SPRS982H December   2016  – December 2019 AM5746 , AM5748 , AM5749

PRODUCTION DATA.  

  1. 1Device Overview
    1. 1.1 Features
    2. 1.2 Applications
    3. 1.3 Description
    4. 1.4 Functional Block Diagram
  2. 2Revision History
  3. 3Device Comparison
    1. 3.1 Related Products
  4. 4Terminal Configuration and Functions
    1. 4.1 Pin Diagram
    2. 4.2 Pin Attributes
    3. 4.3 Signal Descriptions
      1. 4.3.1  VIP
      2. 4.3.2  DSS
      3. 4.3.3  HDMI
      4. 4.3.4  EMIF
      5. 4.3.5  GPMC
      6. 4.3.6  Timer
      7. 4.3.7  I2C
      8. 4.3.8  HDQ1W
      9. 4.3.9  UART
      10. 4.3.10 McSPI
      11. 4.3.11 QSPI
      12. 4.3.12 McASP
      13. 4.3.13 USB
      14. 4.3.14 SATA
      15. 4.3.15 PCIe
      16. 4.3.16 DCAN and MCAN
      17. 4.3.17 GMAC_SW
      18. 4.3.18 MLB
      19. 4.3.19 eMMC/SD/SDIO
      20. 4.3.20 GPIO
      21. 4.3.21 KBD
      22. 4.3.22 PWM
      23. 4.3.23 PRU-ICSS
      24. 4.3.24 Test Interfaces
      25. 4.3.25 System and Miscellaneous
        1. 4.3.25.1 Sysboot
        2. 4.3.25.2 PRCM
        3. 4.3.25.3 RTCSS
        4. 4.3.25.4 SDMA
        5. 4.3.25.5 INTC
        6. 4.3.25.6 Observability
        7. 4.3.25.7 Power Supplies
    4. 4.4 Pin Multiplexing
    5. 4.5 Connections for Unused Pins
  5. 5Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Power-On Hours (POH) Limits
      1. Table 5-1 Power-On Hours (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. Table 5-7  LVCMOS DDR DC Electrical Characteristics
      2. Table 5-8  Dual Voltage LVCMOS I2C DC Electrical Characteristics
      3. Table 5-9  IQ1833 Buffers DC Electrical Characteristics
      4. Table 5-10 IHHV1833 Buffers DC Electrical Characteristics
      5. Table 5-11 LVCMOS OSC Buffers DC Electrical Characteristics
      6. Table 5-12 BC1833IHHV Buffers DC Electrical Characteristics
      7. Table 5-13 Dual Voltage SDIO1833 DC Electrical Characteristics
      8. Table 5-14 Dual Voltage LVCMOS DC Electrical Characteristics
      9. 5.7.1      HDMIPHY DC Electrical Characteristics
      10. 5.7.2      USBPHY DC Electrical Characteristics
      11. 5.7.3      SATAPHY DC Electrical Characteristics
      12. 5.7.4      PCIEPHY DC Electrical Characteristics
    8. 5.8  VPP Specifications for One-Time Programmable (OTP) eFuses
      1. Table 5-15 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 Timing Requirements and Switching Characteristics
      1. 5.10.1 Timing Parameters and Information
        1. 5.10.1.1 Parameter Information
          1. 5.10.1.1.1 1.8V and 3.3V Signal Transition Levels
          2. 5.10.1.1.2 1.8V and 3.3V Signal Transition Rates
          3. 5.10.1.1.3 Timing Parameters and Board Routing Analysis
      2. 5.10.2 Interface Clock Specifications
        1. 5.10.2.1 Interface Clock Terminology
        2. 5.10.2.2 Interface Clock Frequency
      3. 5.10.3 Power Supply Sequences
      4. 5.10.4 Clock Specifications
        1. 5.10.4.1 Input Clocks / Oscillators
          1. 5.10.4.1.1 OSC0 External Crystal
          2. 5.10.4.1.2 OSC0 Input Clock
          3. 5.10.4.1.3 Auxiliary Oscillator OSC1 Input Clock
            1. 5.10.4.1.3.1 OSC1 External Crystal
            2. 5.10.4.1.3.2 OSC1 Input Clock
          4. 5.10.4.1.4 RTC Oscillator Input Clock
            1. 5.10.4.1.4.1 RTC Oscillator External Crystal
            2. 5.10.4.1.4.2 RTC Oscillator Input Clock
        2. 5.10.4.2 RC On-die Oscillator Clock
        3. 5.10.4.3 Output Clocks
        4. 5.10.4.4 DPLLs, DLLs
          1. 5.10.4.4.1 DPLL Characteristics
          2. 5.10.4.4.2 DLL Characteristics
      5. 5.10.5 Recommended Clock and Control Signal Transition Behavior
      6. 5.10.6 Peripherals
        1. 5.10.6.1  Timing Test Conditions
        2. 5.10.6.2  Virtual and Manual I/O Timing Modes
        3. 5.10.6.3  VIP
        4. 5.10.6.4  DSS
        5. 5.10.6.5  HDMI
        6. 5.10.6.6  EMIF
        7. 5.10.6.7  GPMC
          1. 5.10.6.7.1 GPMC/NOR Flash Interface Synchronous Timing
          2. 5.10.6.7.2 GPMC/NOR Flash Interface Asynchronous Timing
          3. 5.10.6.7.3 GPMC/NAND Flash Interface Asynchronous Timing
        8. 5.10.6.8  I2C
          1. Table 5-65 Timing Requirements for I2C Input Timings
          2. Table 5-66 Timing Requirements for I2C HS-Mode (I2C3/4/5 Only)
          3. Table 5-67 Switching Characteristics Over Recommended Operating Conditions for I2C Output Timings
        9. 5.10.6.9  HDQ1W
          1. 5.10.6.9.1 HDQ / 1-Wire — HDQ Mode
          2. 5.10.6.9.2 HDQ/1-Wire—1-Wire Mode
        10. 5.10.6.10 UART
          1. Table 5-72 Timing Requirements for UART
          2. Table 5-73 Switching Characteristics Over Recommended Operating Conditions for UART
        11. 5.10.6.11 McSPI
        12. 5.10.6.12 QSPI
        13. 5.10.6.13 McASP
          1. Table 5-80 Timing Requirements for McASP1
          2. Table 5-81 Timing Requirements for McASP2
          3. Table 5-82 Timing Requirements for McASP3/4/5/6/7/8
          4. Table 5-83 Switching Characteristics Over Recommended Operating Conditions for McASP1
          5. Table 5-84 Switching Characteristics Over Recommended Operating Conditions for McASP2
          6. Table 5-85 Switching Characteristics Over Recommended Operating Conditions for McASP3/4/5/6/7/8
        14. 5.10.6.14 USB
          1. 5.10.6.14.1 USB1 DRD PHY
          2. 5.10.6.14.2 USB2 PHY
        15. 5.10.6.15 SATA
        16. 5.10.6.16 PCIe
        17. 5.10.6.17 CAN
          1. 5.10.6.17.1 DCAN
          2. 5.10.6.17.2 MCAN-FD
          3. Table 5-97  Timing Requirements for CANx Receive
          4. Table 5-98  Switching Characteristics Over Recommended Operating Conditions for CANx Transmit
        18. 5.10.6.18 GMAC_SW
          1. 5.10.6.18.1 GMAC MII Timings
            1. Table 5-99  Timing Requirements for miin_rxclk - MII Operation
            2. Table 5-100 Timing Requirements for miin_txclk - MII Operation
            3. Table 5-101 Timing Requirements for GMAC MIIn Receive 10/100 Mbit/s
            4. Table 5-102 Switching Characteristics Over Recommended Operating Conditions for GMAC MIIn Transmit 10/100 Mbits/s
          2. 5.10.6.18.2 GMAC MDIO Interface Timings
          3. 5.10.6.18.3 GMAC RMII Timings
            1. Table 5-107 Timing Requirements for GMAC REF_CLK - RMII Operation
            2. Table 5-108 Timing Requirements for GMAC RMIIn Receive
            3. Table 5-109 Switching Characteristics Over Recommended Operating Conditions for GMAC REF_CLK - RMII Operation
            4. Table 5-110 Switching Characteristics Over Recommended Operating Conditions for GMAC RMIIn Transmit 10/100 Mbits/s
          4. 5.10.6.18.4 GMAC RGMII Timings
            1. Table 5-114 Timing Requirements for rgmiin_rxc - RGMIIn Operation
            2. Table 5-115 Timing Requirements for GMAC RGMIIn Input Receive for 10/100/1000 Mbps
            3. Table 5-116 Switching Characteristics Over Recommended Operating Conditions for rgmiin_txctl - RGMIIn Operation for 10/100/1000 Mbit/s
            4. Table 5-117 Switching Characteristics for GMAC RGMIIn Output Transmit for 10/100/1000 Mbps
        19. 5.10.6.19 eMMC/SD/SDIO
          1. 5.10.6.19.1 MMC1—SD Card Interface
            1. 5.10.6.19.1.1 Default speed, 4-bit data, SDR, half-cycle
            2. 5.10.6.19.1.2 High speed, 4-bit data, SDR, half-cycle
            3. 5.10.6.19.1.3 SDR12, 4-bit data, half-cycle
            4. 5.10.6.19.1.4 SDR25, 4-bit data, half-cycle
            5. 5.10.6.19.1.5 UHS-I SDR50, 4-bit data, half-cycle
            6. 5.10.6.19.1.6 UHS-I SDR104, 4-bit data, half-cycle
            7. 5.10.6.19.1.7 UHS-I DDR50, 4-bit data
          2. 5.10.6.19.2 MMC2 — eMMC
            1. 5.10.6.19.2.1 Standard JC64 SDR, 8-bit data, half cycle
            2. 5.10.6.19.2.2 High Speed JC64 SDR, 8-bit data, half cycle
            3. 5.10.6.19.2.3 High Speed HS200 JC64 SDR, 8-bit data, half cycle
            4. 5.10.6.19.2.4 High Speed JC64 DDR, 8-bit data
          3. 5.10.6.19.3 MMC3 and MMC4—SDIO/SD
            1. 5.10.6.19.3.1 MMC3 and MMC4, SD Default Speed
            2. 5.10.6.19.3.2 MMC3 and MMC4, SD High Speed
            3. 5.10.6.19.3.3 MMC3 and MMC4, SD and SDIO SDR12 Mode
            4. 5.10.6.19.3.4 MMC3 and MMC4, SD SDR25 Mode
            5. 5.10.6.19.3.5 MMC3 SDIO High Speed UHS-I SDR50 Mode, Half Cycle
        20. 5.10.6.20 PRU-ICSS
          1. 5.10.6.20.1 Programmable Real-Time Unit (PRU-ICSS PRU)
            1. 5.10.6.20.1.1 PRU-ICSS PRU Direct Input/Output Mode Electrical Data and Timing
              1. Table 5-166 PRU-ICSS PRU Timing Requirements - Direct Input Mode
              2. Table 5-167 PRU-ICSS PRU Switching Requirements – Direct Output Mode
            2. 5.10.6.20.1.2 PRU-ICSS PRU Parallel Capture Mode Electrical Data and Timing
              1. Table 5-168 PRU-ICSS PRU Timing Requirements - Parallel Capture Mode
            3. 5.10.6.20.1.3 PRU-ICSS PRU Shift Mode Electrical Data and Timing
              1. Table 5-169 PRU-ICSS PRU Timing Requirements – Shift In Mode
              2. Table 5-170 PRU-ICSS PRU Switching Requirements - Shift Out Mode
            4. 5.10.6.20.1.4 PRU-ICSS PRU Sigma Delta and EnDAT Modes
              1. Table 5-171 PRU-ICSS PRU Timing Requirements - Sigma Delta Mode
              2. Table 5-172 PRU-ICSS PRU Timing Requirements - EnDAT Mode
              3. Table 5-173 PRU-ICSS PRU Switching Requirements - EnDAT Mode
          2. 5.10.6.20.2 PRU-ICSS EtherCAT (PRU-ICSS ECAT)
            1. 5.10.6.20.2.1 PRU-ICSS ECAT Electrical Data and Timing
              1. Table 5-174 PRU-ICSS ECAT Timing Requirements – Input Validated With LATCH_IN
              2. Table 5-175 PRU-ICSS ECAT Timing Requirements – Input Validated With SYNCx
              3. Table 5-176 PRU-ICSS ECAT Timing Requirements – Input Validated With Start of Frame (SOF)
              4. Table 5-177 PRU-ICSS ECAT Timing Requirements - LATCHx_IN
              5. Table 5-178 PRU-ICSS ECAT Switching Requirements - Digital IOs
          3. 5.10.6.20.3 PRU-ICSS MII_RT and Switch
            1. 5.10.6.20.3.1 PRU-ICSS MDIO Electrical Data and Timing
              1. Table 5-179 PRU-ICSS MDIO Timing Requirements – MDIO_DATA
              2. Table 5-180 PRU-ICSS MDIO Switching Characteristics - MDIO_CLK
              3. Table 5-181 PRU-ICSS MDIO Switching Characteristics – MDIO_DATA
            2. 5.10.6.20.3.2 PRU-ICSS MII_RT Electrical Data and Timing
              1. Table 5-182 PRU-ICSS MII_RT Timing Requirements – MII[x]_RXCLK
              2. Table 5-183 PRU-ICSS MII_RT Timing Requirements - MII[x]_TXCLK
              3. Table 5-184 PRU-ICSS MII_RT Timing Requirements - MII_RXD[3:0], MII_RXDV, and MII_RXER
              4. Table 5-185 PRU-ICSS MII_RT Switching Characteristics - MII_TXD[3:0] and MII_TXEN
          4. 5.10.6.20.4 PRU-ICSS Universal Asynchronous Receiver Transmitter (PRU-ICSS UART)
            1. Table 5-186 Timing Requirements for PRU-ICSS UART Receive
            2. Table 5-187 Switching Characteristics Over Recommended Operating Conditions for PRU-ICSS UART Transmit
          5. 5.10.6.20.5 PRU-ICSS IOSETs
          6. 5.10.6.20.6 PRU-ICSS Manual Functional Mapping
        21. 5.10.6.21 System and Miscellaneous interfaces
      7. 5.10.7 Emulation and Debug Subsystem
        1. 5.10.7.1 JTAG
          1. 5.10.7.1.1 JTAG Electrical Data/Timing
            1. Table 5-210 Timing Requirements for IEEE 1149.1 JTAG
            2. Table 5-211 Switching Characteristics Over Recommended Operating Conditions for IEEE 1149.1 JTAG
            3. Table 5-212 Timing Requirements for IEEE 1149.1 JTAG With RTCK
            4. Table 5-213 Switching Characteristics Over Recommended Operating Conditions for IEEE 1149.1 JTAG With RTCK
        2. 5.10.7.2 TPIU
          1. 5.10.7.2.1 TPIU PLL DDR Mode
  6. 6Detailed Description
    1. 6.1 Overview
    2. 6.2 Processor Subsystems
      1. 6.2.1 MPU
      2. 6.2.2 DSP Subsystem
      3. 6.2.3 IPU
      4. 6.2.4 Interrupt Controller
      5. 6.2.5 VPE
    3. 6.3 Accelerators and Coprocessors
      1. 6.3.1 IVA
      2. 6.3.2 GPU
      3. 6.3.3 PRU-ICSS
      4. 6.3.4 EVE
    4. 6.4 Other Subsystems
      1. 6.4.1 Memory Subsystem
        1. 6.4.1.1 EMIF
        2. 6.4.1.2 GPMC
        3. 6.4.1.3 ELM
        4. 6.4.1.4 OCMC
        5. 6.4.1.5 Interprocessor Communication
          1. 6.4.1.5.1 Mailbox
          2. 6.4.1.5.2 Spinlock
      2. 6.4.2 EDMA
      3. 6.4.3 Peripherals
        1. 6.4.3.1  VIP
        2. 6.4.3.2  DSS
        3. 6.4.3.3  Timers
        4. 6.4.3.4  I2C
        5. 6.4.3.5  HDQ1W
        6. 6.4.3.6  UART
          1. 6.4.3.6.1 UART Features
          2. 6.4.3.6.2 IrDA Features
          3. 6.4.3.6.3 CIR Features
        7. 6.4.3.7  McSPI
        8. 6.4.3.8  QSPI
        9. 6.4.3.9  McASP
        10. 6.4.3.10 USB
        11. 6.4.3.11 SATA
        12. 6.4.3.12 PCIe
        13. 6.4.3.13 CAN
          1. 6.4.3.13.1 DCAN
          2. 6.4.3.13.2 MCAN-FD
        14. 6.4.3.14 GMAC_SW
        15. 6.4.3.15 eMMC/SD/SDIO
        16. 6.4.3.16 GPIO
        17. 6.4.3.17 ePWM
        18. 6.4.3.18 eCAP
        19. 6.4.3.19 eQEP
      4. 6.4.4 On-Chip Debug
    5. 6.5 Identification
      1. 6.5.1 Revision Identification
      2. 6.5.2 Die Identification
      3. 6.5.3 JTAG Identification
      4. 6.5.4 ROM Code Identification
    6. 6.6 Boot Modes
      1. 6.6.1 Boot Mode List
      2. 6.6.2 Boot Mode Pin Usage
        1. 6.6.2.1 GPMC Configuration for XIP/NAND
        2. 6.6.2.2 System Clock Speed Selection
        3. 6.6.2.3 QSPI Redundant SBL Images Offset
      3. 6.6.3 Boot Mode Selection
        1. 6.6.3.1 Booting Device Order Selection
  7. 7Applications, Implementation, and Layout
    1. 7.1 Power Supply Mapping
    2. 7.2 DDR3 Board Design and Layout Guidelines
      1. 7.2.1 DDR3 General Board Layout Guidelines
      2. 7.2.2 DDR3 Board Design and Layout Guidelines
        1. 7.2.2.1  Board Designs
        2. 7.2.2.2  DDR3 EMIFs
        3. 7.2.2.3  DDR3 Device Combinations
        4. 7.2.2.4  DDR3 Interface Schematic
          1. 7.2.2.4.1 32-Bit DDR3 Interface
          2. 7.2.2.4.2 16-Bit DDR3 Interface
        5. 7.2.2.5  Compatible JEDEC DDR3 Devices
        6. 7.2.2.6  PCB Stackup
        7. 7.2.2.7  Placement
        8. 7.2.2.8  DDR3 Keepout Region
        9. 7.2.2.9  Bulk Bypass Capacitors
        10. 7.2.2.10 High Speed Bypass Capacitors
          1. 7.2.2.10.1 Return Current Bypass Capacitors
        11. 7.2.2.11 Net Classes
        12. 7.2.2.12 DDR3 Signal Termination
        13. 7.2.2.13 VREF_DDR Routing
        14. 7.2.2.14 VTT
        15. 7.2.2.15 CK and ADDR_CTRL Topologies and Routing Definition
          1. 7.2.2.15.1 Four DDR3 Devices
            1. 7.2.2.15.1.1 CK and ADDR_CTRL Topologies, Four DDR3 Devices
            2. 7.2.2.15.1.2 CK and ADDR_CTRL Routing, Four DDR3 Devices
          2. 7.2.2.15.2 Two DDR3 Devices
            1. 7.2.2.15.2.1 CK and ADDR_CTRL Topologies, Two DDR3 Devices
            2. 7.2.2.15.2.2 CK and ADDR_CTRL Routing, Two DDR3 Devices
          3. 7.2.2.15.3 One DDR3 Device
            1. 7.2.2.15.3.1 CK and ADDR_CTRL Topologies, One DDR3 Device
            2. 7.2.2.15.3.2 CK and ADDR/CTRL Routing, One DDR3 Device
        16. 7.2.2.16 Data Topologies and Routing Definition
          1. 7.2.2.16.1 DQS and DQ/DM Topologies, Any Number of Allowed DDR3 Devices
          2. 7.2.2.16.2 DQS and DQ/DM Routing, Any Number of Allowed DDR3 Devices
        17. 7.2.2.17 Routing Specification
          1. 7.2.2.17.1 CK and ADDR_CTRL Routing Specification
          2. 7.2.2.17.2 DQS and DQ Routing Specification
    3. 7.3 High Speed Differential Signal Routing Guidance
    4. 7.4 Power Distribution Network Implementation Guidance
    5. 7.5 Thermal Solution Guidance
    6. 7.6 Single-Ended Interfaces
      1. 7.6.1 General Routing Guidelines
      2. 7.6.2 QSPI Board Design and Layout Guidelines
    7. 7.7 LJCB_REFN/P Connections
    8. 7.8 Clock Routing Guidelines
      1. 7.8.1 32-kHz Oscillator Routing
      2. 7.8.2 Oscillator Ground Connection
  8. 8Device and Documentation Support
    1. 8.1 Device Nomenclature
      1. 8.1.1 Standard Package Symbolization
      2. 8.1.2 Device Naming Convention
    2. 8.2 Tools and Software
    3. 8.3 Documentation Support
    4. 8.4 Related Links
    5. 8.5 Support Resources
    6. 8.6 Trademarks
    7. 8.7 Electrostatic Discharge Caution
    8. 8.8 Glossary
  9. 9Mechanical, Packaging, and Orderable Information
    1. 9.1 Packaging Information

Package Options

Refer to the PDF data sheet for device specific package drawings

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

4.3.19 eMMC/SD/SDIO

NOTE

For more information, see the HS MMC/SDIO section in the device TRM.

Table 4-20 eMMC/SD/SDIO Signal Descriptions

SIGNAL NAME DESCRIPTION TYPE BALL
Multi Media Card 1
mmc1_clk(1) MMC1 clock IO W6
mmc1_cmd MMC1 command IO Y6
mmc1_sdcd MMC1 Card Detect I W7
mmc1_sdwp MMC1 Write Protect I Y9
mmc1_dat0 MMC1 data bit 0 IO AA6
mmc1_dat1 MMC1 data bit 1 IO Y4
mmc1_dat2 MMC1 data bit 2 IO AA5
mmc1_dat3 MMC1 data bit 3 IO Y3
Multi Media Card 2
mmc2_clk(1) MMC2 clock IO J7
mmc2_cmd MMC2 command IO H6
mmc2_sdcd MMC2 Card Detect I G20
mmc2_sdwp MMC2 Write Protect I G19
mmc2_dat0 MMC2 data bit 0 IO J4
mmc2_dat1 MMC2 data bit 1 IO J6
mmc2_dat2 MMC2 data bit 2 IO H4
mmc2_dat3 MMC2 data bit 3 IO H5
mmc2_dat4 MMC2 data bit 4 IO K7
mmc2_dat5 MMC2 data bit 5 IO M7
mmc2_dat6 MMC2 data bit 6 IO J5
mmc2_dat7 MMC2 data bit 7 IO K6
Multi Media Card 3
mmc3_clk(1) MMC3 clock IO AD4
mmc3_cmd MMC3 command IO AC4
mmc3_sdcd MMC3 Card Detect I B21
mmc3_sdwp MMC3 Write Protect I B20
mmc3_dat0 MMC3 data bit 0 IO AC7
mmc3_dat1 MMC3 data bit 1 IO AC6
mmc3_dat2 MMC3 data bit 2 IO AC9
mmc3_dat3 MMC3 data bit 3 IO AC3
mmc3_dat4 MMC3 data bit 4 IO AC8
mmc3_dat5 MMC3 data bit 5 IO AD6
mmc3_dat6 MMC3 data bit 6 IO AB8
mmc3_dat7 MMC3 data bit 7 IO AB5
Multi Media Card 4
mmc4_clk(1) MMC4 clock IO E25
mmc4_cmd MMC4 command IO C27
mmc4_sdcd MMC4 Card Detect I B27
mmc4_sdwp MMC4 Write Protect I C26
mmc4_dat0 MMC4 data bit 0 IO D28
mmc4_dat1 MMC4 data bit 1 IO D26
mmc4_dat2 MMC4 data bit 2 IO D27
mmc4_dat3 MMC4 data bit 3 IO C28
  1. By default, this clock signal is implemented as 'pad loopback' inside the device - the output signal is looped back through the input buffer to serve as the internal reference signal. mmc1_clk and mmc2_clk have an optional software programmable setting to use an 'internal loopback clock' instead of the default 'pad loopback clock'. If the 'pad loopback clock' is used, series termination is recommended (as close to device pin as possible) to improve signal integrity of the clock input. Any nonmonotonicity in voltage that occurs at the pad loopback clock pin between VIH and VIL must be less than VHYS.