The Versal architecture GTM transceiver provides the highest performances and integration at 7 nm, including serial I/O bandwidth and logic capacity. As the industry's high-end FPGA at the 7 nm process node, this family is ideal for applications including 400G networking, large-scale ASIC prototyping, and emulation.
The GTM transceiver in the Versal architecture is a power-efficient transceiver, supporting line rates between 9.5 Gb/s and 112 Gb/s. Based on the available PLL divider configurations in the GTM transceivers, the following line rates are supported:
- NRZ Modulation:
- 9.5 Gb/s – 15 Gb/s
- 19 Gb/s – 29 Gb/s
- PAM4 Modulation
- 19 Gb/s – 30 Gb/s
- 38 Gb/s – 60 Gb/s
- 76 Gb/s – 112 Gb/s
The Versal ACAP GTM transceiver is Xilinx's highest performance PAM4 enabled transceiver and is highly configurable and tightly integrated with the programmable logic resources of the FPGA. The following table summarizes the features by functional group that support a wide variety of applications.
|PRBS generator and checker
|Programmable FPGA logic interface
|LC tank oscillator PLL (LCPLL) for best jitter performance
|Flexible clocking with two LCPLLs per Quad 1 (four channels)
|Programmable transmitter (TX) output
|TX FIR filter with de-emphasis controls
|Continuous time linear equalization (CTLE)
|Decision feedback equalization (DFE)
|Feed forward equalization (FFE)
The GTM transceiver supports NRZ and PAM4 modulation as well as the following protocols:
- 400GE CDAUI4
- 400GE CDAUI8
- 100GE CAUI2
- 100GE CAUI4
- 100GE CAUI1
- 50GE LAUI
- 50GE LAUI2
- Multirate CPRI from 10.1 Gb/s to 100 Gb/s
- Interlaken at 51.5625 Gb/s, 25 Gb/s, 12.5 Gb/s
- 112G XSR
- 56 Gb/s PAM4 Backplane
- 56.52 Gb/s PAM4 Midplanes
- 28.21 Gb/s PAM4 Backplanes
- 802.3bj Backplanes and Cables
The first-time user is recommended to read High-Speed Serial I/O made Simple, which discuss high-speed serial transceiver technology and its applications. The Vivado® IP integrator or the transceiver Wizard design flow is recommended to automatically configure the GTM transceiver to support configurations for different protocols or perform custom configurations. The GTM transceiver offers a data rate range and features that allow physical layer support for various protocols.
The following figure illustrates the clustering of four transceiver channels and two high speed clocking (HSCLK) blocks to form the GTME5_QUAD primitive.
Four channel clustered together with two HSCLK blocks form a Quad or Q. Each HSCLK block contain one LC-tank PLL (LCPLL). The LCPLL from each HSCLK can provide clock to any of the four channels inside the same Quad. Each channel consists of a transmitter and a receiver. The following figure illustrates the topology of the GTM channel.