The contents of the USB4 specification include：
2 directories TMU Simulation and USB4 ECN for Release
a series of documents
Simulation catalog
USB4 ECN for Release
TMU Simulation
TMU Simulation.zip
USB4 Specification\USB4 ECN for Release
USB4 ECN through 20201015
USB4 1.0 ECN - 17 MTPs Vs Sub-MTP TUs.pdf
USB4 1.0 ECN - Adding Disable Time Sync Bit to TMU_ADP_CS_6 - V2.pdf
USB4 1.0 ECN - Adding Option for DP Wake.pdf
USB4 1.0 ECN - Adding Timeout for Sending LFPS on CLx Exit.pdf
USB4 1.0 ECN - Buffer Allocation Request Operation.pdf
USB4 1.0 ECN - Change Behavior of Router when Post Time is 0.pdf
USB4 1.0 ECN - Change in ISC and ISS Registers Address.pdf
USB4 1.0 ECN - Change Starting Phase after Sleep.pdf
USB4 1.0 ECN - CL0s Exit Timeout.pdf
USB4 1.0 ECN - Clarify AC Coupling Requirements.pdf
USB4 1.0 ECN - Clarify HW Margin Results.pdf
USB4 1.0 ECN - Default Value for Adapter State Register.pdf
USB4 1.0 ECN - DP Capability.pdf
USB4 1.0 ECN - DP Clock Sync Mini-mum Number of Fixes.pdf
USB4 1.0 ECN - Host Interface Receive Frame Mode Single Packet.pdf
USB4 1.0 ECN - Master Port May Stop Time Sync Handshake.pdf
USB4 1.0 ECN - Modify Common-Mode Return-Loss Mask of Captive Devices.pdf
USB4 1.0 ECN - Packet Forwarding Jitter.pdf
USB4 1.0 ECN - PCIe Logical Idle.pdf
USB4 1.0 ECN - Protocol Adapter Path CS Registers.pdf
USB4 1.0 ECN - Response to Control Adapter Access.pdf
USB4 1.0 ECN - Support for LTTPR Transparent.pdf
USB4 1.0 ECN - TBT3 Adapter CS.pdf
USB4 1.0 ECN - TBT3 CM Buffer Allocation.pdf
USB4 1.0 ECN - tTrainingAbort Action Change.pdf
USB4 1.0 ECN - Update TBT3 support of L1 and L2.pdf
USB4 1.0 ECN - Upstream Adapter RO.pdf
USB4 1.0 ECN - Wake on USB4 Depends on Enable Wake on USB4 Wake.pdf
USB4 Specification\USB4 ECN for Release\USB4 ECN through 20201015
USB4 1.0 ECN - Adding Condition to Deactivate RS-FEC Encoding.pdf
USB4 1.0 ECN - Alignment Error Event.pdf
USB4 1.0 ECN - Asymmetric RX Primary Flow Change.pdf
USB4 1.0 ECN - Asymmetric TxFFE Change.pdf
USB4 1.0 ECN - Bonding Error Scenario Addition.pdf
USB4 1.0 ECN - DP BW Allocation.pdf
USB4 1.0 ECN - DP FEC Jitter.pdf
USB4 1.0 ECN - DP Link Training Failure.pdf
USB4 1.0 ECN - DP Resource Allocation.pdf
USB4 1.0 ECN - DROM Base Address.pdf
USB4 1.0 ECN - Exit Sleep when UFP Disconnected.pdf
USB4 1.0 ECN - HI Memory Order.pdf
USB4 1.0 ECN - Host Router State Machine.pdf
USB4 1.0 ECN - Hot-Plug Notification Packet from DFP.pdf
USB4 1.0 ECN - Inter-Domain Time Sync is Optional for Host Routers.pdf
USB4 1.0 ECN - IRQ Delay During and After Link Training.pdf
USB4 1.0 ECN - Lane Disable Condition.pdf
USB4 1.0 ECN - Lock Bit Behavior When Disconnected.pdf
USB4 1.0 ECN - LT_LRoff on Downstream Facing Port.pdf
USB4 1.0 ECN - Port Operation Completion.pdf
USB4 1.0 ECN - Require DROM support for Discrete Host Routers.pdf
USB4 1.0 ECN - Router Detection Change.pdf
USB4 1.0 ECN - Router Ready Bit.pdf
USB4 1.0 ECN - Self Clear Bits.pdf
USB4 1.0 ECN - Sending TS2 After Bonding State.pdf
USB4 1.0 ECN - SET_TX_COMPLIANCE Requirement for Skew Between Lanes.pdf
USB4 1.0 ECN - SR Counter.pdf
USB4 1.0 ECN - Storing Credit and TMU Packets.pdf
USB4 1.0 ECN - Training Sub-State Transitions.pdf
USB4 1.0 ECN - TXFFE Preset14 Setting.pdf
USB4 1.0 ECN - UFP Sends Notification Packet for Logical Errors After Link Transitions to CL0.pdf
