diff options
Diffstat (limited to 'common/rtl/clkmgr_dcm.v')
| -rw-r--r-- | common/rtl/clkmgr_dcm.v | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/common/rtl/clkmgr_dcm.v b/common/rtl/clkmgr_dcm.v index 5651b93..7c851f1 100644 --- a/common/rtl/clkmgr_dcm.v +++ b/common/rtl/clkmgr_dcm.v @@ -51,13 +51,14 @@ module clkmgr_dcm // // Parameters // - parameter CLK_OUT_MUL = 2; - parameter CLK_OUT_DIV = 2; + parameter CLK_OUT_MUL = 2; // multiply factor for output clock frequency (2..32) + parameter CLK_OUT_DIV = 2; // divide factor for output clock frequency (1..32) // // DCM_SP // + /* Xilinx-specific primitive. */ wire dcm_clk_0; wire dcm_clk_feedback; wire dcm_clk_fx; @@ -121,6 +122,7 @@ module clkmgr_dcm // // Feedback // + /* DCM_SP requires BUFG primitive in its feedback path. */ BUFG BUFG_feedback ( .I (dcm_clk_0), @@ -130,6 +132,7 @@ module clkmgr_dcm // // Output Buffer // + /* Connect system clock to global clocking network. */ BUFG BUFG_output ( .I (dcm_clk_fx), |