diff --git a/libboard_zynq_us/src/slcr/crf_apb.rs b/libboard_zynq_us/src/slcr/crf_apb.rs
new file mode 100644
index 0000000..a2ed421
--- /dev/null
+++ b/libboard_zynq_us/src/slcr/crf_apb.rs
@@ -0,0 +1,102 @@
+///! FPD clock and reset control
+
+use volatile_register::{RO, RW, WO};
+use libregister::{
+    register, register_at,
+    register_bit, register_bits,
+};
+
+#[repr(C)]
+pub struct RegisterBlock {
+    // CRF_APB
+    pub err_ctrl: RW<u32>,
+    pub ir_status: RW<u32>,  // todo: WTC LSB
+    pub ir_mask: RO<u32>,
+    pub ir_enable: WO<u32>,
+    pub ir_disable: WO<u32>,
+    pub crf_wprot: RW<u32>,
+    pub apll_ctrl: PllCtrl,
+    pub apll_cfg: PllCfg,
+    pub apll_frac_cfg: PllFracCfg,
+    pub dpll_ctrl: PllCtrl,
+    pub dpll_cfg: PllCfg,
+    pub dpll_frac_cfg: PllFracCfg,
+    pub vpll_ctr: PllCtrl,
+    pub vpll_cfg: PllCfg,
+    pub vpll_frac_cfg: PllFracCfg,
+    pub pll_status: PllStatus,
+    pub apll_to_lpd_ctrl: PllToLpdCtrl,
+    pub dpll_to_lpd_ctrl: PllToLpdCtrl,
+    pub vpll_to_lpd_ctrl: PllToLpdCtrl,
+    reserved1: [u32; 3],
+    pub apu_clk_ctrl: ApuClkCtrl,
+    pub dbg_trace_clk_ctrl: RW<u32>,
+    pub dbg_fpd_clk_ctrl: RW<u32>,
+    reserved2: [u32; 1],
+    pub dp_video_clk_ctrl: RW<u32>,
+    pub dp_audio_clk_ctrl: RW<u32>,
+    reserved3: [u32; 1],
+    pub dp_sys_clk_ctrl: RW<u32>,
+    pub ddr_clk_ctrl: DdrClkCtrl,
+    pub gpu_clk_ctrl: RW<u32>,
+    reserved4: [u32; 6],
+    pub sata_clk_ctrl: RW<u32>,
+    reserved5: [u32; 4],
+    pub pcie_clk_ctrl: RW<u32>,
+    pub fpd_dma_clk_ctrl: RW<u32>,
+    pub dp_dma_clk_ctrl: RW<u32>,
+    pub topsw_main_clk_ctrl: RW<u32>,
+    pub topsw_lsbus_clk_ctrl: RW<u32>,
+    reserved6: [u32; 8],
+    pub dbg_tstmp_clk_ctrl: RW<u32>,
+    reserved7: [u32; 1],
+    pub rst_fpd_top: RW<u32>,
+    pub rst_fpd_apu: RW<u32>,
+    pub rst_ddr_ss: RW<u32>,
+}
+register_at!(RegisterBlock, 0xFD1A_0000, crf_apb);
+
+register!(pll_ctrl, PllCtrl, RW, u32);
+register_bits!(pll_ctrl, post_src, u8, 24, 26);
+register_bits!(pll_ctrl, pre_src, u8, 20, 22);
+register_bit!(pll_ctrl, div2, 16);
+register_bits!(pll_ctrl, fbdiv, u8, 8, 14);
+register_bit!(pll_ctrl, bypass, 3);
+register_bit!(pll_ctrl, reset, 0);
+
+register!(pll_cfg, PllCfg, RW, u32);
+register_bits!(pll_cfg, lock_dly, u8, 25, 31);
+register_bits!(pll_cfg, lock_cnt, u16, 13, 22);
+register_bits!(pll_cfg, lfhf, u8, 10, 11);
+register_bits!(pll_cfg, cp, u8, 5, 8);
+register_bits!(pll_cfg, res, u8, 0, 3);
+
+register!(pll_frac_cfg, PllFracCfg, RW, u32);
+register_bit!(pll_frac_cfg, enabled, 31);
+register_bits!(pll_frac_cfg, data, u16, 0, 15);
+
+register!(pll_status, PllStatus, RO, u32);
+register_bit!(pll_status, vpll_stable, 5);
+register_bit!(pll_status, dpll_stable, 4);
+register_bit!(pll_status, apll_stable, 3);
+register_bit!(pll_status, vpll_lock, 2);
+register_bit!(pll_status, dpll_lock, 1);
+register_bit!(pll_status, apll_lock, 0);
+
+register!(pll_to_lpd_ctrl, PllToLpdCtrl, RW, u32);
+register_bits!(pll_to_lpd_ctrl, divisor0, u8, 8, 13);
+
+register!(apu_clk_ctrl, ApuClkCtrl, RW, u32);
+register_bit!(apu_clk_ctrl, clkact_half, 25);
+register_bit!(apu_clk_ctrl, clkact_full, 24);
+register_bits!(apu_clk_ctrl, divisor0, u8, 8, 13);
+// 000: APLL
+// 010: DPLL
+// 011: VPLL
+register_bits!(apu_clk_ctrl, srcsel, u8, 0, 2);
+
+register!(ddr_clk_ctrl, DdrClkCtrl, RW, u32);
+register_bits!(ddr_clk_ctrl, divisor0, u8, 8, 13);
+// 000: DPLL
+// 001: VPLL
+register_bits!(ddr_clk_ctrl, srcsel, u8, 0, 2);
diff --git a/libboard_zynq_us/src/slcr/mod.rs b/libboard_zynq_us/src/slcr/mod.rs
new file mode 100644
index 0000000..14b0578
--- /dev/null
+++ b/libboard_zynq_us/src/slcr/mod.rs
@@ -0,0 +1,14 @@
+///! Register definitions for UltraScale+ System Level Control
+pub mod crf_apb;
+// APU
+// FPD_SLCR
+// FPD_SLCR_SECURE
+// IOU_SLCR
+// IOU_SECURE_SLCR
+// IOU_SCNTRS
+// LPD_SLCR
+// LPD_SLCR_SECURE
+// CRL_APB
+// RPU
+// CCI_GPV
+// FPD_GPV
\ No newline at end of file