1. Why USB called Universal Bus?
  2. What advantages does USB bring compared to traditional RS232 connection mode
  3. List down various speed that USB1.1 supports
    1. USB1.1 : FS (12MBits/s), LS(1.5MBits/s)
    1. USB2.0 : FS, HS(480Mb/s)
  4. How many ports does USB PHY has
    1. What is benefit of differential transmission using D+/D-
  5. USB is host controlled; explain what is meant by host controlled?
  6. USB uses tiered star topology; explain this architecture using diagram
  7. Benefits of tiered star topology compared to Daisy chain topology?
    1. Power to each device can be monitored and even switched off if an overcurrent condition occurs without disrupting other USB devices.
    1. Both high, full and low speed devices can be supported, with the hub filtering out high speed and full speed transactions so lower speed devices do not receive them.
  8. 127 devices can be connected to USB host, where does this limitation come from?
    1. How do we ensure more USB devices can be connected to same laptop
      1. Hint: Add another port/host
  9. List down various USB host controllers
    1. USB1.1
      1. UHCI
        1. More burden on S/w, allows for cheaper hardware
      1. OHCI
        1. More burden on H/w, makes for simpler software
    1. USB2.0
      1. EHCI
  10. USB uses a NRZI (Non return to zero invert) encoding scheme to send data with a sync field to synchronize the host and receiver clocks. Explain significance of Sync and NRZI concept.
  11. USB support plug’n’play, explain
  12. What is significance of USB drivers? What is their role in interfacing USB devices to the Host?
  13. List down various transfers USB supports.
  14. List down various components involved in a USB architecture
    1. Host
    1. Host Controller Interface
    1. USB Link
    1. USB Core
    1. USB function controller

Teacher is an important part of anybody's education.

I completed my post graduation in 2005. During my school and College, I always had difficulty coping up with things in classroom. But my Telugu teacher Mr. Hussain Budde during my 7th class , I used to enjoy his way of teaching, way he used to engage students by teaching lessons as stories. After that, I never found any teacher who kept sessions so much engaging. I don't want to blame my teachers, I always felt they could make sessions more engaging. I always had to spend time outside class hours to cope up with every minute of classroom session.

I as a teacher, adopt a style of teaching which keeps session engaging and ensures that students give 100% focus on the session. I always wanted to be that one teacher, whom my students will remember for lifetime. I am making sure that, rest of trainer's also follow same.

I want your 6 months of education at VLSIGuru to be among your best learning experiences. We at VLSIGuru will do our best to make this a memorable time.

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