SPRSP52C December   2019  â€“ September 2023 AM6526 , AM6528 , AM6546 , AM6548

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
    1. 3.1 Functional Block Diagram
  5. 4 Device Comparison
    1. 4.1 Related Products
  6. 5 Terminal Configuration and Functions
    1. 5.1 Pin Diagram
    2. 5.2 Pin Attributes
    3. 5.3 Signal Descriptions
      1. 5.3.1  ADC
        1. 5.3.1.1 MCU Domain
      2. 5.3.2  CAL
        1. 5.3.2.1 MAIN Domain
      3. 5.3.3  CPSW2G
        1. 5.3.3.1 MCU Domain
      4. 5.3.4  DDRSS
        1. 5.3.4.1 MAIN Domain
        2. 5.3.4.2 DDRSS Mapping
      5. 5.3.5  DMTIMER
        1. 5.3.5.1 MAIN Domain
        2. 5.3.5.2 MCU Domain
      6. 5.3.6  DSS
        1. 5.3.6.1 MAIN Domain
      7. 5.3.7  ECAP
        1. 5.3.7.1 MAIN Domain
      8. 5.3.8  EHRPWM
        1. 5.3.8.1 MAIN Domain
      9. 5.3.9  EQEP
        1. 5.3.9.1 MAIN Domain
      10. 5.3.10 GPIO
        1. 5.3.10.1 MAIN Domain
        2. 5.3.10.2 WKUP Domain
      11. 5.3.11 GPMC
        1. 5.3.11.1 MAIN Domain
      12. 5.3.12 HyperBus
        1. 5.3.12.1 MCU Domain
      13. 5.3.13 I2C
        1. 5.3.13.1 MAIN Domain
        2. 5.3.13.2 MCU Domain
        3. 5.3.13.3 WKUP Domain
      14. 5.3.14 MCAN
        1. 5.3.14.1 MCU Domain
      15. 5.3.15 MCASP
        1. 5.3.15.1 MAIN Domain
      16. 5.3.16 MCSPI
        1. 5.3.16.1 MAIN Domain
        2. 5.3.16.2 MCU Domain
      17. 5.3.17 MMCSD
        1. 5.3.17.1 MAIN Domain
      18. 5.3.18 CPTS
        1. 5.3.18.1 MCU Domain
        2. 5.3.18.2 MAIN Domain
      19. 5.3.19 OLDI
        1. 5.3.19.1 MAIN Domain
      20. 5.3.20 OSPI
        1. 5.3.20.1 MCU Domain
      21. 5.3.21 PRU_ICSSG
        1. 5.3.21.1 MAIN Domain
      22. 5.3.22 SERDES
        1. 5.3.22.1 MAIN Domain
      23. 5.3.23 UART
        1. 5.3.23.1 MAIN Domain
        2. 5.3.23.2 MCU Domain
        3. 5.3.23.3 WKUP Domain
      24. 5.3.24 USB
        1. 5.3.24.1 MAIN Domain
      25. 5.3.25 Emulation and Debug
        1. 5.3.25.1 MAIN Domain
      26. 5.3.26 System and Miscellaneous
        1. 5.3.26.1 Boot Mode Configuration
          1. 5.3.26.1.1 MAIN Domain
          2. 5.3.26.1.2 MCU Domain
        2. 5.3.26.2 Clock
          1. 5.3.26.2.1 MAIN Domain
          2. 5.3.26.2.2 WKUP Domain
        3. 5.3.26.3 System
          1. 5.3.26.3.1 MAIN Domain
          2. 5.3.26.3.2 WKUP Domain
        4. 5.3.26.4 Miscellaneous
          1. 5.3.26.4.1 WKUP Domain
        5. 5.3.26.5 EFUSE
          1. 5.3.26.5.1 MAIN Domain
          2. 5.3.26.5.2 MCU Domain
      27. 5.3.27 Power Supply
    4. 5.4 Pin Multiplexing
    5. 5.5 Connections for Unused Pins
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Power-On Hours (POH)
    4. 6.4 Recommended Operating Conditions
    5. 6.5 Operating Performance Points
      1. 6.5.1 Voltage and Core Clock Specifications
    6. 6.6 Electrical Characteristics
      1. 6.6.1 I2C OPEN DRAIN DC Electrical Characteristics
      2. 6.6.2 Analog OSC Buffers DC Electrical Characteristics
      3. 6.6.3 Analog ADC DC Electrical Characteristics
      4. 6.6.4 DPHY CSI2 Buffers DC Electrical Characteristics
      5. 6.6.5 OLDI LVDS Buffers DC Electrical Characteristics
        1. 6.6.5.1 LVCMOS Buffers DC Electrical Characteristics
      6. 6.6.6 USBHS Buffers DC Electrical Characteristics
      7. 6.6.7 SERDES Buffers DC Electrical Characteristics
    7. 6.7 VPP Specifications for One-Time Programmable (OTP) eFuses
      1. 6.7.1 Recommended Operating Conditions for OTP eFuse Programming
      2. 6.7.2 Hardware Requirements
      3. 6.7.3 Programming Sequence
      4. 6.7.4 Impact to Your Hardware Warranty
    8. 6.8 Thermal Resistance Characteristics
      1. 6.8.1 Thermal Resistance Characteristics
    9. 6.9 Timing and Switching Characteristics
      1. 6.9.1 Timing Parameters and Information
      2. 6.9.2 Power Supply Sequencing
        1. 6.9.2.1 Power Supply Slew Rate Requirement
        2. 6.9.2.2 VDDA_1P8_SERDES0 Supply Slew Rate Requirement
        3. 6.9.2.3 Power-Up Sequencing
        4. 6.9.2.4 Power-Down Sequencing
      3. 6.9.3 System Timing
        1. 6.9.3.1 Reset Electrical Data/Timing
        2. 6.9.3.2 Safety Signal Timing
        3. 6.9.3.3 Clock Timing
      4. 6.9.4 Clock Specifications
        1. 6.9.4.1 Input Clocks / Oscillators
          1. 6.9.4.1.1 WKUP_OSC0 Internal Oscillator Clock Source
          2. 6.9.4.1.2 WKUP_OSC0 LVCMOS Digital Clock Source
          3. 6.9.4.1.3 Auxiliary OSC1 Internal Oscillator Clock Source
          4. 6.9.4.1.4 Auxiliary OSC1 LVCMOS Digital Clock Source
          5. 6.9.4.1.5 Auxiliary OSC1 Not Used
          6. 6.9.4.1.6 WKUP_LFOSC0 Internal Oscillator Clock Source
          7. 6.9.4.1.7 WKUP_LFOSC0 LVCMOS Digital Clock Source
          8. 6.9.4.1.8 WKUP_LFOSC0 Not Used
        2. 6.9.4.2 Output Clocks
        3. 6.9.4.3 PLLs
        4. 6.9.4.4 Recommended Clock and Control Signal Transition Behavior
        5. 6.9.4.5 Module and Peripheral Clock Frequencies
      5. 6.9.5 Peripherals
        1. 6.9.5.1  VIN
        2. 6.9.5.2  CPSW2G
          1. 6.9.5.2.1 CPSW2G MDIO Interface Timings
          2. 6.9.5.2.2 CPSW2G RMII Timings
            1. 6.9.5.2.2.1 Timing Requirements for RMII[x]_REFCLK - RMII Mode
            2. 6.9.5.2.2.2 Timing Requirements for RMII[x]_RXD[1:0], RMII[x]_CRS_DV, and RMII[x]_RXER - RMII Mode
            3. 6.9.5.2.2.3 Switching Characteristics for RMII[x]_TXD[1:0], and RMII[x]_TXEN - RMII Mode
          3. 6.9.5.2.3 CPSW2G RGMII Timings
            1. 6.9.5.2.3.1 Timing Requirements for RGMII[x]_RCLK - RGMII Mode
            2. 6.9.5.2.3.2 Timing Requirements for RGMII[x]_RD[3:0], and RGMII[x]_RCTL - RGMII Mode
            3. 6.9.5.2.3.3 Switching Characteristics for RGMII[x]_TCLK - RGMII Mode
            4. 6.9.5.2.3.4 Switching Characteristics for RGMII[x]_TD[3:0], and RGMII[x]_TX_CTL - RGMII Mode
        3. 6.9.5.3  CSI2
        4. 6.9.5.4  DDRSS
        5. 6.9.5.5  DSS
        6. 6.9.5.6  eCAP
          1. 6.9.5.6.1 eCAP Timing Requirements
          2. 6.9.5.6.2 eCAP Switching Characteristics
        7. 6.9.5.7  ePWM
          1. 6.9.5.7.1 ePWM Timing Requirements
          2. 6.9.5.7.2 ePWM Switching Characteristics
        8. 6.9.5.8  eQEP
          1. 6.9.5.8.1 eQEP Timing Requirements
          2. 6.9.5.8.2 eQEP Switching Characteristics
        9. 6.9.5.9  GPIO
          1. 6.9.5.9.1 GPIO Timing Requirements
          2. 6.9.5.9.2 GPIO Switching Characteristics
        10. 6.9.5.10 GPMC
          1. 6.9.5.10.1 GPMC and NOR Flash—Synchronous Mode
            1. 6.9.5.10.1.1 GPMC and NOR Flash Timing Requirements—Synchronous Mode
            2. 6.9.5.10.1.2 GPMC and NOR Flash Switching Characteristics—Synchronous Mode
          2. 6.9.5.10.2 GPMC and NOR Flash—Asynchronous Mode
            1. 6.9.5.10.2.1 GPMC and NOR Flash Timing Requirements—Asynchronous Mode
            2. 6.9.5.10.2.2 GPMC and NOR Flash Switching Characteristics—Asynchronous Mode
          3. 6.9.5.10.3 GPMC and NAND Flash—Asynchronous Mode
            1. 6.9.5.10.3.1 GPMC and NAND Flash Timing Requirements—Asynchronous Mode
            2. 6.9.5.10.3.2 GPMC and NAND Flash Switching Characteristics—Asynchronous Mode
        11. 6.9.5.11 HyperBus
          1. 6.9.5.11.1 Timing Requirements for HyperBus Initialization
          2. 6.9.5.11.2 HyperBus 166 MHz Switching Characteristics
          3. 6.9.5.11.3 HyperBus 100 MHz Switching Characteristics
        12. 6.9.5.12 I2C
        13. 6.9.5.13 MCAN
        14. 6.9.5.14 MCASP
          1. 6.9.5.14.1 MCASP Timing Requirements and Switching Characteristics
        15. 6.9.5.15 MCSPI
          1. 6.9.5.15.1 SPI—Master Mode
          2. 6.9.5.15.2 SPI—Slave Mode
        16. 6.9.5.16 MMCSD
          1. 6.9.5.16.1 MMCSDi — eMMC/SD/SDIO Card Interface
            1. 6.9.5.16.1.1 Default Speed, 3.3V Legacy SDR Mode
            2. 6.9.5.16.1.2 High Speed, 3.3V High Speed SDR Mode
            3. 6.9.5.16.1.3 UHS-I SDR12, 1.8-V Legacy SDR Mode
            4. 6.9.5.16.1.4 UHS-I SDR25 Mode
            5. 6.9.5.16.1.5 UHS-I DDR50 Mode
            6. 6.9.5.16.1.6 UHS-I SDR50 Mode
            7. 6.9.5.16.1.7 UHS-I SDR104 / HS200 Mode
        17. 6.9.5.17 CPTS
          1. 6.9.5.17.1 CPTS Timing Requirements
          2. 6.9.5.17.2 CPTS Switching Characteristics
        18. 6.9.5.18 OSPI
          1. 6.9.5.18.1 OSPI with Data Training
            1. 6.9.5.18.1.1 OSPI Switching Characteristics - Data Training
          2. 6.9.5.18.2 OSPI without Data Training
            1. 6.9.5.18.2.1 OSPI Timing Requirements - SDR Mode
            2. 6.9.5.18.2.2 OSPI Switching Characteristics - SDR Mode
            3. 6.9.5.18.2.3 OSPI Timing Requirements - DDR Mode
            4. 6.9.5.18.2.4 OSPI Switching Characteristics - DDR Mode
        19. 6.9.5.19 OLDI
          1. 6.9.5.19.1 OLDI Switching Characteristics
        20. 6.9.5.20 PCIE
        21. 6.9.5.21 PRU_ICSSG
          1. 6.9.5.21.1 Programmable Real-Time Unit (PRU_ICSSG PRU)
            1. 6.9.5.21.1.1 PRU_ICSSG PRU Direct Input/Output Mode Electrical Data and Timing
              1. 6.9.5.21.1.1.1 PRU_ICSSG PRU Switching Characteristics - Direct Output Mode
            2. 6.9.5.21.1.2 PRU_ICSSG PRU Parallel Capture Mode Electrical Data and Timing
              1. 6.9.5.21.1.2.1 PRU_ICSSG PRU Timing Requirements - Parallel Capture Mode
            3. 6.9.5.21.1.3 PRU_ICSSG PRU Shift Mode Electrical Data and Timing
              1. 6.9.5.21.1.3.1 PRU_ICSSG PRU Timing Requirements - Shift In Mode
              2. 6.9.5.21.1.3.2 PRU_ICSSG PRU Switching Characteristics - Shift Out Mode
            4. 6.9.5.21.1.4 PRU_ICSSG PRU Sigma Delta and Peripheral Interface Modes Electrical Data and Timing
              1. 6.9.5.21.1.4.1 PRU_ICSSG PRU Timing Requirements - Sigma Delta Mode
              2. 6.9.5.21.1.4.2 PRU_ICSSG PRU Timing Requirements - Peripheral Interface Mode
              3. 6.9.5.21.1.4.3 PRU_ICSSG PRU Switching Characteristics - Peripheral Interface Mode
          2. 6.9.5.21.2 PRU_ICSSG Pulse Width Modulation (PWM)
            1. 6.9.5.21.2.1 PRU_ICSSG PWM Electrical Data and Timing
              1. 6.9.5.21.2.1.1 PRU_ICSSG PWM Switching Characteristics
          3. 6.9.5.21.3 PRU_ICSSG Industrial Ethernet Peripheral (PRU_ICSSG IEP)
            1. 6.9.5.21.3.1 PRU_ICSSG IEP Electrical Data and Timing
              1. 6.9.5.21.3.1.1 PRU_ICSSG IEP Timing Requirements - Input Validated with SYNCx
              2. 6.9.5.21.3.1.2 PRU_ICSSG IEP Timing Requirements - Digital IOs
              3. 6.9.5.21.3.1.3 PRU_ICSSG IEP Timing Requirements - LATCHx_IN
          4. 6.9.5.21.4 PRU_ICSSG Universal Asynchronous Receiver Transmitter (PRU-ICSS UART)
            1. 6.9.5.21.4.1 PRU_ICSSG UART Electrical Data and Timing
              1. 6.9.5.21.4.1.1 PRU_ICSSG UART Timing Requirements
              2. 6.9.5.21.4.1.2 PRU_ICSSG UART Switching Characteristics
          5. 6.9.5.21.5 PRU_ICSSG Enhanced Capture Peripheral (PRU-ICSS ECAP)
            1. 6.9.5.21.5.1 PRU_ICSSG ECAP Electrical Data and Timing
              1. 6.9.5.21.5.1.1 PRU_ICSSG ECAP Timing Requirements
              2. 6.9.5.21.5.1.2 PRU_ICSSG ECAP Switching Characteristics
          6. 6.9.5.21.6 PRU_ICSSG RGMII, MII_RT, and Switch
            1. 6.9.5.21.6.1 PRU_ICSSG MDIO Electrical Data and Timing
              1. 6.9.5.21.6.1.1 PRU_ICSSG MDIO Timing Requirements
              2. 6.9.5.21.6.1.2 PRU_ICSSG MDIO Switching Characteristics - MDIO_CLK
              3. 6.9.5.21.6.1.3 PRU_ICSSG MDIO Switching Characteristics – MDIO_DATA
            2. 6.9.5.21.6.2 PRU_ICSSG RGMII Electrical Data and Timing
              1. 6.9.5.21.6.2.1 PRU_ICSSG RGMII Timing Requirements - RGMII_RXC
              2. 6.9.5.21.6.2.2 PRU_ICSSG RGMII Timing Requirements - RGMII_RD[3:0] and RGMII_RX_CTL
              3. 6.9.5.21.6.2.3 PRU_ICSSG RGMII Switching Characteristics - RGMII_TXC
              4. 6.9.5.21.6.2.4 PRU_ICSSG RGMII Switching Characteristics - RGMII_TD[3:0] and RGMII_TX_CTL
            3. 6.9.5.21.6.3 PRU_ICSSG MII_RT Electrical Data and Timing
              1. 6.9.5.21.6.3.1 PRU_ICSSG MII_RT Timing Requirements – MII_RX_CLK
              2. 6.9.5.21.6.3.2 PRU_ICSSG MII_RT Timing Requirements – MII_RXD[3:0], MII_RX_DV, and MII_RX_ER
              3. 6.9.5.21.6.3.3 PRU_ICSSG MII_RT Switching Characteristics – MII_TX_CLK
              4. 6.9.5.21.6.3.4 PRU_ICSSG MII_RT Switching Characteristics – MII_TXD[3:0] and MII_TXEN
        22. 6.9.5.22 Timers
          1. 6.9.5.22.1 Timing Requirements for Timers
          2. 6.9.5.22.2 Switching Characteristics for Timers
        23. 6.9.5.23 UART
          1. 6.9.5.23.1 Timing Requirements for UART
          2. 6.9.5.23.2 Switching Characteristics Over Recommended Operating Conditions for UART
        24. 6.9.5.24 USB
        25. 6.9.5.25 Emulation and Debug
          1. 6.9.5.25.1 Debug Trace
          2. 6.9.5.25.2 JTAG
            1. 6.9.5.25.2.1 JTAG Electrical Data and Timing
              1. 6.9.5.25.2.1.1 JTAG Timing Requirements
              2. 6.9.5.25.2.1.2 JTAG Switching Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Processor Subsystems
      1. 7.2.1 Arm Cortex-A53
      2. 7.2.2 Arm Cortex-R5F
    3. 7.3 Accelerators and Coprocessors
      1. 7.3.1 PRU_ICSSG
        1. 7.3.1.1 PRU_ICSSG PRU and RTU_PRU Cores
        2. 7.3.1.2 PRU_ICSSG Broadside Accelerators Overview
        3. 7.3.1.3 PRU_ICSSG UART Module
        4. 7.3.1.4 PRU_ICSSG ECAP Module
        5. 7.3.1.5 PRU_ICSSG PWM Module
        6. 7.3.1.6 PRU_ICSSG MII_G_RT Module
        7. 7.3.1.7 PRU_ICSSG MII MDIO Module
        8. 7.3.1.8 PRU_ICSSG IEP
      2. 7.3.2 GPU
    4. 7.4 Other Subsystems
      1. 7.4.1 DMSC
      2. 7.4.2 MSMC
      3. 7.4.3 NAVSS
        1. 7.4.3.1 NAVSS0
        2. 7.4.3.2 MCU_NAVSS0
      4. 7.4.4 PDMA Controller
      5. 7.4.5 Peripherals
        1. 7.4.5.1  ADC
        2. 7.4.5.2  CAL
        3. 7.4.5.3  CPSW2G
        4. 7.4.5.4  DCC
        5. 7.4.5.5  DDRSS
        6. 7.4.5.6  DSS
        7. 7.4.5.7  Đ•CAP
        8. 7.4.5.8  EPWM
        9. 7.4.5.9  ELM
        10. 7.4.5.10 ESM
        11. 7.4.5.11 EQEP
        12. 7.4.5.12 GPIO
        13. 7.4.5.13 GPMC
        14. 7.4.5.14 HyperBus
        15. 7.4.5.15 I2C
        16. 7.4.5.16 MCAN
        17. 7.4.5.17 MCASP
        18. 7.4.5.18 MCRC
        19. 7.4.5.19 MCSPI
        20. 7.4.5.20 MMCSD
        21. 7.4.5.21 OSPI
        22. 7.4.5.22 PCIE
        23. 7.4.5.23 SerDes
        24. 7.4.5.24 RTI
        25. 7.4.5.25 Timers
        26. 7.4.5.26 UART
        27. 7.4.5.27 USB
    5. 7.5 Identification
      1. 7.5.1 Revision Identification
      2. 7.5.2 Die Identification
      3. 7.5.3 JTAG Identification
      4. 7.5.4 ROM Code Identification
    6. 7.6 Boot Modes
  9. 8 Applications, Implementation, and Layout
    1. 8.1 Device Connection and Layout Fundamentals
      1. 8.1.1 Power Supply Decoupling and Bulk Capacitors
        1. 8.1.1.1 Power Distribution Network Implementation Guidance
      2. 8.1.2 External Oscillator
      3. 8.1.3 JTAG and EMU
      4. 8.1.4 Reset
      5. 8.1.5 Unused Pins
      6. 8.1.6 Hardware Design Guide for AM65x/DRA80xM Devices
    2. 8.2 Peripheral- and Interface-Specific Design Information
      1. 8.2.1 DDR Board Design and Layout Guidelines
      2. 8.2.2 OSPI Board Design and Layout Guidelines
        1. 8.2.2.1 No Loopback and Internal Pad Loopback
        2. 8.2.2.2 External Board Loopback
        3. 8.2.2.3 DQS (Only Available in Octal Flash Devices)
      3. 8.2.3 USB Design Guidelines
      4. 8.2.4 High Speed Differential Signal Routing Guidance
      5. 8.2.5 System Power Supply Monitor Design Guidelines
      6. 8.2.6 MMC Design Guidelines
      7. 8.2.7 Integrated Power Management Features
      8. 8.2.8 External Capacitors
        1. 8.2.8.1 LVCMOS External Capacitor Connections
      9. 8.2.9 Thermal Solution Guidance
  10. 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 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
    1. 11.1 Packaging Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • ACD|784
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.5.1 Voltage and Core Clock Specifications

Table 6-2 through Table 6-3 defines the device Operating Performance Points (OPPs). As shown in these tables, each OPP defines a voltage and frequency pair for a given voltage domain supply.

Note:

This device, when used in a production system, only supports one static OPP over the lifetime of the device. When designing a production system, a fixed OPP should be selected based on the maximum frequency required by the system. The corresponding OPP voltage must then be exclusively used by the device.

Table 6-2 VDD_MPU0 OPPs
VDD_MPU0 OPPs(1) VDD_MPU0 MPU0
MIN NOM MAX
OPP_NOM 1.06 1.1 1.16 800 MHz
OPP_OD 1.14 1.2 1.26 1 GHz
OPP_TURBO 1.2 1.24 1.28 1.1 GHz
(1) For additional details about supported AVS Voltages, refer to the footnotes associated with Section 6.4, Recommended Operating Conditions.
Table 6-3 VDD_MPU1 OPPs
VDD_MPU1 OPPs(1) VDD_MPU1 MPU1
MIN NOM MAX
OPP_NOM 1.06 1.1 1.16 800 MHz
OPP_OD 1.14 1.2 1.26 1 GHz
OPP_TURBO 1.2 1.24 1.28 1.1 GHz
(1) For additional details about supported AVS Voltages, refer to the footnotes associated with Section 6.4, Recommended Operating Conditions.

Table 6-4 describes the standard processor clocks speed characteristics vs OPP of the device.

Table 6-4 Supported OPP vs Max Frequency
CLOCK(1)(2) OPP_NOM OPP_OD OPP_TURBO
MAXIMUM FREQUENCY (MHz) MAXIMUM FREQUENCY (MHz) MAXIMUM FREQUENCY (MHz)
VD_CORE
GPU 450 N/A N/A
DDR4 800 (DDR-1600) N/A N/A
CBASS0 250 N/A N/A
ICSSG 250 N/A N/A
VD_MPU0
MPU0 800 1000 1100
VD_MPU1
MPU1 800 1000 1100
VD_MCU
MCU 400 N/A N/A
VD_WKUP
DMSC 200 N/A N/A
(1) N/A stands for Not Applicable.
(2) Maximum supported frequency is limited to the device speed grade (see Table 6-1, Speed Grade Maximum Frequency).