Update carrier nco comments to fit SiGE 4162 in realmode

kristianpaul · Jul 18, 2011 · 88550b7 · 88550b7
1 parent 59f99c8
commit 88550b7
Showing 1 changed file with 6 additions and 6 deletions.
diff --git a/cores/namuru/rtl/namuru_carrier_nco.v b/cores/namuru/rtl/namuru_carrier_nco.v
@@ -14,7 +14,7 @@
                     f = fControl * Clk / 2^N
                  where:
                  f = the required carrier wave frequency
-                 Clk = the system clock (= 40MHz)
+                 Clk = the system clock (= 16.384 MHz)
                  N = 30 (bit width of the phase accumulator)
                  fControl = the 30 bit (unsigned) control word 
  
@@ -25,15 +25,15 @@
                         Q: +2 +2 +1 -1 -2 -2 -1 +1
 
                  The nominal center frequency for the GP2015 is:
-                 IF = 1.405396825MHz
-                 Clk = 40 MHz
+                 IF = 2.556 MHz
+                 Clk = 16.384  MHz
                  fControl = 2^N * IF / Clk
-                 fControl = 0x23FA689 for center frequency
+                 fControl = 0x9F0000 for center frequency
 
                  Resolution:
-                 fControl increment value = 0.037252902 Hz
+                 fControl increment value = 0.167510016 Hz
                  Put another way:
-                 37mHz is the smallest change in carrier frequency possible
+                 16mHz is the smallest change in carrier frequency possible
                  with this NCO.
  
                  The carrier phase and carrier cycle count are latched into