eFEX firmware  1.7.3
ATLAS l1-calo - electron and tau feature extraction firmware for eFEX boards

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pll_selector.vhd
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1 
6 
7 library IEEE;
8 use IEEE.STD_LOGIC_1164.ALL;
10 entity pll_selector is
11  Port (
13  sel : in STD_LOGIC_VECTOR (1 downto 0);
15  pll_en_1 : out STD_LOGIC;
17  pll_en_3 : out STD_LOGIC;
19  pll_en : in STD_LOGIC);
20 end pll_selector;
22 architecture Behavioral of pll_selector is
23 
24 begin
25 
26  pll_en_1 <= pll_en when sel = "00" else '1';
27  pll_en_3 <= pll_en when sel = "10" else '1';
28 
29 end Behavioral;
PLL enable for the control FPGA.
PLL enable for the control FPGA.
in sel STD_LOGIC_VECTOR( 1 downto 0)
selector bits
out pll_en_1 STD_LOGIC
enable pll 1
in pll_en STD_LOGIC
pll enable
out pll_en_3 STD_LOGIC
enable pll 3