The SZG-ENET1G is a 10/100/1000 Mb/s RGMII Ethernet PHY module featuring the Texas Instruments DP83867 PHY. This module is an excellent choice for adding Ethernet connectivity to your SYZYGY carrier board. Connection to the PHY through the RJ-45 cage allows standard Ethernet cable to be used.
- Aligni PLM – See the Attachments tab for schematics and Altium Designer project files.
- SYZYGY Specification
- SYZYGY GitHub Site – Several projects that could be helpful.
- Ethernet Example Design on XEM8320 – While this example design targets the XEM8320, the sources can be modified to be used on any SYZYGY carrier with relative ease.
Strapping resistor locations have been added to pins RXD0, RXD2, and RXD4 on the PCB for specifying the address of the PHY when using the Serial Management Interface. These are not populated, giving the device an address of 0x00. You can read how to strap these pins in the DP83867 datasheet.
Strapping resistor locations have been added to pin RXD7. These resistors are not populated, enabling the clock output. By default this clock output is synchronous to the XI oscillator / crystal input and is outputted to the CLK_OUT pin.
Ethernet MAC ID PROM
This is an EEPROM device Pre-Programmed with a EUI-48™ MAC Address that has been assigned by the IEEE Registration Authority. It is accessed via I2C at the 7 bit address 0x57. The most significant byte for the 48 bit MAC address is at address 0xFA and the least significant byte is at address 0xFF. You can read more about this in the 24AA025E48’s datasheet.
RJ-45 Cage LEDs
The RJ-45 cage used has three LEDs whose on/off states are controlled by the LED_0, LED_1, and LED_2 pins from the PHY. Green and orange LEDs are on the left hand side of the cage which will combine to show brown if both are luminated. A yellow LED is on the right hand side of the cage. The following connections and default behavior are as follows:
- Yellow (LED_2) on right side of cage: RX/TX Activity
- Orange (LED_1) on left side of cage: 1000 Link Up
- Green (LED_0) on left side of cage: Any Link Up
|Port type||SYZYGY Standard|
|5V supply required||No|
|Nominal 5V supply current||N/A|
|Nominal 3.3V supply current||150mA|
|VIO supply voltage||1.8V, 2.5V or 3.3V|
|Nominal VIO supply current||35mA|
|Total number of I/O||16|
|Number of differential I/O pairs||0|
|Max 5V Load||0mA|
|Max 3.3V Load||150mA|
|Max VIO Load||35mA|
|VIO Range(s)||[1.8,1.8], [2.5,2.5], [3.3,3.3]|
|20 (S15)||Not Connected|
|21 (S16)||Not Connected|
|22 (S17)||Not Connected|
|23 (S18)||Not Connected|
|24 (S19)||Not Connected|
|25 (S20)||Not Connected|
|26 (S21)||Not Connected|
|27 (S22)||Not Connected|
|35 (P2C_CLKn)||Not Connected|