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Architecture first, packets later
Host-centric model, tiered-star topology, and the enumeration sequence before bit-level packets — the mental model that turns USB from a spec into an engineering discipline.
Interview-ready depth
A dedicated interview module plus per-chapter interview weighting — enumeration, endpoints, transfer-type selection, scheduling, xHCI architecture, silicon-bring-up debug.
Design → verify → debug
Device-controller RTL (endpoints, FIFOs, protocol FSMs), SVA / UVM verification with VIPs, and protocol-analyser-driven debugging — the full engineering loop.
USB Complete Curriculum
Your Learning Roadmap
180 chapters · 31 modules — host-centric architecture, enumeration, endpoints, and xHCI scheduling.
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Module 1
Why USB Exists
1.1The Peripheral-Connectivity ProblemPlanned1.2Legacy Peripheral InterfacesPlanned1.3RS-232 RecapPlanned1.4The Parallel PortPlanned1.5PS/2 Keyboard / MousePlanned1.6Why USB Was CreatedPlanned1.7The Universal-Connectivity VisionPlanned1.8USB Evolution TimelinePlanned
Module 2
USB Architecture Overview
2.1The USB HostPlanned2.2The USB DevicePlanned2.3USB HubsPlanned2.4The Root HubPlanned2.5The Host ControllerPlanned2.6The Host-Centric ModelPlanned2.7USB TopologyPlanned2.8Tiered-Star ArchitecturePlanned
Module 3
USB Physical Layer
3.1USB Signalling OverviewPlanned3.2Differential SignallingPlanned3.3The D+ LinePlanned3.4The D- LinePlanned3.5Pull-Up ResistorsPlanned3.6Pull-Down ResistorsPlanned3.7Speed DetectionPlanned3.8Electrical FundamentalsPlanned
Module 4
USB Generations
4.1USB 1.x ArchitecturePlanned4.2USB 2.0 ArchitecturePlanned4.3USB 3.x ArchitecturePlanned4.4USB4 ArchitecturePlanned4.5Architectural EvolutionPlanned4.6Speed ImprovementsPlanned4.7USB Backward CompatibilityPlanned
Module 5
USB Speed Modes
5.1Low Speed (LS)Planned5.2Full Speed (FS)Planned5.3High Speed (HS)Planned5.4SuperSpeed (SS)Planned5.5SuperSpeed+ and BeyondPlanned
Module 6
USB Enumeration
6.1Device ConnectionPlanned6.2USB ResetPlanned6.3Address AssignmentPlanned6.4Descriptor DiscoveryPlanned6.5Configuration SelectionPlanned6.6End-to-End Enumeration FlowPlanned6.7Enumeration TimingPlanned
Module 7
USB Descriptors
7.1Device DescriptorPlanned7.2Configuration DescriptorPlanned7.3Interface DescriptorPlanned7.4Endpoint DescriptorPlanned7.5String DescriptorPlanned7.6BOS DescriptorPlanned
Module 8
USB Device States
8.1Attached StatePlanned8.2Powered StatePlanned8.3Default StatePlanned8.4Addressed StatePlanned8.5Configured StatePlanned8.6Suspended StatePlanned
Module 9
USB Endpoints
9.1The Endpoint ConceptPlanned9.2Endpoint AddressingPlanned9.3Endpoint NumbersPlanned9.4Endpoint DirectionPlanned9.5Endpoint BuffersPlanned
Module 10
USB Transfer Types
10.1Four Transfer Types OverviewPlanned10.2Control TransfersPlanned10.3Bulk TransfersPlanned10.4Interrupt TransfersPlanned10.5Isochronous TransfersPlanned
Module 11
USB Packets
11.1Token PacketsPlanned11.2Data PacketsPlanned11.3Handshake PacketsPlanned11.4SOF PacketsPlanned11.5USB Packet StructurePlanned11.6CRC in USBPlanned
Module 12
USB Transaction Model
12.1Token StagePlanned12.2Data StagePlanned12.3Handshake StagePlanned12.4Transaction FlowPlanned12.5Transaction Timing RelationshipsPlanned
Module 13
Control Transfers
13.1Setup StagePlanned13.2Data StagePlanned13.3Status StagePlanned13.4Standard Device RequestsPlanned13.5Enumeration as Worked ExamplePlanned
Module 14
Bulk Transfers
14.1Bulk ThroughputPlanned14.2Bulk ReliabilityPlanned14.3Bulk RetriesPlanned14.4Bulk for Storage DevicesPlanned14.5Bulk for Data StreamingPlanned
Module 15
Interrupt Transfers
15.1The Polling ModelPlanned15.2Keyboards on USBPlanned15.3Mice on USBPlanned15.4Interrupt Latency RequirementsPlanned
Module 16
Isochronous Transfers
16.1Audio over IsochronousPlanned16.2Video over IsochronousPlanned16.3Real-Time Data StreamsPlanned16.4Bandwidth ReservationPlanned16.5Isochronous Error-Handling TradeoffsPlanned
Module 17
USB Scheduling
17.1Frame Scheduling (1 ms)Planned17.2Microframe Scheduling (125 µs)Planned17.3Host Scheduling AlgorithmPlanned17.4Bandwidth AllocationPlanned17.5Transaction Timing on the BusPlanned
Module 18
USB Hubs
18.1Hub ArchitecturePlanned18.2Port ManagementPlanned18.3Downstream Device DiscoveryPlanned18.4Cascading HubsPlanned18.5Hub Power ManagementPlanned
Module 19
USB Power Management
19.1Bus PowerPlanned19.2Self PowerPlanned19.3SuspendPlanned19.4ResumePlanned19.5Remote WakeupPlanned19.6Power BudgetingPlanned
Module 20
USB 3.x Architecture
20.1SuperSpeed ConceptsPlanned20.2Dual-Bus ArchitecturePlanned20.3Link TrainingPlanned20.4USB 3.x PacketsPlanned20.5USB 3.x vs USB 2.0 DifferencesPlanned
Module 21
USB Device Controller Design
21.1Endpoint LogicPlanned21.2FIFO ArchitecturePlanned21.3Descriptor EnginePlanned21.4Protocol EnginePlanned21.5Controller FSMsPlanned
Module 22
USB Host Controller Overview
22.1EHCI OverviewPlanned22.2xHCI OverviewPlanned22.3Host-Side SchedulingPlanned22.4Host Resource ManagementPlanned
Module 23
USB RTL Design
23.1Device Controller RTLPlanned23.2Endpoint RTLPlanned23.3FIFO DesignPlanned23.4Protocol FSMsPlanned23.5Timing ConsiderationsPlanned
Module 24
USB Verification
24.1USB Protocol CheckersPlanned24.2USB AssertionsPlanned24.3USB ScoreboardsPlanned24.4USB Functional CoveragePlanned24.5USB VIP UsagePlanned24.6UVM Architecture for USBPlanned
Module 25
USB Debugging
25.1Enumeration FailuresPlanned25.2Descriptor IssuesPlanned25.3Endpoint ProblemsPlanned25.4Transfer ErrorsPlanned25.5CRC ErrorsPlanned25.6Power IssuesPlanned25.7Using a Protocol AnalyserPlanned
Module 26
USB in SoCs
26.1USB Controllers on SoCPlanned26.2DMA IntegrationPlanned26.3AXI Interfaces to USBPlanned26.4USB Interrupt IntegrationPlanned26.5Firmware InteractionPlanned
Module 27
USB Interview Mastery
27.1What Is USB?Planned27.2Host / Device / Hub IdentificationPlanned27.3Enumeration QuestionPlanned27.4Endpoints QuestionPlanned27.5Transfer-Types QuestionPlanned27.6Scheduling QuestionPlanned27.7Senior Host-Controller ArchitecturePlanned27.8Senior Verification StrategyPlanned27.9Senior Silicon DebugPlanned27.10Senior Architecture TradeoffsPlanned
Module 28
USB vs Other Protocols
28.1USB vs UARTPlanned28.2USB vs SPIPlanned28.3USB vs EthernetPlanned28.4USB vs PCIePlanned
Module 29
Real Industry Case Studies
29.1USB Flash DrivesPlanned29.2USB WebcamsPlanned29.3USB Audio DevicesPlanned29.4Smartphones over USBPlanned29.5USB in Embedded DevicesPlanned29.6USB on FPGA Development BoardsPlanned
Module 30
USB Design-Review Checklist
30.1RTL Review ChecklistPlanned30.2Verification Review ChecklistPlanned30.3Compliance Review ChecklistPlanned30.4Integration Review ChecklistPlanned30.5Debug Review ChecklistPlanned30.6Interview Review ChecklistPlanned
Module 31
USB Misconceptions Engineers Have
31.1“USB Is Point-to-Point Only”Planned31.2“USB Devices Initiate Transfers”Planned31.3“Endpoints Are Physical Ports”Planned31.4“Bulk Transfers Are Always Fastest”Planned31.5“Enumeration Is Optional”Planned31.6“USB 3.x Is Just Faster USB 2.0”Planned