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4.5 Power Supply

Figure 4-3 shows the SoM’s power distribution system. The Power to the SoM is derived from the Dual Buck

converter 12 V to 5.0 V / 3.3 V on the Common Processor Board. The J721E processor is powered from a dual

TPS6594x PMIC solution, which is optimized for the J721E to support a wide variety of use cases.

Dual load switch TPS22976-Q1 provides the switching option for the LPDDR4 I/O power supply (1.1 V / 0.6 V).

Figure 4-3. J721E SOM Power Distribution Block Diagram

www.ti.com J721E EVM Hardware Architecture

SPRUIS4D – MAY 2020 – REVISED MARCH 2022

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Jacinto7 J721E/DRA829/TDA4VM Evaluation Module (EVM) 31

Table of Contents1
Introduction4
Key Features4
Thermal Compliance5
Figure 1-1. Thermal Caution5
REACH Compliance6
EMC, EMI, and ESD Compliance6
J721E EVM Overview6
Figure 2-1. J721E EVM Board6
Table 1-1. REACH Compliance6
Figure 2-2. System Architecture Interface7
J721E EVM Board Identification8
Figure 2-3. J721E EVM Board Identification (SOM, CPB, QP Ethernet)8
J721E SOM Component Identification9
Figure 2-4. J721E SOM Component Identification9
Jacinto7 Common Processor Components Identification10
Figure 2-5. Jacinto7 Common Processor Component Identification10
Quad Ethernet Components Identification11
Figure 2-6. Quad Ethernet Component Identification11
EVM User Setup/Configuration12
Power Requirements12
Figure 3-1. Connector Used for Power Input12
Table 3-1. Recommended External Power Supply12
Power on Switch and Power Leds13
Figure 3-2. Power ON/OFF Switch13
Figure 3-3. Power On/Fault Leds14
Table 3-2. Power LED Status14
Figure 3-4. Power Status Leds15
Table 3-3. Power Leds15
Table 3-4. Power Test Points16
EVM Reset/Interrupt Push Buttons17
Figure 3-5. EVM Push Buttons17
Table 3-5. EVM Push Buttons17
EVM DIP Switches18
Figure 3-6. EVM Configuration DIP Switch18
Table 3-6. EVM Configuration Switch Function19
Table 3-7. EVM Configuration Switch Function20
Figure 3-7. BOOT Switches Provided on the Processor Card21
Table 3-8. Wakup Boot Mode Switch (SW9)21
Table 3-9. Main Boot Mode Switch (SW8)21
EVM UART/COM Port Mapping22
Table 3-10. UART Port Mapping22
JTAG Emulation23
Figure 3-8. JTAG Mux23
Table 3-11. JTAG 1:2 Mux Selection23
Table 3-12. TI 60 Pin Connector (J16) Pinout24
Table 3-13. Cti20 Pin Connector (J1-Refer PROC081E2 SCH) Pinout25
Table 3-14. TI14 Pin Connector (J2-Refer PROC081E2 SCH) Pinout25
J721E EVM Hardware Architecture26
J721E EVM Hardware Top Level Diagram26
Figure 4-1. J721E EVM Functional Block Diagram26
Figure 4-2. Quad Port Ethernet Expansion Functional Block Diagram27
J721E EVM Interface Mapping28
Table 4-1. J721E EVM Interface Mapping28
I2C Address Mapping29
Table 4-2. J721E EVM I2C Table29
GPIO Mapping30
Table 4-3. J721E Soc - GPIO Mapping Table30
Power Supply31
Figure 4-3. J721E SOM Power Distribution Block Diagram31
Figure 4-4. Power on Sequencing32
Figure 4-5. Voltage Supervisor Circuit33
Figure 4-6. LPDDR4 IO Voltage Selection Circuit34
Table 4-4. DDR I/O Voltage Selection34
Table 4-5. J721E Soc S2R Logic Flow35
Table 4-6. J721E Soc S2R Logic Flow35
Table 4-7. INA Devices I2C Slave Address36
Table 4-8. External Power Monitor Header Pinouts37
Reset38
Figure 4-7. EVM Reset Architecture38
Clock39
Figure 4-8. EVM Clock Architecture39
Figure 4-9. J721E Soc Primary Clock40
Table 4-9. Processor's Secondary/Serdes Ref Clock41
Table 4-10. EVM Peripheral Ref Clock41
Memory Interfaces42
Figure 4-10. J721E Som LPDDR442
Figure 4-11. J721E Som OSPI and Hyper Flash43
Figure 4-12. UFS Memory Block Diagram44
Figure 4-13. Emmc Memory Block Diagram45
Figure 4-14. Micro-SD Card Block Diagram46
Table 4-11. Board ID Memory Header Information47
MCU Ethernet Interface48
Figure 4-15. MCU Gigabit Ethernet Block48
Figure 4-16. MCU Ethernet PHY Settings49
QSGMII Ethernet Interface50
Table 4-12. Clock Source Selection50
Figure 4-17. Quad-SGMII Board I2C51
Pcie Interface52
Figure 4-18. QSGMII Ethernet PHY Settings52
Figure 4-19. Pcie Interface for SERDES053
Figure 4-20. Pcie SMBUS Block Diagram53
Figure 4-21. 1L-Pcie Root Complex/Endpoint Selection Circuit54
Table 4-13. Reference Clock Selection for Pcie Host Operation54
Table 4-14. Reference Clock Selection for Pcie Endpoint Operation54
Figure 4-22. USB2.0 Header Connection55
Table 4-15. Resistors for Selecting Pcie Card Host or Device55
Figure 4-23. Pcie Interface for SERDES156
Figure 4-24. 2L-Pcie Root Complex/Endpoint Selection Circuit56
Table 4-16. Reference Clock Selection for Pcie Host Operation57
Table 4-17. Reference Clock Selection for Pcie Endpoint Operation57
Table 4-18. Resistors for Selecting Pcie Card Host or Device Operation57
USB Interface58
Figure 4-25. Pcie Interface for SERDES258
Figure 4-26. USB3.1 Type C Interface59
Figure 4-27. Type C Power Delivery Current Settings59
Figure 4-28. USB Hub Reference Clock Circuit60
Figure 4-29. USB Hub Settings Circuit60
Figure 4-30. USB1 ID Setting for HUB60
CAN Interface61
Figure 4-31. MCU CAN0 Interface61
Figure 4-32. CAN Wake Push Button62
Figure 4-33. CAN Header Connections to Db9/Test Instrument63
FPD Interface (Audio Deserializer)64
Figure 4-34. FPD-Link UB926 ID Setting Circuit64
Figure 4-35. FPD-Link UB926 Mode Selection Circuit64
FPD Panel Interface (DSI Video Serializer)65
Figure 4-36. FPD-Link UB941A Device Settings Circuit65
Table 4-19. FPD Audio Deserializer HSD Connector Pinout65
Table 4-20. DSI to FPD Serializer HSD Connector Pinout65
Display Serial Interface (DSI) FPC66
Audio Interface66
Table 4-21. MCASP/TRACE - 1:3 MUX: Truth Table66
Table 4-22. Config Table66
Figure 4-37. Audio Port Interface Assignment67
Display Port Interface68
MLB Interface68
Figure 4-38. Display Port Block Diagram68
Figure 4-39. MLB Interface Connector69
Table 4-23. MLB Header Pinout69
I3C Interface70
ADC Interface70
Figure 4-40. ADC Interface Connector70
Table 4-24. MCU I3C Header J33 Pinout70
Table 4-25. MAIN I3C Header J3270
RTC Interface71
Figure 4-41. RTC Block Diagram71
Table 4-26. ADC Header J2371
Apple Authentication Header72
Figure 4-42. Apple Authentication Block Diagram72
Table 4-27. APPLE AUTH Header J972
EVM Expansion Connectors73
Figure 4-43. Expansion Board Interface Connectors73
Table 4-28. APPLE AUTH Footprint U108 Pinout73
Table 4-29. EVM Expansion Connector J4674
Table 4-30. EVM Expansion Connector J5176
ENET Expansion Connector77
Table 4-31. ENET Expansion Board Power Test Points77
Figure 4-44. CDCI I2C Isolation Circuit78
Table 4-32. ENET Expansion Connector J10 Pinout79
Table 4-33. CSI Expansion Connector J52 Pinout82
Table 4-34. CSI Expansion Connector J48 Pinout82

Brand	Texas Instruments
Model	J721E
Category	Motherboard
Language	English

Texas Instruments J721E User Manual

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