Hi everyone,
I am having a strange problem with making my code generic.
I'll try to explain this complex problem as good as possible. I am coding the
protocols between an SDRAM controller and a number of clients
part of my code looks like this:
when "100101111" => clientcyc(0) <= "0000";
when "100110000" => clientcyc(1) <= "0001";
when "100110001" => clientcyc(2) <= "0010";
where clientcyc is a register which stores the number assigned to each client in each of it's array elements. Each client can communicate with a fifo in the RAM-controller which is done by mapping through a multiplexer.
For the multiplexer the control input is the number assigned to each client.
for eg, i looks like
multiplexer_2 : process (clk)
begin
if rising_edge(clk)then
port_sig <= clientcyc (x)
case port_sig is
when "0001" => tx_empty <= wr_fifo_empty(0);
wr_fifo_rd_en(0) <= tx_ren;
DI_tx <= wr_fifo_dout(0);
rd_fifo_rd_en (0) <= rx_ren;
rx_empty <= rd_fifo_empty(0);
rx_full <= rd_fifo_full(0);
data_rdy(0) <= di_ready;
when "0010" => tx_empty <= wr_fifo_empty(1);
wr_fifo_rd_en(1) <= tx_ren;
DI_tx <= wr_fifo_dout(1);
rd_fifo_rd_en (1) <= rx_ren;
rx_empty <= rd_fifo_empty(1);
rx_full <= rd_fifo_full(1);
data_rdy(1) <= di_ready;
so for each client number(for eg case "0001" corresponds to a client and "0010" to another) tx_ren ,rx_ren , rx_empty,rx_full etc. signals are mapped to the inputs and outputs of a fifo. The problem with this mapping technique
is I cannot make it generic for any number of clients. Is there any method by which such mapping client and fifos can be done in a generic way. The fifos are generated in Xilinx ISE using the generate statement which is like this
for i in 0 to (gClients - 1) generate
tx_fifo : wr_fifo
port map (
din => DI_in(((i+1)*17-1) downto i*17),
rd_clk => clk_a,
rd_en => wr_fifo_rd_en(i),
rst => rst,
wr_clk => clk,
wr_en => wr_en(i),
dout => wr_fifo_dout(i),
empty => wr_fifo_empty(i),
full => wr_fifo_full(i));
end generate;
where gClients is the number of clients.
Any kind of suggestions would be beneficial. And if somebody has any further queries please ask me
I am having a strange problem with making my code generic.
I'll try to explain this complex problem as good as possible. I am coding the
protocols between an SDRAM controller and a number of clients
part of my code looks like this:
when "100101111" => clientcyc(0) <= "0000";
when "100110000" => clientcyc(1) <= "0001";
when "100110001" => clientcyc(2) <= "0010";
where clientcyc is a register which stores the number assigned to each client in each of it's array elements. Each client can communicate with a fifo in the RAM-controller which is done by mapping through a multiplexer.
For the multiplexer the control input is the number assigned to each client.
for eg, i looks like
multiplexer_2 : process (clk)
begin
if rising_edge(clk)then
port_sig <= clientcyc (x)
case port_sig is
when "0001" => tx_empty <= wr_fifo_empty(0);
wr_fifo_rd_en(0) <= tx_ren;
DI_tx <= wr_fifo_dout(0);
rd_fifo_rd_en (0) <= rx_ren;
rx_empty <= rd_fifo_empty(0);
rx_full <= rd_fifo_full(0);
data_rdy(0) <= di_ready;
when "0010" => tx_empty <= wr_fifo_empty(1);
wr_fifo_rd_en(1) <= tx_ren;
DI_tx <= wr_fifo_dout(1);
rd_fifo_rd_en (1) <= rx_ren;
rx_empty <= rd_fifo_empty(1);
rx_full <= rd_fifo_full(1);
data_rdy(1) <= di_ready;
so for each client number(for eg case "0001" corresponds to a client and "0010" to another) tx_ren ,rx_ren , rx_empty,rx_full etc. signals are mapped to the inputs and outputs of a fifo. The problem with this mapping technique
is I cannot make it generic for any number of clients. Is there any method by which such mapping client and fifos can be done in a generic way. The fifos are generated in Xilinx ISE using the generate statement which is like this
for i in 0 to (gClients - 1) generate
tx_fifo : wr_fifo
port map (
din => DI_in(((i+1)*17-1) downto i*17),
rd_clk => clk_a,
rd_en => wr_fifo_rd_en(i),
rst => rst,
wr_clk => clk,
wr_en => wr_en(i),
dout => wr_fifo_dout(i),
empty => wr_fifo_empty(i),
full => wr_fifo_full(i));
end generate;
where gClients is the number of clients.
Any kind of suggestions would be beneficial. And if somebody has any further queries please ask me