ZY7_SLCR_FPGA_CLK_CTRL
reg = RD4(sc, ZY7_SLCR_FPGA_CLK_CTRL(unit));
WR4(sc, ZY7_SLCR_FPGA_CLK_CTRL(unit), reg);
reg = RD4(sc, ZY7_SLCR_FPGA_CLK_CTRL(unit));
reg = RD4(sc, ZY7_SLCR_FPGA_CLK_CTRL(unit));
WR4(sc, ZY7_SLCR_FPGA_CLK_CTRL(unit), reg);
reg = RD4(sc, ZY7_SLCR_FPGA_CLK_CTRL(unit));