From f4e9affa08efc13dc8cf2fe3a67a8ca7400903e0 Mon Sep 17 00:00:00 2001 From: Dobrica Pavlinusic Date: Sun, 2 Jan 2022 14:38:55 +0100 Subject: [PATCH] better describe LTC2226CUH 12 bits --- trilby.lpf | 34 +++++++++++++++++++--------------- 1 file changed, 19 insertions(+), 15 deletions(-) diff --git a/trilby.lpf b/trilby.lpf index 1f77299..6c14b21 100644 --- a/trilby.lpf +++ b/trilby.lpf @@ -17,21 +17,25 @@ FREQUENCY PORT "clk" 24 MHZ; # LTC2226CUH - in # 12bit, 25Msps, 3V ADC # clk - 24mhz tcxo - -LOCATE COMP "a2dq0" SITE "D12"; # D0 -- not used (noise?), from schematic -LOCATE COMP "a2dq1" SITE "C12"; # D1 -- not used -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"; -LOCATE COMP "a2dq10" SITE "C17"; -LOCATE COMP "a2dq11" SITE "A18"; -LOCATE COMP "a2dq12" SITE "A19"; -LOCATE COMP "a2dq13" SITE "B19"; +# +# 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 -- 2.20.1