Texas Instruments J721EXENETXPANEVM User manual

User’s Guide
Jacinto7 EVM Quad Port Ethernet Expansion Board
User’s Guide
Table of Contents
1 Introduction.............................................................................................................................................................................2
1.1 Key Features......................................................................................................................................................................2
1.2 Thermal Compliance.......................................................................................................................................................... 2
1.3 EMC, EMI, and ESD Compliance...................................................................................................................................... 2
2 QP-ENET Board Identification and Installation....................................................................................................................3
2.1 QP-ENET Board Component Identification........................................................................................................................3
2.2 Interfacing QP-ENET Expansion Board with J784S4XG01EVM Board.............................................................................4
3 QP-ENET Expansion Board Hardware Architecture............................................................................................................9
3.1 QP-ENET Expansion Board Hardware Top Level Diagram............................................................................................... 9
3.2 Expansion Connectors....................................................................................................................................................... 9
3.3 Board ID EEPROM.......................................................................................................................................................... 10
3.4 Ethernet Interface.............................................................................................................................................................11
4 Revision History................................................................................................................................................................... 14
A Appendix...............................................................................................................................................................................15
A.1 Appendix – I (Interface Mapping).....................................................................................................................................15
A.2 Appendix – II (QP-ENET Board GPIO Mapping)............................................................................................................. 15
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1 Introduction
The Jacinto7 EVMs are development and evaluation systems that enable developers to write software and
develop hardware around the Jacinto7 family of processors. The main elements of the system are available on
the EVM system itself. This gives developers the basic resources needed for most general-purpose type projects
that encompass the Jacinto7 processor.
Beyond the basic resources provided, additional functionality can be added via expansion cards.
This Technical User’s Guide describes the hardware architecture of the Jacinto7 EVM – Quad Port Ethernet
Expansion board (QP-ENET), which is interfaced with J7 EVM boards through Serial Ethernet Expansion
Connector.
1.1 Key Features
Key features of QP-ENET:
• Ethernet
– 4x 10/100/1000Mbps - SGMII ports (VSC8514XMK-11)
• Board ID EEPROM
• Programmable Clock Generator
The orderable part number is provided in the table below:
Jacinto7 EVM Add-on Module
Quad Port Ethernet Expansion J721EXENETXPANEVM
1.2 Thermal Compliance
There is elevated heat on the processor/heatsink: use caution, particularly at elevated ambient temperatures.
Although the processor/heatsink is not a burn hazard, caution should be used when handling the EVM due to
increased heat in the area of the heatsink.
1.3 EMC, EMI, and ESD Compliance
Components installed on the product are sensitive to Electrostatic Discharge (ESD). TI recommends that this
product be used in an ESD controlled environment. This may include a temperature and/or humidity controlled
environment to limit the build-up of ESD. TI also recommends using ESD protection such as wrist straps and
ESD mats when interfacing with the product.
The product is used in the basic electromagnetic environment as in laboratory condition and the applied
standard will be as per EN IEC 61326-1:2021.
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2 QP-ENET Board Identification and Installation
2.1 QP-ENET Board Component Identification
Figure 2-1. QP-ENET Expansion Board Component Identification
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2.2 Interfacing QP-ENET Expansion Board with J784S4XG01EVM Board
QP-ENET Expansion boards shall be interfaced with Jacinto7 J784S4XG01EVM in bottom mating
configurations. The images below show the J7AHP EVM board connectors J51 and J52, which mate with the
QP-ENET board as an example, with expansion connectors J3 on the QP-ENET mated to the SGMII Expansion
connectors on the J7AHP EVM. It is valid to support/install on only one QP-ENET board, and in either location.
Figure 2-2. QP-ENET Expansion Board Bottom Side
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Figure 2-3. Q/SGMII Expansion Connector on J784S4XG01EVM Bottom Side
2.2.1 Detailed Board Assembly Procedure (J784S4XG01EVM)
This assembly procedure example is given for mating the QP-ENET board with the J784S4XG01EVM board.
1. Take the Assembled J784S4XG01EVM Board
2. Add M2.5 x 5mm hex spacers on each mounting holes provided on either sides of the J51 & J52 connector
of the J784S4XG01EVM and secure it with M2.5 x 4 mm Phillips screws from the bottom sides to hold the
spacer in place.
3. Add M3 x 12mm Phillips screws through the mounting hole provided between the Ethernet connectors on
the QP ENET board (shown in the picture below) and secure it with a M3 x 5mm hex spacer from the other
side (this step is done only on the QP ENET board).
4. Mount the QP board onto the J784S4XG01EVM connectors J51 & J52, making sure the connectors are
seated evenly.
5. Add M2.5 x 4 mm Phillips screws from the top side of the QP to secure the QP mating with the
J784S4XG01EVM board.
6. Add the M2.5 x 5 mm male to male spacer from the top side of the J784S4XG01EVM board to secure the
remaining M3 screw protruding from the QP.
7. Add a M3 x 5mm spacer from the top side of the J784S4XG01EVM board to lock the other end of the M3
x12mm Phillips screw.
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Figure 2-4. QP ENET Board
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Figure 2-5. Bottom Side of J784S4XG01EVM
Figure 2-6. Top Side of J784S4XG01EVM
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Figure 2-7. J784S4XG01EVM - QP ENET Board Assembly Procedure
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3 QP-ENET Expansion Board Hardware Architecture
This section explains the Hardware Architecture of QP-ENET Expansion Board in detail.
3.1 QP-ENET Expansion Board Hardware Top Level Diagram
The generic functional block diagram of the QP-ENET Expansion Board is shown below.
Figure 3-1. Functional Block Diagram of QP-ENET Expansion Board
3.2 Expansion Connectors
The J784S4XG01EVM board includes two Serial Ethernet Expansion connectors of 171446-1109 with 5-mm
mating height, allowing the ENET expansion board (Quad-Port Ethernet Expansion) to be stacked on bottom
side of the board.
This section provides an overview of the different interfaces and circuits on the Quad port Ethernet Expansion
Board. The following table contains the Pin out/Signal mapping for the ENET Expansion connector.
Table 3-1. ENET Expansion Connector J3 Pinouts
PIN Net Name PIN Net Name
1 DGND 31 QSGMII_INTN
2 NC 32 DGND
3 NC 33 QSGMII4_TX_P
4 DGND 34 QSGMII4_TX_N
5 NC 35 DGND
6 NC 36 QSGMII4_RX_P
7 DGND 37 QSGMII4_RX_N
8 NC 38 DGND
9 NC 39 QSGMII_PHY_REFCLK_N
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Table 3-1. ENET Expansion Connector J3 Pinouts (continued)
PIN Net Name PIN Net Name
10 DGND 40 QSGMII_PHY_REFCLK_P
11 VSYS_IO_3V3 41 DGND
12 VSYS_IO_3V3 42 QSGMII_MDC
13 DGND 43 QSGMII_MDIO
14 EEPROM_A0 44 DGND
15 EEPROM_A1 45 QSGMII_RESETN
16 EEPROM_A2 46 CDCI_I2C_SEL
17 DGND 47 ENET_EXP_SPARE
18 EEPROM_WP 48 DGND
19 REFCLK_25MHZ 49 VSYS_5V0
20 DGND 50 VSYS_5V0
21 WKUP_I2C0_SCL 51 DGND
22 WKUP_I2C0_SDA 52 NC
23 DGND 53 NC
24 I2C0_SCL 54 DGND
25 I2C0_SDA 55 VCC_3V3
26 DGND 56 VCC_3V3
27 VCC_12V0 57 DGND
28 VCC_12V0 58 NC
29 DGND 59 NC
30 ENET_EXP_PWRDN 60 DGND
SH1 DGND SH2 DGND
3.3 Board ID EEPROM
The Quad port Ethernet Expansion Board is identified by its version and serial number, which are stored in the
onboard EEPROM. On the J784S4XG01EVM, there are two QP-ENET expansion connectors available: one
QP-ENET is set to address 0x54, the other one is set to 0x51, which are accessible on WKUP_I2C0.
The first 259 bytes of addressable EEPROM memory are preprogrammed with identification information for each
board. The remaining 32509 bytes are available to the user for data or code storage.
Figure 3-2. Board ID EEPROM
Table 3-2. Board ID Memory Header Information
Header Field Name Size (bytes) Description
MAGIC 4 Magic Number
TYPE 1 Fixed length and variable position board ID
header
2 Size of payload
BRD_INFO TYPE 1 Payload type
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