The ACAP (U1) bank 204 and 205 GTM transceivers are wired to the QSFP-DD connector J1. The ACAP (U1) bank 202 and 203 GTM transceivers are wired to the QSFP-DD connector J2. The connector is Molex connector 2147334000.
The lane selections to J1 have been optimized for 400GAUI-4 operation by ensuring that the legacy connections are connected to the appropriate GTM transceivers. J2 has limited 100+G support and is recommended for 58G per lane use cases such as 400GAUI-8 or 4x100GAUI-2. See the schematic pages 10 and 45 for connectivity details.
See the Versal ACAP GTM Transceivers Architecture Manual (AM017) for more details on GTM-Quad limitations.