4.1.3. Clock Sources Per Quadrant
The Cyclone® V devices provide 30 section clock (SCLK) networks in each spine clock per quadrant. The SCLK networks can drive six row clocks in each logic array block (LAB) row, nine column I/O clocks, and two core reference clocks. The SCLKs are the clock resources to the core functional blocks, PLLs, and I/O interfaces of the device.
A spine clock is another layer of routing between the GCLK, RCLK, and PCLK networks before each clock is connected to the clock routing for each LAB row. The settings for spine clocks are transparent. The Intel® Quartus® Prime software automatically routes the spine clock based on the GCLK, RCLK, and PCLK networks.
The following figure shows SCLKs driven by the GCLK, RCLK, PCLK, or the PLL feedback clock networks in each spine clock per quadrant. The GCLK, RCLK, PCLK, and PLL feedback clocks share the same routing to the SCLKs. To ensure successful design fitting in the Intel® Quartus® Prime software, the total number of clock resources must not exceed the SCLK limits in each region.
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