hi i posted the following already in comp.lang.vhdl but perhaps somebody can help me here:
i created a lookup Table:
type SBOX_TYPE is array ( 0 to 255) of std_logic_vector(7 downto 0);
constant SBOX_Table: SBOX_TYPE := ( ........ );
in my actual code i have a state machine with different states. i have
4 states (sub0 to sub3) in which i call SBOX_TABLE.these states can never be acticve at the same time.if s_State_Sub0 = '1' then v_Word(0)
Have read the answers with attention ?
"Define SBOX as a separate entity with an address input port and a data
output port. then in your state machine, assign values to the address variable. this way your tool will be able to generate a mux for the address and you'll need only one copy of the SBOX. "
That is a possible solution.
Rgds Andr=E9
yes i did but that answer was posted after my question here. sorry. thanks for the help!
u snipped-for-privacy@yahoo.de schrieb:
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Hi, since the sources and destinations of the 4 assignments are different the synthesizer infers 4 S-Boxes. The synthesizer doesn't have the intelligence to create a multiplexer demultiplexer around the sbox. So try this: in your States: Boxadress
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