What are Clock Dedicated pins or Clock Capable pins in FPGAs ?

In Xilinx FPGAs, 𝗠𝗥𝗖𝗖 (Multi-Regional Clock Capable) and 𝗦𝗥𝗖𝗖 (Single-Regional Clock Capable) pins refer to specialized I/O pins that are designed to support clock signals with different routing capabilities across the FPGA device.

𝗠𝗥𝗖𝗖 (𝗠𝘂𝗹𝘁𝗶-𝗥𝗲𝗴𝗶𝗼𝗻𝗮𝗹 𝗖𝗹𝗼𝗰𝗸 𝗖𝗮𝗽𝗮𝗯𝗹𝗲):

Multi-Regional means that these pins are capable of driving a clock signal that can be distributed across multiple clock regions within the FPGA.

MRCC pins are typically located near the edge of the device and can drive clock resources that span a broader area of the FPGA.

These pins are used when you need to distribute a clock signal across several clock regions or the entire FPGA fabric.

𝗦𝗥𝗖𝗖 (𝗦𝗶𝗻𝗴𝗹𝗲-𝗥𝗲𝗴𝗶𝗼𝗻𝗮𝗹 𝗖𝗹𝗼𝗰𝗸 𝗖𝗮𝗽𝗮𝗯𝗹𝗲):

Single-Regional means that these pins are capable of driving a clock signal that is limited to a single clock region within the FPGA.

SRCC pins have more localized routing and are used when the clock signal is only needed within a single region of the FPGA fabric.

Both MRCC and SRCC pins are connected to dedicated clock routing resources within the FPGA, allowing efficient clock distribution with low skew and jitter. Choosing between MRCC and SRCC pins depends on the scope of your clock signal’s usage within the FPGA design.

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