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Create an image of a modern computer bus architecture with various connections and devices, showcasing diagrams of PCI Express, I2C, SPI, and VME buses in a visually appealing layout with labels.

IOSPD Exam - Buses Quiz

Test your knowledge on various bus architectures used in computing systems with our comprehensive IOSPD Exam Quiz. This quiz covers a broad spectrum of topics including PCI Express, I2C, SPI, and VME buses.

16 engaging questions
Multiple-choice format
Ideal for certification preparation

16 Questions4 MinutesCreated by ConnectingData57

A PCI Express link:

- Requires at least four wires.

- May contain any number of communication lanes.

- Consists of bidirectional channels.

- Can contain up to 32 communication lanes.

- Utilizează o frecvență a semnalului de ceas care este setata în mod automat de sistemul de operare.

- Conține benzi de comunicatie, fiecare fiind implementată ca un singur canal de comunicatie bidirectional.

PCI Express interrupts:

- In legacy mode, are signaled by devices with the INTA# … INTD# interrupt request signals.

- In legacy mode, use special messages that act as interrupt request signals.

- In legacy mode, they use special messages that indicate signal activation for interrupt requests.

- In native mode, are signaled with memory write transactions.

- In native mode, they are signaled through message transitions specific to PCI Express bus.

PCI Express bus:

- It is software compatible with PCI parallel bus.

- Permits only point-to-point connections.

- It does not require synchronization between signals, compared to PCI parallel bus.

The parallel PCI bus:

- Uses a priority-based arbitration algorithm.

- Requires to use either a series or a parallel bus termination.

- Does not require extra clock cycles for arbitration procedure.

With the I2C bus:

- Full duplex communication is NOT possible.

- Duplex communication is NOT possible.

- Each device has a unique address assigned to it.

- The device address and the data direction is transmitted after START condition.

- Transfer rate is reduced compared to SPI bus.

- No acknowledge bit sent.

- Each data transfer begins with a START bit and is followed by a STOP bit.

With the SPI bus:

- Data is transferred in both directions simultaneously.

- Advantages are achieved when there is a single slave device.

- It is more efficient for applications that require duplex communication.

- It does NOT allow device addressing through a unique/specific address for each device.

- An acknowledge bit is sent after each data word.

- Transfer rates are similar to those of the I2C bus.

- It is more advantageous for systems with many/more “slave” devices.

Select the cases when using the SPI bus is more advantageous than using the I2C bus:

- The system contains several slave devices.

- The data rate required is 5 megabits per second.

- The word size is 12 bits.

USB 3.2 doubles the transfer rate of USB 3.1 by:

- Operating on two lanes.

- Adding a new communication lane.

- Using a more efficient encoding compared to version 3.1.

- Doubling the clock frequency.

USB 3.0 version

- Adds 2 unidirectional differential channels in addition to the existing differential channel (from 2.0 version).

- Replaces the existing differential channel with 2 unidirectional channels.

- Adds a bidirectional (duplex) differential channel to the existing differential channel.

With isochronous transfers on the USB bus:

- Data is always delivered/provided on time.

- There can appear losses in data stream/flow.

- Provided data is always correct.

- The transfer rate depends on other activities on the bus.

- Transmission errors are corrected by retransmission.

VME64x bus uses a modified protocol which:

- Uses both fronts (edges) of strobe and ACK signals for data transfer.

- Is a source synchronous protocol.

- Uses both clock signal fronts (edges) for data transfer.

VME64x bus:

- Allows adding and eliminating extension modules without shutting down the system.

- Uses 2eVME (Double-edge VME) protocol at which data transfer takes place at both clock edges.

- Can use extension modules with convection cooling, with special guides of boards that transfer the heat to the chassis.

VXS Modules (VMEbus Switched Serial):

- Uses switching boards that have point to point connections with the rest of the boards.

- Can use a dual star topology, by which every normal board connects at 2 switching boards (redundancy).

- Can be used for different serial interconnections, without changes.

- Can use a mesh topology, by which all normal boards interconnect (without a switching board).

- Can use a daisy-chain topology, with the switch board and payload boards connected in a chain.

- Uses normal boards, on which the parallel connectors are replaced by high speed serial connectors.

- Uses payload boards, at which the parallel connectors are replaced with high speed serial connectors.

- Replaces completely the parallel VME bus with serial interconnections.

- Uses a differential clock signal between devices.

With the VME320 bus:

- A source synchronous protocol is used.

- The data transfer protocol uses both edges of the clock signal for data transfers.

- All expansion modules are connected in series.

Magistrala VME320 utilizează un protocol modificat, care:

- Este sincron la sursa datelor în timpul fazelor de date.

- Este asincron în timpul fazelor de adrese.

Utilizează ambele fronturi ale semnalului de ceas pentru transferul datelor.

Compared to a parallel bus, a serial bus:

- Allows synchronization simplification when an external clock signal is transmitted separately of data.

- Have lower electrical interferences because it needs fewer wires.

- Has lower speeds because data is transferred serial, bit by bit.

IOSPD exam - Buses

IOSPD Exam - Buses Quiz

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