From b468d92e39927835b5b5b4b315eafc9e6459c3fb Mon Sep 17 00:00:00 2001
From: Alex Forencich <alex@alexforencich.com>
Date: Mon, 17 Mar 2025 21:00:12 -0700
Subject: [PATCH] hip: Report error if fractional MMCM configuration does not
 work

Signed-off-by: Alex Forencich <alex@alexforencich.com>
---
 rtl/hip/us/taxi_mmcm_frac.sv | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/rtl/hip/us/taxi_mmcm_frac.sv b/rtl/hip/us/taxi_mmcm_frac.sv
index be2cdb0..52ba1a0 100644
--- a/rtl/hip/us/taxi_mmcm_frac.sv
+++ b/rtl/hip/us/taxi_mmcm_frac.sv
@@ -39,6 +39,11 @@ localparam DIR = OFFSET_NUM >= 0;
 localparam NUM_1 = (DIR ? OFFSET_NUM : -OFFSET_NUM)*56*MMCM_OUTPUT_DIV;
 localparam DENOM_1 = OFFSET_DENOM;
 
+localparam MMCM_MIN_PSCLK_CYCLES = 12;
+
+if (DENOM_1 / NUM_1 < MMCM_MIN_PSCLK_CYCLES)
+    $fatal(0, "Error: requested offset is too large for MMCM dynamic phase shifter");
+
 localparam CNT_W = $clog2(DENOM_1)+1;
 
 logic [CNT_W-1:0] cnt_reg = '0;