.The bridge takes in inputs from a MIPI camera and sends the parallel data to a processor.Am using only 2 data lanes (of the 4 data lanes) ...
3
votes
1answer
319 views
Bi-Directional Level Shifter Circuit with pull-down resistors
I'm looking for a bi-directional level shifter circuit to interface a 3.3V controller to a 1.8V component which is not 3.3V tolerant. Usually I'm using the well-known level shifter circuit, e.g., ...
0
votes
1answer
80 views
Is it safer to use multiple RS-485 point to point connections compared to a daisy chain?
When wiring multiple RS485 slaves to a master equipped with a RS232/RS422/RS485 interface*: is it safer to wire multiple point to point connections from the hub with their own termination resistor, ...
1
vote
2answers
162 views
Bus value if some pins are floating
I'm working on plugin for simulation software (digital IC only).
For example there is 8 bit bus.
User wants to read it's value. On plugin side I check each pin's state. It can be 1, 0 or undefined. At ...
5
votes
0answers
111 views
How reliable is a daisy-chained USB bus? What are the risks and how can they be minimised?
Introduction
USB has been around for quite a long time now, used extensively even in the automotive, marine and space industries to some extent. However certain communication ways are more reliable ...
2
votes
1answer
376 views
Kvaser Leaf Light CAN BUS Simulator problems
I'm learning to use this tool Kvaser Leaf Light V2 with CAN-BUS. I'm stuck with some problems. I can read the packets around the CAN-BUS line from the car, I can save it in a text file, but when I ...
1
vote
1answer
786 views
How to interface with credit card terminals?
I am considering doing a project that involves a machine that can accept credit card payment automatically from customers. Think of it as a vending machine, that accept credit card.
I want to out-...
4
votes
3answers
5k views
CAN bus simulation (automotive purpose) - tried Arduino and SparkFun
I repair electric powered steering systems for cars, especially Fiat, Alfa, and Lancya (Delphi manufacturers), and I'm in need of making some tool to test these reparations. I mean just turning it on, ...
0
votes
2answers
244 views
Can we observe addresses, data and other signals on the microcomputer buses by an oscilloscope, a LED or even an ordinary DC voltmeter?
Microcomputers are dynamic devices that are synchronized by a clock oscillator. So the signals (E, R/W, CS, A15-A0, D7-D0...) appear on their buses only for parts of a microsecond and, as the buses ...
1
vote
1answer
59 views
Verilog only assigns first bit of a bus
I'm trying to assign a 12bit parallel bus to a 12bit register. I've reduced the problem to this literal assignment but as with the previous case, only the first bit is being written to anything when ...
-1
votes
1answer
145 views
CAN installation running at 1 Mbit/s need to transfer 1024 bytes
What is the total number of data frames needed to transfer an entire 1024 bytes block?
Also, what is the minimum amount of time needed to complete this method?
