The SZG-QSFP is a SYZYGY Transceiver (TXR4) peripheral with one cage for an appropriate QSFP+ module.

• Aligni PLM – See the Attachments tab for schematics.
• SYZYGY Specification
• SYZYGY GitHub Site – Several projects that could be helpful.

The SZG-QSFP allows connecting a QSFP+ module to an FPGA transceiver bank via the SYZYGY TXR4 port. All of the QSFP+ module control signals are connected to IO and have level shifting on board to allow for a variety of compatible bank voltages.

An on board 156.25Mhz oscillator is provided as a transceiver reference clock. This frequency is compatible with a variety of Ethernet protocols.

Normally the QSFP control signals are tri-stated (high impedance) whenever either 3.3V or VIO is down. However this function can be manually controlled via an I/O pin, if required. To do so remove R5 and place R7 and R8.

See the SZG-QSFP schematic for more information.

• Column PIN NUM (J1) lists the pin number on the SYZYGY specification’s Standard Samtec connector, this is reference designator J1 in the schematic.
• Column SIGNAL NAME lists the SYZYGY specification’s name for this pin’s connection.
• Column SCHEMATIC NET lists the net name found in the SZG-QSFP’s schematic for the connection.