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Altera_Forum
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15 years ago

counte various value

i have a array with 16 values each with 12 bits i want to count the no of trailingones(1 or -1) maxmim is 3 ,and total no of non zero values and total zeros . i wrote the program ,it compile succe...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

You can't directly compare a std_logic_vector with an integer.

You should use the signed type instead. Either just for vin: 

vin <= signed(memory(i-1));

or also define memory as an array of signed and keep your vin assignment without any cast.

Once vin is an unsigned, you can directly compare it to 0, 1 and -1 in your if statements.

Same thing for your counters, you can't add an integer to them. Either redefine them as integers, or as unsigned.