T2 Telco Accelerator Card User Guide (UG1496)

Document ID
Release Date
1.0 English

The main features of the T2 card are as follows:

Card over-stress protection
The T2 card has a card protection circuit that initiates a fatal shutdown if either temperature or power consumption thresholds are crossed.

Before this threshold is reached, however, the SC signals to the Zynq UltraScale+ RFSoC to reduce the 5G workload power immediately. This indication is accomplished using the RF_CPU_RST and RF_RST_REQ handshake signals.

The precise threshold levels have been determined through testing and factory settings to ensure card safety. They cannot be changed.

Out-of-band telemetry
Telemetry data for the card is provided to the server board management controller (BMC) over the PCIe SM bus from the T2 SC. The PLDM over MCTP protocol is used for this communication between server BMC and T2 SC, and implements a thermal closed loop control mechanism for card cooling.

All required telemetry data, including board temperatures and power consumption, is available.

In-band telemetry
Telemetry data for the card is also available in-band over PCIe. The following telemetry data is available:
  • Zynq UltraScale+ RFSoC
  • Board inlet temperature
  • Board outlet temperature
  • DDR4 vicinity temperature
  • PCIe 12V current
  • In-band SC firmware update
Note: The PCIe 3.3V current is characterized (2.6A) but not measured.
In-band FPGA flash update
Updating the user flash image in-band over PCIe is supported using the flash_app utility provided in the host software installation. Details are found within the T2 Telco Accelerator Card Installation Guide (UG1527).

Some design components must be designed into the Zynq UltraScale+ RFSoC PL and PS to support this function.

Developer support
Developer support features for the Zynq UltraScale+ RFSoC on the T2 card are provided through the maintenance port. See Maintenance Port for details.
A green power-on LED is present on the I/O bracket to indicate the card is powered and in operation.