Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

vhdl SXT function

Hai all, Can anyone explain the SXT function in vhdl code? For example bp<=SXT(a,9)..I try to study from reference book and find others tutorial, but make me more confuse. Please help me :confu...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Obviously this is only intended for std_logic_vectors that are storing signed values. You'll get odd results on unsigned values.

To make life a little less confusing (ie. not using std_Logic_vectors) I recommend using the numeric_std library where you can use the signed and unsigned types in the same file, and there is a function "resize" that does the same function, but works for both types.