-LOCATE COMP "a2dq10" SITE "C17"; # in
-LOCATE COMP "a2dq11" SITE "A18";
-LOCATE COMP "a2dq12" SITE "A19";
-LOCATE COMP "a2dq13" SITE "B19";
-LOCATE COMP "a2dq2" SITE "B12";
-LOCATE COMP "a2dq3" SITE "D15";
-LOCATE COMP "a2dq4" SITE "C15";
-LOCATE COMP "a2dq5" SITE "B15";
-LOCATE COMP "a2dq6" SITE "E15";
-LOCATE COMP "a2dq7" SITE "C16";
-LOCATE COMP "a2dq8" SITE "D16";
-LOCATE COMP "a2dq9" SITE "B17";
+
+# LTC2226CUH - in
+# 12bit, 25Msps, 3V ADC
+# clk - 24mhz tcxo
+#
+# schematics implies that ADC has 14 bits, it has only 12
+# my guess it that previous version had 14 bit ADC, so
+# a2dq0 and a2dq1 are not used in original vhdl
+
+LOCATE COMP "a2dq0" SITE "D12"; # -- not used in hdl (12-bit ADC), from schematic
+LOCATE COMP "a2dq1" SITE "C12"; # -- not used
+LOCATE COMP "a2dq2" SITE "B12"; # D0
+LOCATE COMP "a2dq3" SITE "D15"; # D1
+LOCATE COMP "a2dq4" SITE "C15"; # D2
+LOCATE COMP "a2dq5" SITE "B15"; # D3
+LOCATE COMP "a2dq6" SITE "E15"; # D4
+LOCATE COMP "a2dq7" SITE "C16"; # D5
+LOCATE COMP "a2dq8" SITE "D16"; # D6
+LOCATE COMP "a2dq9" SITE "B17"; # D7
+LOCATE COMP "a2dq10" SITE "C17"; # D8
+LOCATE COMP "a2dq11" SITE "A18"; # D9
+LOCATE COMP "a2dq12" SITE "A19"; # D10
+LOCATE COMP "a2dq13" SITE "B19"; # D11 MSB
+
+LOCATE COMP "a2d_of" SITE "B20"; # over/under flow
+
+