is a subsystem that transfers a plurality of digital bits grouped together to achieve or represent a common function or variable.
0
votes
1answer
53 views
What is the reason that Bus resistance is normally small
I have seen typical bus resistance as few ohms. For example on MAChX02 1200 ZE board the bus that connects FTDI chip and the FPGA has only around 11 Ohm resistance.
Is there any specific reason for ...
0
votes
1answer
72 views
How can a simple operation such as moving data from one register to another can be encoded into an instruction and executed in a single clock cycle.? [closed]
The simple point I'm trying to make for an essay Im writing. I'm completely at a loss as to how to answer this. Any help available? Sorry, I know this is not a well formed question but I've got no ...
1
vote
1answer
26 views
Power delay profile and broadband bus
I came across the following solved question, but I have trouble understanding part of the solution. If anyone could shed some light into this I would be really grateful since this problem has been ...
0
votes
2answers
122 views
Voltage level in an open drain bus (I2C)
I have a setup as seen in this image:
The question is what will the voltage at the line on the left size (marked with [Volt ??] ) be when the open-drain logic is active? The goal is to have a logic ...
1
vote
1answer
117 views
how to make thin-traces handle high current [duplicate]
According to The Circuit Calculator my 18 amp traces on 4 oz copper need to be about 160 mils. Only problem is I don't have room for this.
I've seen boards use raised bus bar and also solder bus ...
0
votes
1answer
162 views
Can I remap a car\bike ECU using CAN bus?
I am thinking to use something like this to connect an Arduino to a motorbike engine control unit (ECU): Arduino CAN-Bus Shield with uSD Card Holder.
I never did something like this; using CAN bus, ...
4
votes
0answers
99 views
Help to identify unknown Sync Serial Bus
Does somebody already seen a sync serial bus communication like that ?
Repeated Pattern :
Detail of beginning :
I fail to identify it...
it look like I2C but :
it have a clock at 2MHz (so ...
2
votes
2answers
130 views
Best microcontroller electrical bus for high speed synchronized sampling from slaves
I have an application which requires that I sample a dozen of sensors for each node and transmit the data to a master microcontroller in regular four second intervals. The surface area of the sensors ...
2
votes
0answers
62 views
What does register and bus size depend on?
So here is a hardware sequential multiplier depicted. Number A is 51 bits width, number B is 48 bits width. I have to choose the most efficient size of buses and registers (optimize according to ...
6
votes
2answers
189 views
Data bus between uC and SRAM: what happens when both are writing concurrently?
My understanding of interfacing a standard SRAM chip is the following: When the host wants to write, the OutputEnable# is driven high to bring the SRAM data bus to High-Z and the host is driving the ...
1
vote
3answers
136 views
Connecting n bit bus from one component to another
I think I didn't explain myself correctly. Let me tell you in more detail.
I have 64 blocks: A, B, C, D ..... Each of these blocks is a parallel in parallel out shift register of n bits. The task of ...
1
vote
1answer
63 views
PS/2 info search
Could you please help me find information about PS/2 protocol?
I am currently writing a topic for an exam, it is about serial buses. What I need is to be able to create a suitable circuit to connect ...
0
votes
1answer
93 views
1
vote
2answers
130 views
Is this bandwidth calculation exactly correct?
Calculating bandwidth for a data bus is like the following in a text I read:
"The bus cycle speed is 200 MHz with 4 transmits of 64 bits per clock cycle. The bus bandwidth is then 200*4*64/8=800*64/8 ...
2
votes
2answers
158 views
Using Ethernet Bus
While reading about the Ethernet protocol, I noticed that it has bus features like collision resolution. I've only ever seen Ethernet networks using a star topology (a bunch of PCs connected to a ...
4
votes
5answers
671 views
Does the size of the data bus control the maximum value the CPU can process?
I know the data bus size defines the size of the processor, but can the processor actually process data above that limit?
Would really appreciate some explanation on this.
1
vote
4answers
269 views
Computer bus frequency and electricity frequency
From http://en.kioskea.net/contents/pc/bus.php3
A computer bus is characterised by the amount of information that can be
transmitted at once. This amount, expressed in bits, corresponds to
...
2
votes
2answers
285 views
CU or ALU? What communicates with memory?
I have different books saying different things. Are the address bus and data bus connected to the CU or the ALU? The control bus connects to the CU right?
3
votes
1answer
1k views
How to use Altium Buses?
I am new at Altium, I am trying to connect 8 wires but using a bus. I have read about this in Altium's web page but I doesn't explain too much about how to connect buses on the way I need. I want to ...
5
votes
1answer
196 views
One-clock increment operation in a three-bus CPU architecture
In his chapter on CPU design, Edward Bosworth introduces the following three-bus architecture:
One of the main design aims of this circuit is to be able to increment the program counter PC in a ...
0
votes
0answers
106 views
How can I simulate an FST3126 4x bus using Multisim
I'm trying to simulate a circuit in Multisim that contains an FST3126 4x bus switch. Here's a link to the Data sheet and I copied a portion of the logic diagram below for reference. Anyway Multisim ...
1
vote
1answer
124 views
Can I use a PC/104plus board on a PCI-104 connector
The problem is: I have a miniPCI card that I need to attach to a motherboard that only has an PCI-104 connector available for expansion. So i found an adapter that is a PC/104plus to MiniPCI adapter. ...
2
votes
2answers
228 views
Addressable simple serial bus for medium distances using PIC microcontrollers?
I am looking for serial bus, that could have addressable nodes, with maybe max. 30 nodes. I don't need multi-master, and the speed is not an issue.
The distance between the nodes could be something ...
4
votes
3answers
189 views
Multidrop one or two lane bus
I like to design a single master, several slave (up to 100) application and looking for a reliable (up to 30meter) multi drop bus. One or two lane is preferred, I will use daisy chain topology ...
5
votes
4answers
361 views
CPU in circuit emulator
Idea:
Run a 68000 emulator on a PC, and connect the PC to an existing 68000 system, replacing the CPU with a ribbon cable going to the PC.
I realize the emulation would not be cycle exact, but that ...
3
votes
4answers
156 views
Low cost/complexity bus for expandable modules?
I'm trying to pick a bus for an expandable system. Requirements would ideally include:
Unknown number of modules (potentially up to a couple dozen).
Multiple identical modules are allowed (giving ...
4
votes
1answer
217 views
Microcontroler with external bus
I am looking for some microcontroler with external bus for program memory, and witch is supported by GCC.
I read this Atmel ATSam3U datasheet (I have no experience with this familly, yet) and there ...
0
votes
6answers
331 views
Memory-mapped I/O address ranges
In Memory-mapped I/O, how does device allocation and address ranges are decided? For instance like, EPROM has control over address bus for address from > 0x0000 and <0x4000, RAM1 from 0x4000 to ...
1
vote
1answer
333 views
Creating a bus port in custom made part in LogicWorks
I'm creating some parts in LogicWorks and instead of having individual pins for input and output I want to use a bus pin. I can't seem to figure out how to make the bus pins appear in the part ...
1
vote
1answer
276 views
Pull-down's on CPLD
So I have a Xilinx CoolRunner II CPLD that I'm working with that is talking to conditionally powered peripherals. I'm using the CPLD as a kind of logic level translator between a microcontroller and ...
5
votes
2answers
180 views
Bus enable integrated circuit
I am toying with designing a simple 8-bit CPU out of basic logic components. I have a fairly good idea of how my ALU and registers will interact, but the one thing I feel can use some improvement is ...
5
votes
3answers
142 views
Designing a bus - Master at one end or in the middle?
I am laying out a data bus at the moment (initially on breadboard), and I am wondering if there is a 'right' way to lay it out. I have a CPU acting as the bus master, and a number of devices (RAM, ...
0
votes
0answers
872 views
What are good resources for learning SDIO bus interface?
I am currently looking for good online tutorials and reference code to understand SDIO bus interface, especially the i/o commands CMD52 & CMD53. I have gone through SDIO spec at sdcard.org, but ...
2
votes
2answers
613 views
How Does a Wired AND/OR Bus work
Studying for an exam
Looking at Data buses using Wired AND and Wired OR configurations.
Using tristate logic, a device is able to gain control of the bus and transmit anything down it.
I don't ...
0
votes
2answers
169 views
How does using memory with more bits allow you to reduce the address bus?
If you are using a CPU to address one 2MB memory module, then since 1MB = 220 and 2·220 = 221 = 2MB, you need 21 address lines.
If you use a 2MB 16-bit memory module instead, you can remove address ...
6
votes
6answers
443 views
Multi node bus options
I want a master node consisting of a TI Stellaris Cortex M3 core connected to what can be up to 32 slave nodes of TI MSP430 (or possibly more Stellaris slave nodes). These will be maximally 0.5 meters ...
1
vote
2answers
1k views
Interface netduino with Iphone via audio jack
I am interested in making the netduino establish a BUS connection to the IPhone via the audio jack. Does anyone have any experience doing this? I have read a few things online...but I am somewhat ...
2
votes
2answers
586 views
Debugging a LPC23XX based CAN bus sniffer
I am trying to get a CAN bus sniffer working, based on LPC2368. I keep getting a bus error interrupt, of type "form error". I suspect my timing settings. I verified that the sending party is ...
8
votes
5answers
555 views
What is the most popular embedded serial bus? [closed]
I'm designing an embedded device that I would like to make interoperable with third party peripherals through a serial bus. Should I choose SPI, I²C, or some other bus?
The peripherals will be ...
