SPRS956H March   2016  – November 2019 DRA722 , DRA724 , DRA725 , DRA726

PRODUCTION DATA.  

  1. 1 Device Overview
    1. 1.1 Features
    2. 1.2 Applications
    3. 1.3 Description
    4. 1.4 Functional Block Diagram
  2. 2 Revision History
  3. 3 Device Comparison
    1. 3.1 Related Products
  4. 4 Terminal Configuration and Functions
    1. 4.1 Terminal Assignment
      1. 4.1.1 Unused Balls Connection Requirements
    2. 4.2 Ball Characteristics
    3. 4.3 Multiplexing Characteristics
    4. 4.4 Signal Descriptions
      1. 4.4.1  Video Input Ports (VIP)
      2. 4.4.2  Display Subsystem – Video Output Ports
      3. 4.4.3  Display Subsystem – High-Definition Multimedia Interface (HDMI)
      4. 4.4.4  Camera Serial Interface 2 CAL bridge (CSI2)
      5. 4.4.5  External Memory Interface (EMIF)
      6. 4.4.6  General-Purpose Memory Controller (GPMC)
      7. 4.4.7  Timers
      8. 4.4.8  Inter-Integrated Circuit Interface (I2C)
      9. 4.4.9  HDQ / 1-Wire Interface (HDQ1W)
      10. 4.4.10 Universal Asynchronous Receiver Transmitter (UART)
      11. 4.4.11 Multichannel Serial Peripheral Interface (McSPI)
      12. 4.4.12 Quad Serial Peripheral Interface (QSPI)
      13. 4.4.13 Multicannel Audio Serial Port (McASP)
      14. 4.4.14 Universal Serial Bus (USB)
      15. 4.4.15 SATA
      16. 4.4.16 Peripheral Component Interconnect Express (PCIe)
      17. 4.4.17 Controller Area Network Interface (DCAN)
      18. 4.4.18 Ethernet Interface (GMAC_SW)
      19. 4.4.19 Media Local Bus (MLB) Interface
      20. 4.4.20 eMMC/SD/SDIO
      21. 4.4.21 General-Purpose Interface (GPIO)
      22. 4.4.22 Keyboard controller (KBD)
      23. 4.4.23 Pulse Width Modulation (PWM) Interface
      24. 4.4.24 Audio Tracking Logic (ATL)
      25. 4.4.25 Test Interfaces
      26. 4.4.26 System and Miscellaneous
        1. 4.4.26.1 Sysboot
        2. 4.4.26.2 Power, Reset, and Clock Management (PRCM)
        3. 4.4.26.3 Real-Time Clock (RTC) Interface
        4. 4.4.26.4 System Direct Memory Access (SDMA)
        5. 4.4.26.5 Interrupt Controllers (INTC)
        6. 4.4.26.6 Observability
      27. 4.4.27 Power Supplies
  5. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Power-On-Hour (POH) Limits
    4. 5.4  Recommended Operating Conditions
    5. 5.5  Operating Performance Points
      1. 5.5.1 AVS and ABB Requirements
      2. 5.5.2 Voltage And Core Clock Specifications
      3. 5.5.3 Maximum Supported Frequency
    6. 5.6  Power Consumption Summary
    7. 5.7  Electrical Characteristics
      1. 5.7.1  LVCMOS DDR DC Electrical Characteristics
      2. 5.7.2  HDMIPHY DC Electrical Characteristics
      3. 5.7.3  Dual Voltage LVCMOS I2C DC Electrical Characteristics
      4. 5.7.4  IQ1833 Buffers DC Electrical Characteristics
      5. 5.7.5  IHHV1833 Buffers DC Electrical Characteristics
      6. 5.7.6  LVCMOS OSC Buffers DC Electrical Characteristics
      7. 5.7.7  LVCMOS CSI2 DC Electrical Characteristics
      8. 5.7.8  BMLB18 Buffers DC Electrical Characteristics
      9. 5.7.9  BC1833IHHV Buffers DC Electrical Characteristics
      10. 5.7.10 USBPHY DC Electrical Characteristics
      11. 5.7.11 Dual Voltage SDIO1833 DC Electrical Characteristics
      12. 5.7.12 Dual Voltage LVCMOS DC Electrical Characteristics
      13. 5.7.13 SATAPHY DC Electrical Characteristics
      14. 5.7.14 PCIEPHY DC Electrical Characteristics
    8. 5.8  VPP Specifications for One-Time Programmable (OTP) eFuses
      1. Table 5-20 Recommended Operating Conditions for OTP eFuse Programming
      2. 5.8.1      Hardware Requirements
      3. 5.8.2      Programming Sequence
      4. 5.8.3      Impact to Your Hardware Warranty
    9. 5.9  Thermal Characteristics
      1. 5.9.1 Package Thermal Characteristics
    10. 5.10 Power Supply Sequences
  6. 6 Clock Specifications
    1. 6.1 Input Clock Specifications
      1. 6.1.1 Input Clock Requirements
      2. 6.1.2 System Oscillator OSC0 Input Clock
        1. 6.1.2.1 OSC0 External Crystal
        2. 6.1.2.2 OSC0 Input Clock
      3. 6.1.3 Auxiliary Oscillator OSC1 Input Clock
        1. 6.1.3.1 OSC1 External Crystal
        2. 6.1.3.2 OSC1 Input Clock
      4. 6.1.4 RTC Oscillator Input Clock
        1. 6.1.4.1 RTC Oscillator External Crystal
        2. 6.1.4.2 RTC Oscillator Input Clock
        3. 6.1.4.3 RC On-die Oscillator Clock
    2. 6.2 DPLLs, DLLs Specifications
      1. 6.2.1 DPLL Characteristics
      2. 6.2.2 DLL Characteristics
      3. 6.2.3 DPLL and DLL Noise Isolation
  7. 7 Timing Requirements and Switching Characteristics
    1. 7.1  Timing Test Conditions
    2. 7.2  Interface Clock Specifications
      1. 7.2.1 Interface Clock Terminology
      2. 7.2.2 Interface Clock Frequency
    3. 7.3  Timing Parameters and Information
      1. 7.3.1 Parameter Information
        1. 7.3.1.1 1.8V and 3.3V Signal Transition Levels
        2. 7.3.1.2 1.8V and 3.3V Signal Transition Rates
        3. 7.3.1.3 Timing Parameters and Board Routing Analysis
    4. 7.4  Recommended Clock and Control Signal Transition Behavior
    5. 7.5  Virtual and Manual I/O Timing Modes
    6. 7.6  Video Input Ports (VIP)
    7. 7.7  Display Subsystem - Video Output Ports
    8. 7.8  Display Subsystem - High-Definition Multimedia Interface (HDMI)
    9. 7.9  Camera Serial Interface 2 CAL bridge (CSI2)
      1. 7.9.1 CSI-2 MIPI D-PHY
    10. 7.10 External Memory Interface (EMIF)
    11. 7.11 General-Purpose Memory Controller (GPMC)
      1. 7.11.1 GPMC/NOR Flash Interface Synchronous Timing
      2. 7.11.2 GPMC/NOR Flash Interface Asynchronous Timing
      3. 7.11.3 GPMC/NAND Flash Interface Asynchronous Timing
    12. 7.12 Timers
    13. 7.13 Inter-Integrated Circuit Interface (I2C)
      1. Table 7-33 Timing Requirements for I2C Input Timings
      2. Table 7-34 Timing Requirements for I2C HS-Mode (I2C3/4/5/6 Only)
      3. Table 7-35 Switching Characteristics Over Recommended Operating Conditions for I2C Output Timings
    14. 7.14 HDQ / 1-Wire Interface (HDQ1W)
      1. 7.14.1 HDQ / 1-Wire - HDQ Mode
      2. 7.14.2 HDQ/1-Wire-1-Wire Mode
    15. 7.15 Universal Asynchronous Receiver Transmitter (UART)
      1. Table 7-40 Timing Requirements for UART
      2. Table 7-41 Switching Characteristics Over Recommended Operating Conditions for UART
    16. 7.16 Multichannel Serial Peripheral Interface (McSPI)
    17. 7.17 Quad Serial Peripheral Interface (QSPI)
    18. 7.18 Multichannel Audio Serial Port (McASP)
      1. Table 7-48 Timing Requirements for McASP1
      2. Table 7-49 Timing Requirements for McASP2
      3. Table 7-50 Timing Requirements for McASP3/4/5/6/7/8
    19. 7.19 Universal Serial Bus (USB)
      1. 7.19.1 USB1 DRD PHY
      2. 7.19.2 USB2 PHY
      3. 7.19.3 USB3 DRD ULPI-SDR-Slave Mode-12-pin Mode
    20. 7.20 Serial Advanced Technology Attachment (SATA)
    21. 7.21 Peripheral Component Interconnect Express (PCIe)
    22. 7.22 Controller Area Network Interface (DCAN)
      1. Table 7-68 Timing Requirements for DCANx Receive
      2. Table 7-69 Switching Characteristics Over Recommended Operating Conditions for DCANx Transmit
    23. 7.23 Ethernet Interface (GMAC_SW)
      1. 7.23.1 GMAC MII Timings
        1. Table 7-70 Timing Requirements for miin_rxclk - MII Operation
        2. Table 7-71 Timing Requirements for miin_txclk - MII Operation
        3. Table 7-72 Timing Requirements for GMAC MIIn Receive 10/100 Mbit/s
        4. Table 7-73 Switching Characteristics Over Recommended Operating Conditions for GMAC MIIn Transmit 10/100 Mbits/s
      2. 7.23.2 GMAC MDIO Interface Timings
      3. 7.23.3 GMAC RMII Timings
        1. Table 7-78 Timing Requirements for GMAC REF_CLK - RMII Operation
        2. Table 7-79 Timing Requirements for GMAC RMIIn Receive
        3. Table 7-80 Switching Characteristics Over Recommended Operating Conditions for GMAC REF_CLK - RMII Operation
        4. Table 7-81 Switching Characteristics Over Recommended Operating Conditions for GMAC RMIIn Transmit 10/100 Mbits/s
      4. 7.23.4 GMAC RGMII Timings
        1. Table 7-85 Timing Requirements for rgmiin_rxc - RGMIIn Operation
        2. Table 7-86 Timing Requirements for GMAC RGMIIn Input Receive for 10/100/1000 Mbps
        3. Table 7-87 Switching Characteristics Over Recommended Operating Conditions for rgmiin_txctl - RGMIIn Operation for 10/100/1000 Mbit/s
        4. Table 7-88 Switching Characteristics for GMAC RGMIIn Output Transmit for 10/100/1000 Mbps
    24. 7.24 Media Local Bus (MLB) interface
    25. 7.25 eMMC/SD/SDIO
      1. 7.25.1 MMC1-SD Card Interface
        1. 7.25.1.1 Default speed, 4-bit data, SDR, half-cycle
        2. 7.25.1.2 High speed, 4-bit data, SDR, half-cycle
        3. 7.25.1.3 SDR12, 4-bit data, half-cycle
        4. 7.25.1.4 SDR25, 4-bit data, half-cycle
        5. 7.25.1.5 UHS-I SDR50, 4-bit data, half-cycle
        6. 7.25.1.6 UHS-I SDR104, 4-bit data, half-cycle
        7. 7.25.1.7 UHS-I DDR50, 4-bit data
      2. 7.25.2 MMC2 - eMMC
        1. 7.25.2.1 Standard JC64 SDR, 8-bit data, half cycle
        2. 7.25.2.2 High Speed JC64 SDR, 8-bit data, half cycle
        3. 7.25.2.3 High Speed HS200 JEDS84 SDR, 8-bit data, half cycle
        4. 7.25.2.4 High Speed JC64 DDR, 8-bit data
          1. Table 7-119 Switching Characteristics for MMC2 - JC64 High Speed DDR Mode
      3. 7.25.3 MMC3 and MMC4-SDIO/SD
        1. 7.25.3.1 MMC3 and MMC4, SD Default Speed
        2. 7.25.3.2 MMC3 and MMC4, SD High Speed
        3. 7.25.3.3 MMC3 and MMC4, SD and SDIO SDR12 Mode
        4. 7.25.3.4 MMC3 and MMC4, SD SDR25 Mode
        5. 7.25.3.5 MMC3 SDIO High Speed UHS-I SDR50 Mode, Half Cycle
    26. 7.26 General-Purpose Interface (GPIO)
    27. 7.27 Audio Tracking Logic (ATL)
      1. 7.27.1 ATL Electrical Data/Timing
        1. Table 7-141 Switching Characteristics Over Recommended Operating Conditions for ATL_CLKOUTx
    28. 7.28 System and Miscellaneous interfaces
    29. 7.29 Test Interfaces
      1. 7.29.1 IEEE 1149.1 Standard-Test-Access Port (JTAG)
        1. 7.29.1.1 JTAG Electrical Data/Timing
          1. Table 7-142 Timing Requirements for IEEE 1149.1 JTAG
          2. Table 7-143 Switching Characteristics Over Recommended Operating Conditions for IEEE 1149.1 JTAG
          3. Table 7-144 Timing Requirements for IEEE 1149.1 JTAG With RTCK
          4. Table 7-145 Switching Characteristics Over Recommended Operating Conditions for IEEE 1149.1 JTAG With RTCK
      2. 7.29.2 Trace Port Interface Unit (TPIU)
        1. 7.29.2.1 TPIU PLL DDR Mode
  8. 8 Applications, Implementation, and Layout
    1. 8.1 Introduction
      1. 8.1.1 Initial Requirements and Guidelines
    2. 8.2 Power Optimizations
      1. 8.2.1 Step 1: PCB Stack-up
      2. 8.2.2 Step 2: Physical Placement
      3. 8.2.3 Step 3: Static Analysis
        1. 8.2.3.1 PDN Resistance and IR Drop
      4. 8.2.4 Step 4: Frequency Analysis
      5. 8.2.5 System ESD Generic Guidelines
        1. 8.2.5.1 System ESD Generic PCB Guideline
        2. 8.2.5.2 Miscellaneous EMC Guidelines to Mitigate ESD Immunity
        3. 8.2.5.3 ESD Protection System Design Consideration
      6. 8.2.6 EMI / EMC Issues Prevention
        1. 8.2.6.1 Signal Bandwidth
        2. 8.2.6.2 Signal Routing
          1. 8.2.6.2.1 Signal Routing—Sensitive Signals and Shielding
          2. 8.2.6.2.2 Signal Routing—Outer Layer Routing
        3. 8.2.6.3 Ground Guidelines
          1. 8.2.6.3.1 PCB Outer Layers
          2. 8.2.6.3.2 Metallic Frames
          3. 8.2.6.3.3 Connectors
          4. 8.2.6.3.4 Guard Ring on PCB Edges
          5. 8.2.6.3.5 Analog and Digital Ground
    3. 8.3 Core Power Domains
      1. 8.3.1 General Constraints and Theory
      2. 8.3.2 Voltage Decoupling
      3. 8.3.3 Static PDN Analysis
      4. 8.3.4 Dynamic PDN Analysis
      5. 8.3.5 Power Supply Mapping
      6. 8.3.6 DPLL Voltage Requirement
      7. 8.3.7 Loss of Input Power Event
      8. 8.3.8 Example PCB Design
        1. 8.3.8.1 Example Stack-up
        2. 8.3.8.2 vdd Example Analysis
    4. 8.4 Single-Ended Interfaces
      1. 8.4.1 General Routing Guidelines
      2. 8.4.2 QSPI Board Design and Layout Guidelines
    5. 8.5 Differential Interfaces
      1. 8.5.1 General Routing Guidelines
      2. 8.5.2 USB 2.0 Board Design and Layout Guidelines
        1. 8.5.2.1 Background
        2. 8.5.2.2 USB PHY Layout Guide
          1. 8.5.2.2.1 General Routing and Placement
          2. 8.5.2.2.2 Specific Guidelines for USB PHY Layout
            1. 8.5.2.2.2.1  Analog, PLL, and Digital Power Supply Filtering
            2. 8.5.2.2.2.2  Analog, Digital, and PLL Partitioning
            3. 8.5.2.2.2.3  Board Stackup
            4. 8.5.2.2.2.4  Cable Connector Socket
            5. 8.5.2.2.2.5  Clock Routings
            6. 8.5.2.2.2.6  Crystals/Oscillator
            7. 8.5.2.2.2.7  DP/DM Trace
            8. 8.5.2.2.2.8  DP/DM Vias
            9. 8.5.2.2.2.9  Image Planes
            10. 8.5.2.2.2.10 Power Regulators
        3. 8.5.2.3 References
      3. 8.5.3 USB 3.0 Board Design and Layout Guidelines
        1. 8.5.3.1 USB 3.0 interface introduction
        2. 8.5.3.2 USB 3.0 General routing rules
      4. 8.5.4 HDMI Board Design and Layout Guidelines
        1. 8.5.4.1 HDMI Interface Schematic
        2. 8.5.4.2 TMDS General Routing Guidelines
        3. 8.5.4.3 TPD5S115
        4. 8.5.4.4 HDMI ESD Protection Device (Required)
        5. 8.5.4.5 PCB Stackup Specifications
        6. 8.5.4.6 Grounding
      5. 8.5.5 SATA Board Design and Layout Guidelines
        1. 8.5.5.1 SATA Interface Schematic
        2. 8.5.5.2 Compatible SATA Components and Modes
        3. 8.5.5.3 PCB Stackup Specifications
        4. 8.5.5.4 Routing Specifications
      6. 8.5.6 PCIe Board Design and Layout Guidelines
        1. 8.5.6.1 PCIe Connections and Interface Compliance
          1. 8.5.6.1.1 Coupling Capacitors
          2. 8.5.6.1.2 Polarity Inversion
        2. 8.5.6.2 Non-standard PCIe connections
          1. 8.5.6.2.1 PCB Stackup Specifications
          2. 8.5.6.2.2 Routing Specifications
            1. 8.5.6.2.2.1 Impedance
            2. 8.5.6.2.2.2 Differential Coupling
            3. 8.5.6.2.2.3 Pair Length Matching
        3. 8.5.6.3 LJCB_REFN/P Connections
      7. 8.5.7 CSI2 Board Design and Routing Guidelines
        1. 8.5.7.1 CSI2_0 and CSI2_1 MIPI CSI-2 (1.5 Gbps)
          1. 8.5.7.1.1 General Guidelines
          2. 8.5.7.1.2 Length Mismatch Guidelines
            1. 8.5.7.1.2.1 CSI2_0 and CSI2_1 MIPI CSI-2 (1.5 Gbps)
          3. 8.5.7.1.3 Frequency-domain Specification Guidelines
    6. 8.6 Clock Routing Guidelines
      1. 8.6.1 32-kHz Oscillator Routing
      2. 8.6.2 Oscillator Ground Connection
    7. 8.7 DDR3 Board Design and Layout Guidelines
      1. 8.7.1 DDR3 General Board Layout Guidelines
      2. 8.7.2 DDR3 Board Design and Layout Guidelines
        1. 8.7.2.1  Board Designs
        2. 8.7.2.2  DDR3 EMIF
        3. 8.7.2.3  DDR3 Device Combinations
        4. 8.7.2.4  DDR3 Interface Schematic
          1. 8.7.2.4.1 32-Bit DDR3 Interface
          2. 8.7.2.4.2 16-Bit DDR3 Interface
        5. 8.7.2.5  Compatible JEDEC DDR3 Devices
        6. 8.7.2.6  PCB Stackup
        7. 8.7.2.7  Placement
        8. 8.7.2.8  DDR3 Keepout Region
        9. 8.7.2.9  Bulk Bypass Capacitors
        10. 8.7.2.10 High Speed Bypass Capacitors
          1. 8.7.2.10.1 Return Current Bypass Capacitors
        11. 8.7.2.11 Net Classes
        12. 8.7.2.12 DDR3 Signal Termination
        13. 8.7.2.13 VREF_DDR Routing
        14. 8.7.2.14 VTT
        15. 8.7.2.15 CK and ADDR_CTRL Topologies and Routing Definition
          1. 8.7.2.15.1 Four DDR3 Devices
            1. 8.7.2.15.1.1 CK and ADDR_CTRL Topologies, Four DDR3 Devices
            2. 8.7.2.15.1.2 CK and ADDR_CTRL Routing, Four DDR3 Devices
          2. 8.7.2.15.2 Two DDR3 Devices
            1. 8.7.2.15.2.1 CK and ADDR_CTRL Topologies, Two DDR3 Devices
            2. 8.7.2.15.2.2 CK and ADDR_CTRL Routing, Two DDR3 Devices
          3. 8.7.2.15.3 One DDR3 Device
            1. 8.7.2.15.3.1 CK and ADDR_CTRL Topologies, One DDR3 Device
            2. 8.7.2.15.3.2 CK and ADDR/CTRL Routing, One DDR3 Device
        16. 8.7.2.16 Data Topologies and Routing Definition
          1. 8.7.2.16.1 DQS and DQ/DM Topologies, Any Number of Allowed DDR3 Devices
          2. 8.7.2.16.2 DQS and DQ/DM Routing, Any Number of Allowed DDR3 Devices
        17. 8.7.2.17 Routing Specification
          1. 8.7.2.17.1 CK and ADDR_CTRL Routing Specification
          2. 8.7.2.17.2 DQS and DQ Routing Specification
  9. 9 Device and Documentation Support
    1. 9.1 Device Nomenclature
      1. 9.1.1 Standard Package Symbolization
      2. 9.1.2 Device Naming Convention
    2. 9.2 Tools and Software
    3. 9.3 Documentation Support
    4. 9.4 Related Links
    5. 9.5 Support Resources
    6. 9.6 Trademarks
    7. 9.7 Electrostatic Discharge Caution
    8. 9.8 Glossary
  10. 10Mechanical, Packaging, and Orderable Information
    1. 10.1 Packaging Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • ABC|760
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.5.3.2 USB 3.0 General routing rules

Some general routing guidelines regarding USB 3.0:

  • Avoid crossing splits reference plane(s).
  • Shorter trace length is preferred.
  • Minimize the via usage and layer transition
  • Keep large spacing between TX and RX pairs.
  • Intra-lane delay mismatch between DP and DM less than 1ps. Same for RXp and RXn.
  • Distance between common mode filter (CMF) and ESD protection device should be as short as possible
  • Distance between ESD protection device and USB connector should be as short as possible.
  • Distance between AC capacitors (TX only) and CMF should be as short as possible.
  • USB 3.0 signals should always be routed over an adjacent ground plane.

Table 8-10 and Table 8-11 present routing specification and recommendations for USB1 in the device.

Table 8-10 USB1 Routing Specifications

PARAMETER MIN TYP MAX UNIT
Device balls to USB 3.0 connector trace length 3500 Mils
Skew within a differential pair 3 6 Mils
Number of stubs allowed on TX/RX traces 0 Stubs
TX/RX pair differential impedance 83.7 90 96.3 Ω
Number of vias on each TX/RX trace(1) 2 Vias
Differential pair to any other trace spacing (2)(3)(4) 2xDS 3xDS
Number of ground plane cuts allowed within USB3 routing region (except for specific ground carving as explained in this document) 0 Cuts
Number of layers between USB3.0 routing region and reference ground plane 0 Layers
PCB trace width 6 Mils
PCB BGA escape via pad size 18 Mils
PCB BGA escape via hole size 10 Mils
  1. Vias must be used in pairs and spaced equally along a signal path.
  2. DS = differential spacing of the traces.
  3. Exceptions may be necessary in the SoC package BGA area.
  4. GND guard-bands on the same layer may be closer, but should not be allowed to affect the impedance of the differential pair routing. GND guard-bands to isolate USB3.0 differential pairs from all other signals are recommended.

Table 8-11 USB1 Routing Recommendations

Item Description Reason
ESD location Place ESD component on same layer as connector (no via or stub to ESD component) Eliminate reflection loss from via & stub to ESD
ESD part number TPD1E05U06 Minimize capacitance (0.42pF)
CMF part number DLW21SN900HQ2 Manufacturer’s recommended device
Connector Use USB3.0 connector with supporting s-parameter model Enable full signal chain simulation
Carve Ground Carve GND underneath AC Caps, ESD, CMF, and connector Minimize capacitance under ESD and CMF
Round pads Minimize pad size and round the corners of the pads for the ESD and CMF components Minimize capacitance
Vias Max 2 vias per signal trace. If vias are required, place vias close to the AC Caps and CMFs. Vias under the SoC grid array may be used if necessary to route signals away from BGA pattern. Vias significantly degrade signal integrity at 2.5GHz

Figure 8-32 presents an example layout, demonstrating the “carve GND” concept.

DRA722 DRA724 DRA725 DRA726 SPRS85x_PCB_USB30_3.gifFigure 8-32 USB 3.0 Example “carve GND” layout