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- put general helper functions to utils_pkg

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git-svn-id: http://moon:8086/svn/vhdl/trunk@580 cc03376c-175c-47c8-b038-4cd826a8556b
This commit is contained in:
jens
2009-11-03 20:49:07 +00:00
parent 2894ed417a
commit e0f0157686
1 changed files with 0 additions and 83 deletions
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lib/VGA_ctrl/src/vga_types.vhd
-83
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@@ -123,14 +123,6 @@ package vga_types is
);
-- Functions
function NextPowerOfTwo(x : natural) return natural;
function NextExpBaseTwo(x : natural) return natural;
function GCD(a, b : natural) return natural;
function LCM(a, b : natural) return natural;
function DCM_PERIOD(f_sys_hz : natural) return real;
function DCM_FREQ_M(f_sys_hz, f_vga_hz : natural) return natural;
function DCM_FREQ_D(f_sys_hz, f_vga_hz : natural) return natural;
function to_color_t(x : unsigned) return color_t;
function to_unsigned(x : color_t) return unsigned;
@@ -139,81 +131,6 @@ end vga_types;
package body vga_types is
function NextExpBaseTwo(x : natural) return natural is
begin
return natural(ceil(log2(real(x))));
end NextExpBaseTwo;
function NextPowerOfTwo(x : natural) return natural is
begin
return 2**NextExpBaseTwo(x);
end NextPowerOfTwo;
function GCD(a, b : natural) return natural is
variable aa : natural;
variable bb : natural;
begin
aa := a;
bb := b;
while bb /= 0 loop
if aa > bb then
aa := aa - bb;
else
bb := bb - aa;
end if;
end loop;
return aa;
end GCD;
function LCM(a, b : natural) return natural is
begin
return (a * b)/GCD(a, b);
end LCM;
function DCM_FREQ_M(f_sys_hz, f_vga_hz : natural) return natural is
variable f_sys_mhz : natural;
variable f_vga_mhz : natural;
variable m : natural;
begin
f_sys_mhz := f_sys_hz/1E6;
f_vga_mhz := f_vga_hz/1E6;
m := f_vga_mhz/GCD(f_sys_mhz, f_vga_mhz);
if m = 1 then
m := 2;
end if;
return m;
end DCM_FREQ_M;
function DCM_FREQ_D(f_sys_hz, f_vga_hz : natural) return natural is
variable f_sys_mhz : natural;
variable f_vga_mhz : natural;
variable m : natural;
variable d : natural;
begin
m := DCM_FREQ_M(f_sys_hz, f_vga_hz);
f_sys_mhz := f_sys_hz/1E6;
f_vga_mhz := f_vga_hz/1E6;
d := m*f_sys_mhz/f_vga_mhz;
return d;
end DCM_FREQ_D;
function DCM_PERIOD(f_sys_hz : natural) return real is
begin
return 1.0E9/real(f_sys_hz);
end DCM_PERIOD;
function to_color_t(x : unsigned) return color_t is
variable result : color_t;
begin