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--- en:xu4_hdmiphy_configuration [2015/08/12 14:25]
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+++ en:xu4_hdmiphy_configuration [2015/08/12 14:26] (current)
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@@ Line 1: / Line 1: @@
+If your HDMI TV or monitor is too sensitive and doesn't display correctly, it is worth to adjust the HDMI PHY on the XU3/XU4.\\
+To use this feature, the Kernel version must be be 3.10.82-47 or higher.
+**This is a portion of the default boot.ini file comes with the 3.10.82-47 update.**
+<code>
+#------------------------------------------------------------------------------
+#
+# HDMI-PHY Parameter Control
+#
+#------------------------------------------------------------------------------
+#------------------------------------------------------------------------------
+#
+#  TMDS data amplitude control.
+#
+#------------------------------------------------------------------------------
+#
+#  1LSB corresponds to 20 mVdiff amplitude level.
+#  tx_amp_lvl : 0 = 760 mVdiff(Min), 31 = 1380 mVdiff(Max)
+#
+#  Hardkernel default hdmi_tx_amp_lvl = 31(1380 mVdiff);
+#------------------------------------------------------------------------------
+setenv hdmi_tx_amp_lvl  "31"
+#------------------------------------------------------------------------------
+#
+#  TMDS data amplitude fine control for each channel.
+#
+#------------------------------------------------------------------------------
+#
+#  1LSB corresponds to 20 mVdiff amplitude level.
+#  tx_lvl : 0 = 0 mVdiff(Min), 3 = 60 mVdiff(Max)
+#
+#  Hardkernel default
+#      hdmi_tx_lvl_ch0 = 3, hdmi_tx_lvl_ch1 = 3, hdmi_tx_lvl_ch2 = 3,
+#------------------------------------------------------------------------------
+setenv hdmi_tx_lvl_ch0      "3"
+setenv hdmi_tx_lvl_ch1      "3"
+setenv hdmi_tx_lvl_ch2      "3"
+#------------------------------------------------------------------------------
+#
+#  TMDS data pre-emphasis level control.
+#
+#------------------------------------------------------------------------------
+#
+#  1LSB corresponds to -0.45dB emphasis level except for 1
+#  tx_emp_lvl : 0 = 0 db(Min), 1 = -0.25 db, 2 = 0.7 db, 15 = -7.45 db(Max)
+#
+#  Hardkernel default hdmi_tx_emp_lvl = 6 (-2.50 db);
+#------------------------------------------------------------------------------
+setenv hdmi_tx_emp_lvl      "6"
+#------------------------------------------------------------------------------
+#
+#  TMDS clock amplitude control.
+#
+#------------------------------------------------------------------------------
+#
+#  1LSB corresponds to 20 mVdiff amplitude level.
+#  clk_amp_lvl : 0 = 790 mVdiff(Min), 31 = 1410 mVdiff(Max)
+#
+#  Hardkernel default hdmi_clk_amp_lvl = 31 (1410 mVdiff)
+#------------------------------------------------------------------------------
+setenv hdmi_clk_amp_lvl     "31"
+#------------------------------------------------------------------------------
+#
+#  TMDS data source termination resistor control.
+#
+#------------------------------------------------------------------------------
+#
+#  tx_res :
+#      0 = Source Termination OFF(Min), 1 = 200 ohm, 2 = 300 ohm, 3 = 120 ohm(Max)
+#
+#  Hardkernrel default hdmi_tx_res = 0 (Source Termination OFF)
+#------------------------------------------------------------------------------
+setenv hdmi_tx_res      "0"
+</code>
+**If you have a display compatibility issue by HDMI signal strength, try this parameters.**
+<code>
+#------------------------------------------------------------------------------
+#
+# HDMI-PHY Parameter Control
+#
+#------------------------------------------------------------------------------
+#------------------------------------------------------------------------------
+#
+#  TMDS data amplitude control.
+#
+#------------------------------------------------------------------------------
+#
+#  1LSB corresponds to 20 mVdiff amplitude level.
+#  tx_amp_lvl : 0 = 760 mVdiff(Min), 31 = 1380 mVdiff(Max)
+#
+#  Hardkernel default hdmi_tx_amp_lvl = 31(1380 mVdiff);
+#------------------------------------------------------------------------------
+# trial hdmi_tx_amp_lvl = 13(1020 mVdiff);
+setenv hdmi_tx_amp_lvl  "13"
+#------------------------------------------------------------------------------
+#
+#  TMDS data amplitude fine control for each channel.
+#
+#------------------------------------------------------------------------------
+#
+#  1LSB corresponds to 20 mVdiff amplitude level.
+#  tx_lvl : 0 = 0 mVdiff(Min), 3 = 60 mVdiff(Max)
+#
+#  Hardkernel default
+#      hdmi_tx_lvl_ch0 = 3, hdmi_tx_lvl_ch1 = 3, hdmi_tx_lvl_ch2 = 3,
+#------------------------------------------------------------------------------
+setenv hdmi_tx_lvl_ch0      "0"
+setenv hdmi_tx_lvl_ch1      "0"
+setenv hdmi_tx_lvl_ch2      "0"
+#or try below parameters
+#setenv hdmi_tx_lvl_ch0      "1"
+#setenv hdmi_tx_lvl_ch1      "1"
+#setenv hdmi_tx_lvl_ch2      "1"
+#------------------------------------------------------------------------------
+#
+#  TMDS data pre-emphasis level control.
+#
+#------------------------------------------------------------------------------
+#
+#  1LSB corresponds to -0.45dB emphasis level except for 1
+#  tx_emp_lvl : 0 = 0 db(Min), 1 = -0.25 db, 2 = 0.7 db, 15 = -7.45 db(Max)
+#
+#  Hardkernel default hdmi_tx_emp_lvl = 6 (-2.50 db);
+#------------------------------------------------------------------------------
+setenv hdmi_tx_emp_lvl      "6"
+#------------------------------------------------------------------------------
+#
+#  TMDS clock amplitude control.
+#
+#------------------------------------------------------------------------------
+#
+#  1LSB corresponds to 20 mVdiff amplitude level.
+#  clk_amp_lvl : 0 = 790 mVdiff(Min), 31 = 1410 mVdiff(Max)
+#
+#  Hardkernel default hdmi_clk_amp_lvl = 31 (1410 mVdiff)
+#------------------------------------------------------------------------------
+# hdmi_clk_amp_lvl = 16 (1110 mVdiff)
+setenv hdmi_clk_amp_lvl     "16"
+#------------------------------------------------------------------------------
+#
+#  TMDS data source termination resistor control.
+#
+#------------------------------------------------------------------------------
+#
+#  tx_res :
+#      0 = Source Termination OFF(Min), 1 = 200 ohm, 2 = 300 ohm, 3 = 120 ohm(Max)
+#
+#  Hardkernrel default hdmi_tx_res = 0 (Source Termination OFF)
+#------------------------------------------------------------------------------
+# 200ohm termination
+setenv hdmi_tx_res      "1"
+#------------------------------------------------------------------------------
+</code>