SNLS614A September   2018  – December 2018 DP83869HM

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Standard Ethernet System Block Diagram
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
    1.     RGZ Package (VQFN) Pin Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Timing Requirements
    7. 8.7 Typical Characteristics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  WoL (Wake-on-LAN) Packet Detection
        1. 9.3.1.1 Magic Packet Structure
        2. 9.3.1.2 Magic Packet Example
        3. 9.3.1.3 Wake-on-LAN Configuration and Status
      2. 9.3.2  Start of Frame Detect for IEEE 1588 Time Stamp
        1. 9.3.2.1 SFD Latency Variation and Determinism
          1. 9.3.2.1.1 1000-Mb SFD Variation in Master Mode
          2. 9.3.2.1.2 1000-Mb SFD Variation in Slave Mode
          3. 9.3.2.1.3 100-Mb SFD Variation
      3. 9.3.3  Clock Output
      4. 9.3.4  Loopback Mode
        1. 9.3.4.1 Near-End Loopback
          1. 9.3.4.1.1 MII Loopback
          2. 9.3.4.1.2 PCS Loopback
          3. 9.3.4.1.3 Digital Loopback
          4. 9.3.4.1.4 Analog Loopback
          5. 9.3.4.1.5 External Loopback
          6. 9.3.4.1.6 Far-End (Reverse) Loopback
      5. 9.3.5  BIST Configuration
      6. 9.3.6  Interrupt
      7. 9.3.7  Power-Saving Modes
        1. 9.3.7.1 IEEE Power Down
        2. 9.3.7.2 Active Sleep
        3. 9.3.7.3 Passive Sleep
      8. 9.3.8  Mirror Mode
      9. 9.3.9  Speed Optimization
      10. 9.3.10 Cable Diagnostics
        1. 9.3.10.1 TDR
      11. 9.3.11 Fast Link Drop
      12. 9.3.12 Jumbo Frames
    4. 9.4 Device Functional Modes
      1. 9.4.1  Copper Ethernet
        1. 9.4.1.1 1000BASE-T
        2. 9.4.1.2 100BASE-TX
        3. 9.4.1.3 10BASE-Te
      2. 9.4.2  Fiber Ethernet
        1. 9.4.2.1 1000BASE-X
        2. 9.4.2.2 100BASE-FX
      3. 9.4.3  Serial GMII (SGMII)
      4. 9.4.4  Reduced GMII (RGMII)
        1. 9.4.4.1 1000-Mbps Mode Operation
        2. 9.4.4.2 1000-Mbps Mode Timing
        3. 9.4.4.3 10- and 100-Mbps Mode
      5. 9.4.5  Media Independent Interface (MII)
      6. 9.4.6  Bridge Modes
        1. 9.4.6.1 RGMII-to-SGMII Mode
        2. 9.4.6.2 SGMII-to-RGMII Mode
      7. 9.4.7  Media Convertor Mode
      8. 9.4.8  Register Configuration for Operational Modes
        1. 9.4.8.1 RGMII-to-Copper Ethernet Mode
        2. 9.4.8.2 RGMII-to-1000Base-X Mode
        3. 9.4.8.3 RGMII-to-SGMII Bridge Mode
        4. 9.4.8.4 1000M Media Convertor Mode
        5. 9.4.8.5 100M Media Convertor Mode
        6. 9.4.8.6 SGMII-to-Copper Ethernet Mode
      9. 9.4.9  Serial Management Interface
        1. 9.4.9.1 Extended Address Space Access
          1. 9.4.9.1.1 Write Address Operation
          2. 9.4.9.1.2 Read Address Operation
          3. 9.4.9.1.3 Write (No Post Increment) Operation
          4. 9.4.9.1.4 Read (No Post Increment) Operation
          5. 9.4.9.1.5 Write (Post Increment) Operation
          6. 9.4.9.1.6 Read (Post Increment) Operation
          7. 9.4.9.1.7 Example of Read Operation Using Indirect Register Access
          8. 9.4.9.1.8 Example of Write Operation Using Indirect Register Access
      10. 9.4.10 Auto-Negotiation
        1. 9.4.10.1 Speed and Duplex Selection - Priority Resolution
        2. 9.4.10.2 Master and Slave Resolution
        3. 9.4.10.3 Pause and Asymmetrical Pause Resolution
        4. 9.4.10.4 Next Page Support
        5. 9.4.10.5 Parallel Detection
        6. 9.4.10.6 Restart Auto-Negotiation
        7. 9.4.10.7 Enabling Auto-Negotiation Through Software
        8. 9.4.10.8 Auto-Negotiation Complete Time
        9. 9.4.10.9 Auto-MDIX Resolution
    5. 9.5 Programming
      1. 9.5.1 Strap Configuration
        1. 9.5.1.1 Straps for PHY Address
        2. 9.5.1.2 Strap for DP83869HM Functional Mode Selection
        3. 9.5.1.3 Straps for RGMII/SGMII to Copper
        4. 9.5.1.4 Straps for RGMII to 1000Base-X
        5. 9.5.1.5 Straps for RGMII to 100Base-FX
        6. 9.5.1.6 Straps for Bridge Mode (SGMII-RGMII)
        7. 9.5.1.7 Straps for 100M Media Convertor
        8. 9.5.1.8 Straps for 1000M Media Convertor
      2. 9.5.2 LED Configuration
      3. 9.5.3 Reset Operation
        1. 9.5.3.1 Hardware Reset
        2. 9.5.3.2 IEEE Software Reset
        3. 9.5.3.3 Global Software Reset
        4. 9.5.3.4 Global Software Restart
    6. 9.6 Register Maps
      1. 9.6.1 DP83869 Registers
        1. 9.6.1.1  BMCR Register (Address = 0x0) [reset = 0x1140]
          1. Table 21. BMCR Register Field Descriptions
        2. 9.6.1.2  BMSR Register (Address = 0x1) [reset = 0x7949]
          1. Table 22. BMSR Register Field Descriptions
        3. 9.6.1.3  PHYIDR1 Register (Address = 0x2) [reset = 0x2000]
          1. Table 23. PHYIDR1 Register Field Descriptions
        4. 9.6.1.4  PHYIDR2 Register (Address = 0x3) [reset = 0xA0F1]
          1. Table 24. PHYIDR2 Register Field Descriptions
        5. 9.6.1.5  ANAR Register (Address = 0x4) [reset = 0x1]
          1. Table 25. ANAR Register Field Descriptions
        6. 9.6.1.6  ALNPAR Register (Address = 0x5) [reset = 0x0]
          1. Table 26. ALNPAR Register Field Descriptions
        7. 9.6.1.7  ANER Register (Address = 0x6) [reset = 0x64]
          1. Table 27. ANER Register Field Descriptions
        8. 9.6.1.8  ANNPTR Register (Address = 0x7) [reset = 0x2001]
          1. Table 28. ANNPTR Register Field Descriptions
        9. 9.6.1.9  ANLNPTR Register (Address = 0x8) [reset = 0x2001]
          1. Table 29. ANLNPTR Register Field Descriptions
        10. 9.6.1.10 GEN_CFG1 Register (Address = 0x9) [reset = 0x300]
          1. Table 30. GEN_CFG1 Register Field Descriptions
        11. 9.6.1.11 GEN_STATUS1 Register (Address = 0xA) [reset = 0x0]
          1. Table 31. GEN_STATUS1 Register Field Descriptions
        12. 9.6.1.12 REGCR Register (Address = 0xD) [reset = 0x0]
          1. Table 32. REGCR Register Field Descriptions
        13. 9.6.1.13 ADDAR Register (Address = 0xE) [reset = 0x0]
          1. Table 33. ADDAR Register Field Descriptions
        14. 9.6.1.14 1KSCR Register (Address = 0xF) [reset = 0xF000]
          1. Table 34. 1KSCR Register Field Descriptions
        15. 9.6.1.15 PHY_CONTROL Register (Address = 0x10) [reset = 0x5048]
          1. Table 35. PHY_CONTROL Register Field Descriptions
        16. 9.6.1.16 PHY_STATUS Register (Address = 0x11) [reset = 0x0]
          1. Table 36. PHY_STATUS Register Field Descriptions
        17. 9.6.1.17 INTERRUPT_MASK Register (Address = 0x12) [reset = 0x0]
          1. Table 37. INTERRUPT_MASK Register Field Descriptions
        18. 9.6.1.18 INTERRUPT_STATUS Register (Address = 0x13) [reset = 0x0]
          1. Table 38. INTERRUPT_STATUS Register Field Descriptions
        19. 9.6.1.19 GEN_CFG2 Register (Address = 0x14) [reset = 0x29C7]
          1. Table 39. GEN_CFG2 Register Field Descriptions
        20. 9.6.1.20 RX_ERR_CNT Register (Address = 0x15) [reset = 0x0]
          1. Table 40. RX_ERR_CNT Register Field Descriptions
        21. 9.6.1.21 BIST_CONTROL Register (Address = 0x16) [reset = 0x0]
          1. Table 41. BIST_CONTROL Register Field Descriptions
        22. 9.6.1.22 GEN_STATUS2 Register (Address = 0x17) [reset = 0x40]
          1. Table 42. GEN_STATUS2 Register Field Descriptions
        23. 9.6.1.23 LEDS_CFG1 Register (Address = 0x18) [reset = 0x6150]
          1. Table 43. LEDS_CFG1 Register Field Descriptions
        24. 9.6.1.24 LEDS_CFG2 Register (Address = 0x19) [reset = 0x4444]
          1. Table 44. LEDS_CFG2 Register Field Descriptions
        25. 9.6.1.25 LEDS_CFG3 Register (Address = 0x1A) [reset = 0x2]
          1. Table 45. LEDS_CFG3 Register Field Descriptions
        26. 9.6.1.26 GEN_CFG4 Register (Address = 0x1E) [reset = 0x12]
          1. Table 46. GEN_CFG4 Register Field Descriptions
        27. 9.6.1.27 GEN_CTRL Register (Address = 0x1F) [reset = 0x0]
          1. Table 47. GEN_CTRL Register Field Descriptions
        28. 9.6.1.28 ANALOG_TEST_CTRL Register (Address = 0x25) [reset = 0x480]
          1. Table 48. ANALOG_TEST_CTRL Register Field Descriptions
        29. 9.6.1.29 GEN_CFG_ENH_AMIX Register (Address = 0x2C) [reset = 0x141F]
          1. Table 49. GEN_CFG_ENH_AMIX Register Field Descriptions
        30. 9.6.1.30 GEN_CFG_FLD Register (Address = 0x2D) [reset = 0x0]
          1. Table 50. GEN_CFG_FLD Register Field Descriptions
        31. 9.6.1.31 GEN_CFG_FLD_THR Register (Address = 0x2E) [reset = 0x221]
          1. Table 51. GEN_CFG_FLD_THR Register Field Descriptions
        32. 9.6.1.32 GEN_CFG3 Register (Address = 0x31) [reset = 0x10B0]
          1. Table 52. GEN_CFG3 Register Field Descriptions
        33. 9.6.1.33 RGMII_CTRL Register (Address = 0x32) [reset = 0xD0]
          1. Table 53. RGMII_CTRL Register Field Descriptions
        34. 9.6.1.34 RGMII_CTRL2 Register (Address = 0x33) [reset = 0x0]
          1. Table 54. RGMII_CTRL2 Register Field Descriptions
        35. 9.6.1.35 SGMII_AUTO_NEG_STATUS Register (Address = 0x37) [reset = 0x0]
          1. Table 55. SGMII_AUTO_NEG_STATUS Register Field Descriptions
        36. 9.6.1.36 PRBS_TX_CHK_CTRL Register (Address = 0x39) [reset = 0x0]
          1. Table 56. PRBS_TX_CHK_CTRL Register Field Descriptions
        37. 9.6.1.37 PRBS_TX_CHK_BYTE_CNT Register (Address = 0x3A) [reset = 0x0]
          1. Table 57. PRBS_TX_CHK_BYTE_CNT Register Field Descriptions
        38. 9.6.1.38 G_100BT_REG0 Register (Address = 0x43) [reset = 0x7A0]
          1. Table 58. G_100BT_REG0 Register Field Descriptions
        39. 9.6.1.39 SERDES_SYNC_STS Register (Address = 0x4F) [reset = 0x0]
          1. Table 59. SERDES_SYNC_STS Register Field Descriptions
        40. 9.6.1.40 STRAP_STS Register (Address = 0x6E) [reset = 0x0]
          1. Table 60. STRAP_STS Register Field Descriptions
        41. 9.6.1.41 ANA_RGMII_DLL_CTRL Register (Address = 0x86) [reset = 0x77]
          1. Table 61. ANA_RGMII_DLL_CTRL Register Field Descriptions
        42. 9.6.1.42 RXF_CFG Register (Address = 0x134) [reset = 0x1000]
          1. Table 62. RXF_CFG Register Field Descriptions
        43. 9.6.1.43 RXF_STATUS Register (Address = 0x135) [reset = 0x0]
          1. Table 63. RXF_STATUS Register Field Descriptions
        44. 9.6.1.44 IO_MUX_CFG Register (Address = 0x170) [reset = X]
          1. Table 64. IO_MUX_CFG Register Field Descriptions
        45. 9.6.1.45 TDR_GEN_CFG1 Register (Address = 0x180) [reset = 0x752]
          1. Table 65. TDR_GEN_CFG1 Register Field Descriptions
        46. 9.6.1.46 TDR_GEN_CFG2 Register (Address = 0x181) [reset = 0xC850]
          1. Table 66. TDR_GEN_CFG2 Register Field Descriptions
        47. 9.6.1.47 TDR_SEG_DURATION1 Register (Address = 0x182) [reset = 0x5326]
          1. Table 67. TDR_SEG_DURATION1 Register Field Descriptions
        48. 9.6.1.48 TDR_SEG_DURATION2 Register (Address = 0x183) [reset = 0xA01E]
          1. Table 68. TDR_SEG_DURATION2 Register Field Descriptions
        49. 9.6.1.49 TDR_GEN_CFG3 Register (Address = 0x184) [reset = 0xE976]
          1. Table 69. TDR_GEN_CFG3 Register Field Descriptions
        50. 9.6.1.50 TDR_GEN_CFG4 Register (Address = 0x185) [reset = 0x19CF]
          1. Table 70. TDR_GEN_CFG4 Register Field Descriptions
        51. 9.6.1.51 TDR_PEAKS_LOC_A_0_1 Register (Address = 0x190) [reset = 0x0]
          1. Table 71. TDR_PEAKS_LOC_A_0_1 Register Field Descriptions
        52. 9.6.1.52 TDR_PEAKS_LOC_A_2_3 Register (Address = 0x191) [reset = 0x0]
          1. Table 72. TDR_PEAKS_LOC_A_2_3 Register Field Descriptions
        53. 9.6.1.53 TDR_PEAKS_LOC_A_4_B_0 Register (Address = 0x192) [reset = 0x0]
          1. Table 73. TDR_PEAKS_LOC_A_4_B_0 Register Field Descriptions
        54. 9.6.1.54 TDR_PEAKS_LOC_B_1_2 Register (Address = 0x193) [reset = 0x0]
          1. Table 74. TDR_PEAKS_LOC_B_1_2 Register Field Descriptions
        55. 9.6.1.55 TDR_PEAKS_LOC_B_3_4 Register (Address = 0x194) [reset = 0x0]
          1. Table 75. TDR_PEAKS_LOC_B_3_4 Register Field Descriptions
        56. 9.6.1.56 TDR_PEAKS_LOC_C_0_1 Register (Address = 0x195) [reset = 0x0]
          1. Table 76. TDR_PEAKS_LOC_C_0_1 Register Field Descriptions
        57. 9.6.1.57 TDR_PEAKS_LOC_C_2_3 Register (Address = 0x196) [reset = 0x0]
          1. Table 77. TDR_PEAKS_LOC_C_2_3 Register Field Descriptions
        58. 9.6.1.58 TDR_PEAKS_LOC_C_4_D_0 Register (Address = 0x197) [reset = 0x0]
          1. Table 78. TDR_PEAKS_LOC_C_4_D_0 Register Field Descriptions
        59. 9.6.1.59 TDR_PEAKS_LOC_D_1_2 Register (Address = 0x198) [reset = 0x0]
          1. Table 79. TDR_PEAKS_LOC_D_1_2 Register Field Descriptions
        60. 9.6.1.60 TDR_PEAKS_LOC_D_3_4 Register (Address = 0x199) [reset = 0x0]
          1. Table 80. TDR_PEAKS_LOC_D_3_4 Register Field Descriptions
        61. 9.6.1.61 TDR_GEN_STATUS Register (Address = 0x1A4) [reset = 0x0]
          1. Table 81. TDR_GEN_STATUS Register Field Descriptions
        62. 9.6.1.62 TDR_PEAKS_SIGN_A_B Register (Address = 0x1A5) [reset = 0x0]
          1. Table 82. TDR_PEAKS_SIGN_A_B Register Field Descriptions
        63. 9.6.1.63 TDR_PEAKS_SIGN_C_D Register (Address = 0x1A6) [reset = 0x0]
          1. Table 83. TDR_PEAKS_SIGN_C_D Register Field Descriptions
        64. 9.6.1.64 OP_MODE_DECODE Register (Address = 0x1DF) [reset = 0x40]
          1. Table 84. OP_MODE_DECODE Register Field Descriptions
        65. 9.6.1.65 GPIO_MUX_CTRL Register (Address = 0x1E0) [reset = 0x417A]
          1. Table 85. GPIO_MUX_CTRL Register Field Descriptions
        66. 9.6.1.66 FX_CTRL Register (Address = 0xC00) [reset = 0x1140]
          1. Table 86. FX_CTRL Register Field Descriptions
        67. 9.6.1.67 FX_STS Register (Address = 0xC01) [reset = 0x6149]
          1. Table 87. FX_STS Register Field Descriptions
        68. 9.6.1.68 FX_PHYID1 Register (Address = 0xC02) [reset = 0x2000]
          1. Table 88. FX_PHYID1 Register Field Descriptions
        69. 9.6.1.69 FX_PHYID2 Register (Address = 0xC03) [reset = 0xA0F1]
          1. Table 89. FX_PHYID2 Register Field Descriptions
        70. 9.6.1.70 FX_ANADV Register (Address = 0xC04) [reset = 0x20]
          1. Table 90. FX_ANADV Register Field Descriptions
        71. 9.6.1.71 FX_LPABL Register (Address = 0xC05) [reset = 0x0]
          1. Table 91. FX_LPABL Register Field Descriptions
        72. 9.6.1.72 FX_ANEXP Register (Address = 0xC06) [reset = 0x0]
          1. Table 92. FX_ANEXP Register Field Descriptions
        73. 9.6.1.73 FX_LOCNP Register (Address = 0xC07) [reset = 0x2001]
          1. Table 93. FX_LOCNP Register Field Descriptions
        74. 9.6.1.74 FX_LPNP Register (Address = 0xC08) [reset = 0x0]
          1. Table 94. FX_LPNP Register Field Descriptions
        75. 9.6.1.75 FX_INT_EN Register (Address = 0xC18) [reset = 0x3FF]
          1. Table 95. FX_INT_EN Register Field Descriptions
        76. 9.6.1.76 FX_INT_STS Register (Address = 0xC19) [reset = 0x0]
          1. Table 96. FX_INT_STS Register Field Descriptions
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Applications
      1. 10.2.1 Copper Ethernet Typical Application
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
          1. 10.2.1.2.1 Clock Input
            1. 10.2.1.2.1.1 Crystal Recommendations
            2. 10.2.1.2.1.2 External Clock Source Recommendation
          2. 10.2.1.2.2 Magnetics Requirements
            1. 10.2.1.2.2.1 Magnetics Connection
        3. 10.2.1.3 Application Curves
      2. 10.2.2 Fiber Ethernet Typical Ethernet
        1. 10.2.2.1 Design Requirements
        2. 10.2.2.2 Detailed Design Procedure
          1. 10.2.2.2.1 Transceiver Connections
        3. 10.2.2.3 Application Curves
  11. 11Power Supply Recommendations
    1. 11.1 Two Supply Configuration
    2. 11.2 Three Supply Configuration
  12. 12Layout
    1. 12.1 Layout Guidelines
      1. 12.1.1 Signal Traces
        1. 12.1.1.1 MAC Interface Layout Guidelines
          1. 12.1.1.1.1 SGMII Layout Guidelines
          2. 12.1.1.1.2 RGMII Layout Guidelines
        2. 12.1.1.2 MDI Layout Guidelines
      2. 12.1.2 Return Path
      3. 12.1.3 Transformer Layout
      4. 12.1.4 Metal Pour
      5. 12.1.5 PCB Layer Stacking
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
    2. 13.2 Receiving Notification of Documentation Updates
    3. 13.3 Community Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

9.6.1.66 FX_CTRL Register (Address = 0xC00) [reset = 0x1140]

FX_CTRL is shown in Figure 98 and described in Table 86.

Return to Summary Table.

Registers after 0xC00 are common for Fiber, SGMII IP blocks for RGMII-to-SGMII, SGMII-to-RGMII, and Media Convertor.

Figure 98. FX_CTRL Register
15 14 13 12 11 10 9 8
CTRL0_RESET CTRL0_LOOPBACK CTRL0_SPEED_SEL_LSB CTRL0_ANEG_EN CTRL0_PWRDN CTRL0_ISOLATE CTRL0_RESTART_AN CTRL0_DUPLEX_MODE
R/W-0x0 R/W-0x0 R/W-0x0 R/W-0x1 R/W-0x0 R/W-0x0 R/W-0x0 R/W-0x1
7 6 5 4 3 2 1 0
CTRL0_COL_TEST CTRL0_SPEED_SEL_MSB RESERVED
R/W-0x0 R/W-0x1 R/W-0x0

Table 86. FX_CTRL Register Field Descriptions

Bit Field Type Reset Description
15 CTRL0_RESET R/W 0x0

Controls reset in Fiber mode. This bit is automatically cleared after reset is completed.

0x0 = Normal Operation

0x1 = Reset.

14 CTRL0_LOOPBACK R/W 0x0

100BASE-X, 1000BASE-FX and RGMII-SGMII, SGMII-RGMII MAC loopback.

0x0 = Disable MAC loopback

0x1 = Enable MAC Loopback

13 CTRL0_SPEED_SEL_LSB R/W 0x0

Speed selection bits LSB[13] and MSB[6] are used to control the data rate of the ethernet link when in Fiber Ethernet mode. These bits are also affected by straps.

0x0 = 10Mbps

0x1 = 100Mbps

0x2 = 1000Mbps

0x3 = Reserved

12 CTRL0_ANEG_EN R/W 0x1

Enable 1000BASE-X, R2S, S2R Bridge mode Auto-negotiation. Controlled by strap.

0x0 = Disable

0x1 = Enable

11 CTRL0_PWRDN R/W 0x0

Power Down SGMII for R2S, S2R, 1000BX, 100FX. Digital is in reset.

0x0 = Normal operation

0x1 = Power Down

10 CTRL0_ISOLATE R/W 0x0

Isolate MAC interface. Used in 1000BX, 100FX and RGMII-SGMII mode. N/A in SGMII-RGMII mode.

0x0 = Normal operation

0x1 = Isolate

9 CTRL0_RESTART_AN R/W 0x0

Writing 1 to this control bit restarts Autoneg in SGMII and 1000B-X mode. It is self-cleared by hardware.

0x0 = Normal operation

0x1 = Restart 1000BASE-X/SGMII Auto-Negotiation Process

8 CTRL0_DUPLEX_MODE R/W 0x1

Forced Duplex mode. Applicable only in MII-100FX mode.

0x0 = Half duplex mode

0x1 = Full duplex mode

7 CTRL0_COL_TEST R/W 0x0

Used to test collision functionality. Settings this bit asserts collision on just asserting tx_en
6 CTRL0_SPEED_SEL_MSB R/W 0x1

Forced Speed for SGMII only when Autoneg is disabled. Controlled by straps. See bit 13 of this register.
5-0 RESERVED R/W 0x0

Reserved