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Cleaned up counter

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-Not functional
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Andreas.Olofsson 2020-04-22 23:15:12 -04:00
parent d8d2d0c20e
commit a7870ac9de
1 changed files with 24 additions and 47 deletions
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71
common/hdl/oh_counter.v
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@ -1,68 +1,45 @@
//#############################################################################
//# Function: Binary to gray encoder #
//# Function: Generic counter #
//#############################################################################
//# Author: Andreas Olofsson #
//# License: MIT (see LICENSE file in OH! repository) #
//#############################################################################
module oh_counter #(parameter DW = 32, // width of data inputs
parameter TYPE = "INCREMENT" // also DECREMENT, GRAY, LFSR
module oh_counter #(parameter DW = 32 // width of data inputs
)
(
input clk, // clk input
input in, // input to count
input en, // enable counter
input load, // load counter
input [DW-1:0] load_data,// load data
output [DW-1:0] count, // current count value
output carry, // carry out from counter
output zero // counter is zero
//inputs
input clk, // clk input
input in, // input to count
input en, // enable counter
input dir,//0=increment, 1=decrement
input autowrap, //auto wrap around
input load, // load counter
input [DW-1:0] load_data, // input data to load
//outputs
output [DW-1:0] count, // count value
output wraparund // wraparound indicator
);
// local variables
reg [DW-1:0] count;
reg carry;
wire [DW-1:0] count_in;
wire carry_in;
// configure counter based on type
generate
if(TYPE=="INCREMENT")
begin
assign {carry_in,count_in[DW-1:0]} = count[DW-1:0] + in;
end
else if(TYPE=="DECREMENT")
begin
assign count_in[DW-1:0] = count[DW-1:0] + in;
end
else if (TYPE=="GRAY")
begin
initial
$display ("NOT IMPLEMENTED");
end
else if (TYPE=="LFSR")
begin
initial
$display ("NOT IMPLEMENTED");
end
endgenerate
//Select count direction
assign count_in[DW-1:0] = dir ? count[DW-1:0] - in :
count[DW-1:0] + in ;
// counter
always @(posedge clk)
if(load)
begin
carry <= 1'b0;
count[DW-1:0] <= load_data[DW-1:0];
end
else if (en)
begin
carry <= carry_in;
count[DW-1:0] <= count_in[DW-1:0];
end
count[DW-1:0] <= load_data[DW-1:0];
else if (en & ~(wraparound & ~autowrap))
count[DW-1:0] <= count_in[DW-1:0];
// counter expired
assign zero = ~(count[DW-1:0]);
assign wraparound = (dir & en & ~(|count[DW-1:0])) |
(~dir & en & (&count[DW-1:0]));
endmodule // oh_counter