GEM Interface Implementations

Versal Adaptive SoC Technical Reference Manual (AM011)

Document ID
Release Date
1.6 English

MPSoC to Versal Adaptive SoC GEM Comparisons

The AMD Versal™ adaptive SoC GEM interface is similar to the controller in the AMD Zynq™ UltraScale+™ MPSoC.

  • Added features
    • Time sensitive network (TSN)
    • New RXFIFO high and low-level watermarks use pause frames for RX flow control
    • Large segment offload (LSO) WANs added
  • Removed features
    • PS SGMII via PS GTR (PCS internal to GEM)
    • 1000 BASE-x physical coding sublayer (PCS)
    • Ten-bit interface (TBI) to PL via EMIO

GEM Implementations

The gigabit ethernet MAC (GEM) interface has remained mostly the same for all SoCs.

Table 1. GEM Implementations
Device Generation GEM Controller
UltraScale+ MPSoC See above.
Versal device GXL and RGMII Gigabit Ethernet MAC chapter (Cadence version r1p12). Two in PS LPD.