phy/usp_gth/gty_1000basex: Add refclk_from_fabric parameter to allow …

…selecting GTGREFCLK or GTREFCLK0.
enjoy-digital · Nov 25, 2024 · 99d4073 · 99d4073
1 parent 17f80af
commit 99d4073
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Showing 3 changed files with 7 additions and 6 deletions.
diff --git a/liteeth/gen.py b/liteeth/gen.py
@@ -362,6 +362,7 @@ def __init__(self, platform, core_config):
                     # Clocking.
                     refclk_or_clk_pads = ethphy_pads.refclk,
                     refclk_freq        = core_config.get("refclk_freq", 200e6),
+                    refclk_from_fabric = core_config.get("refclk_from_fabric", True),
                     # TX.
                     tx_polarity        = core_config.get("phy_tx_polarity", 0),
                     # RX.

diff --git a/liteeth/phy/usp_gth_1000basex.py b/liteeth/phy/usp_gth_1000basex.py
@@ -22,7 +22,7 @@ class USP_GTH_1000BASEX(LiteXModule):
     linerate    = 1.25e9
     rx_clk_freq = 125e6
     tx_clk_freq = 125e6
-    def __init__(self, refclk_or_clk_pads, data_pads, sys_clk_freq, refclk_freq=200e6, with_csr=True, rx_polarity=0, tx_polarity=0):
+    def __init__(self, refclk_or_clk_pads, data_pads, sys_clk_freq, refclk_freq=200e6, with_csr=True, rx_polarity=0, tx_polarity=0, refclk_from_fabric=False):
         from liteiclink.serdes.gth4_ultrascale import GTHChannelPLL
         assert refclk_freq in [200e6, 156.25e6]
         self.pcs = pcs = PCS(lsb_first=True)
@@ -579,12 +579,12 @@ def __init__(self, refclk_or_clk_pads, data_pads, sys_clk_freq, refclk_freq=200e
             i_DRPWE               = 0b0,
             i_EYESCANRESET        = 0b0,
             i_EYESCANTRIGGER      = 0b0,
-            i_GTGREFCLK           = refclk,
+            i_GTGREFCLK           = refclk if refclk_from_fabric else 0b0,
             i_GTHRXN              = data_pads.rxn,
             i_GTHRXP              = data_pads.rxp,
             i_GTNORTHREFCLK0      = 0b0,
             i_GTNORTHREFCLK1      = 0b0,
-            i_GTREFCLK0           = 0b0,
+            i_GTREFCLK0           = refclk if not refclk_from_fabric else 0b0,
             i_GTREFCLK1           = 0b0,
             i_GTRSVD              = 0b0000000000000000,
             i_GTRXRESET           = rx_reset,

diff --git a/liteeth/phy/usp_gty_1000basex.py b/liteeth/phy/usp_gty_1000basex.py
@@ -22,7 +22,7 @@ class USP_GTY_1000BASEX(LiteXModule):
     linerate    = 1.25e9
     rx_clk_freq = 125e6
     tx_clk_freq = 125e6
-    def __init__(self, refclk_or_clk_pads, data_pads, sys_clk_freq, refclk_freq=200e6, with_csr=True, rx_polarity=0, tx_polarity=0):
+    def __init__(self, refclk_or_clk_pads, data_pads, sys_clk_freq, refclk_freq=200e6, with_csr=True, rx_polarity=0, tx_polarity=0, refclk_from_fabric=False):
         from liteiclink.serdes.gty_ultrascale import GTYChannelPLL
         assert refclk_freq in [200e6, 156.25e6]
         self.pcs = pcs = PCS(lsb_first=True)
@@ -599,10 +599,10 @@ def __init__(self, refclk_or_clk_pads, data_pads, sys_clk_freq, refclk_freq=200e
             i_EYESCANRESET        = 0b0,
             i_EYESCANTRIGGER      = 0b0,
             i_FREQOS              = 0b0,
-            i_GTGREFCLK           = refclk,
+            i_GTGREFCLK           = refclk if refclk_from_fabric else 0b0,
             i_GTNORTHREFCLK0      = 0b0,
             i_GTNORTHREFCLK1      = 0b0,
-            i_GTREFCLK0           = 0b0,
+            i_GTREFCLK0           = refclk if not refclk_from_fabric else 0b0,
             i_GTREFCLK1           = 0b0,
             i_GTRSVD              = 0b0,
             i_GTRXRESET           = rx_reset,