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Sync_FF permit to synchronize a signal A in the clock domain clk. Normally, the A signal must be the output of a FF cloked in an other domain. You shouldtn't have "logic" between the 2 domain.
You can configure the FF number (default 2). This number is depending of the MTBF(Mean Time Between Failure).

p=. !{width: 15%}SYNC_FF.png!

COMPONENT SYNC_FF_LPP_JCP
GENERIC (
NB_FF_OF_SYNC : INTEGER);
PORT (
clk : IN STD_LOGIC;
rstn : IN STD_LOGIC;
A : IN STD_LOGIC;
A_sync : OUT STD_LOGIC);
END COMPONENT;

|.Parameter |.Type |.Size |.Description |.Default |
|NB_FF_OF_SYNC |Integer | |Number of FF |2 |
|\5.|
|.Signal |.Direction |.Size |.Function |. Active |
|clk |input |1 |clock |rising edge |
|rstn |input |1 |reset |low |
|A |input |1 |data in | |
|A_sync |ouput |1 |data out synchronized | |

SYNC_VALID_BIT permit to synchronize a signal sin from clock domain clk_in in clock domain clk_out. The sin signal is clocked with one FF in clk_in domain and NB_FF_OF_SYNC in clk_out domain.
You can configure the FF number (default 2). This number is depending of the MTBF(Mean Time Between Failure).

p=. !{width: 20%}SYNC_VALID_BIT.png!

COMPONENT SYNC_VALID_BIT_LPP_JCP
GENERIC (
NB_FF_OF_SYNC : INTEGER);
PORT (
clk_in : IN STD_LOGIC;
clk_out : IN STD_LOGIC;
rstn : IN STD_LOGIC;
sin : IN STD_LOGIC;
sout : OUT STD_LOGIC);
END COMPONENT;

|.Parameter |.Type |.Size |.Description |.Default |
|NB_FF_OF_SYNC |Integer | |Number of FF |2 |
|\5.|
|.Signal |.Direction |.Size |.Function |. Active |
|clk_in |input |1 |clock domain 1 |rising edge |
|clk_out |input |1 |clock domain 1 |rising edge |
|rstn |input |1 |reset |low |
|sin |input |1 |data clocked in domain 1| |
|A_sync |ouput |1 |data clocked in domain 2| |