Cyclone® 10 GX Core Fabric and General Purpose I/Os Handbook
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4.1.3.3. Periphery Clock Networks
PCLK networks provide the lowest insertion delay and the same skew as RCLK networks.
Small Periphery Clock Networks
Each HSSI or I/O bank has 12 SPCLKs. SPCLKs cover one SCLK spine region in HSSI bank and one SCLK spine region in I/O bank adjacent to each other in the same row.
Large Periphery Clock Networks
Each HSSI or I/O bank has 2 LPCLKs. LPCLKs have larger network coverage compared to SPCLKs. LPCLKs cover one SCLK spine region in HSSI bank and one SCLK spine region in I/O bank adjacent to each other in the same row.