20.2.6.4.2 FIC_2_APB_M_PRESET_N
This is an APB reset signal to the FPGA fabric interface.
SYSRESET_N is synchronized on FIC_2_APB_M_PCLK generated in the MSS CCC, which is driven to the FPGA fabric and then the synchronized reset is again flopped on the negative edge of M3_CLK.
The following figure shows the generation of FIC_2_APB_M_PRESET_N.