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  • Ten Daily Electronic Common Sense-Section 102

    What are the stages of the control law accelerator pipeline?

    Fetch instruction 1 (F1), fetch instruction 2 (F2), decode l (D1), decode 2 (D2), read l (R1), read 2 (R2), execute (EXE), write ( W).

    What are the two overcurrent protection methods for the ISL6754?

    The ISL6754 has two overcurrent protection methods available to power supply designers.
    The first is cycle-by-cycle peak current protection, which provides fast response.
    The second method is the slow average current method. It produces a constant or “brick wall” type current limit if voltage type control. The average overcurrent protection also maintains the transformer flux density balance and protects the duty cycle of half a cycle.

    What is the intrinsic photoconductivity effect?

    The absorption of light by materials is divided into two types: intrinsic type and extrinsic type.
    When the photon energy is greater than the material’s band gap, the photon excites electrons in the valence band to the conduction band. Leaving free holes in the valence band, causing an increase in the conductivity of the material, is called the intrinsic photoconductivity effect.

    What are the three modes in which the FB current command UCC28610 works?

    The FB current commands the UCC28610 to work in three modes:
    Frequency Modulation Mode (FM);
    Amplitude Modulation Mode (AM);
    Green Mode (GM).

    PCB designers must be creative and learn how to implement those technologies while maintaining those design requirements?

    1. All power and ground lines should be distributed by the power supply using radial routing, so that the overall length of the lines is the shortest.
    2. Route ground and power lines in close proximity (parallel) to each other. This minimizes the effect of those high frequency switching noise (inside the component) loop currents on other circuits and control signals. Ideally, these line spacings are best kept larger than one line width. Only when connecting decoupling capacitors, the line spacing requirement must be greater than one line width. Noise signal flow should be parallel to these return paths.
    3. Do not connect different branches of the branch-shaped routing to avoid loop currents. It should be noted that for high frequency applications, it is necessary to control the surface impedance of all signal traces and the corresponding return paths of the traces. For low frequency applications, the line impedance does not have to be controlled but the routing topology must be controlled.

    What are the main types of ARM9 series microprocessors?

    ARM9 series microprocessors mainly include 3 types: ARM920T, ARM922T and ARM940T, which are suitable for different applications.

    What are the general waveform comparison steps?

    The general waveform comparison roughly requires the following steps:
    Specify the data set or simulation process to be compared;
    Specify the boundaries and signals of the comparison;
    run the comparison process;
    Check out the comparison results.

    What are the two types of IC cards?

    • Contact IC card
    • Contactless IC Card

    What is the main task of the AFE?

    The main task of AFE is to detect overload and short circuit faults. And protect charging and discharging MOSFETs, battery cells and other components on the circuit to avoid overcurrent conditions.

    How many layers does the Nios II architecture go from hardware to software?

    The Nios II architecture can be divided into three layers from hardware to software: hardware control layer, device driver layer, and hardware abstraction layer (Hardware Abstraction Layer System Library, HAL).
    Each layer is a higher-level encapsulation of the previous layer, so that the application program no longer directly controls the hardware device, but calls HAL_APl to drive it.
    In the eyes of developers, the interface between the device driver layer and the hardware control layer is an abstraction of a set of registers. Therefore, in the software implementation of the higher-level HAL, you can often see the write register function similar to IOWR (base address, offset, data) and the read register function of IORD (base address, offset).


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