Vivado synthesis supports system tasks or function as shown in the following table. Vivado synthesis ignores unsupported system tasks.
Table 7-5: System Tasks and Status
|
System Task or Function
|
Status
|
Comment
|
|
$display
|
Limited Supported
|
|
|
$fclose
|
Not Supported
|
|
|
$fdisplay
|
Ignored
|
|
|
$fgets
|
Not Supported
|
|
|
$finish
|
Ignored
|
|
|
$fopen
|
Ignored
|
|
|
$fscanf
|
Ignored
|
Escape sequences are limited to %b and %d
|
|
$fwrite
|
Ignored
|
|
|
$monitor
|
Ignored
|
|
|
$random
|
Ignored
|
|
|
$readmemb
|
Supported
|
|
|
$readmemh
|
Supported
|
|
|
$signed
|
Supported
|
|
|
$stop
|
Ignored
|
|
|
$strobe
|
Ignored
|
|
|
$time
|
Ignored
|
|
|
$unsigned
|
Supported
|
|
|
$write
|
Not Supported
|
|
|
$clog2
|
Supported
|
This is supported with SystemVerilog only.
|
|
$floor
|
Limited Support
|
For parameters only.
|
|
$ceil
|
Limited Support
|
For parameters only.
|
|
$rtoi
|
Supported
|
|
|
$itor
|
Supported
|
|
|
$bits
|
Supported
|
|
|
$bitstoreal
|
Supported
|
|
|
$realtobits
|
Supported
|
|
|
$bitstoshortreal
|
Supported
|
|
|
$shortrealtobits
|
Supported
|
|
|
$unpacked_dimensions
|
Supported
|
|
|
$dimensions
|
Supported
|
|
|
$left
|
Supported
|
|
|
$right
|
Supported
|
|
|
$low
|
Supported
|
|
|
$high
|
Supported
|
|
|
$increment
|
Supported
|
|
|
$size
|
Supported
|
|
|
$countones
|
Supported
|
|
|
$countbits
|
Supported
|
|
|
$onehot
|
Supported
|
|
|
$onehot0
|
Supported
|
|
|
$isunknown
|
Supported
|
|
|
$asin
|
Supported
|
|
|
$acos
|
Supported
|
|
|
$atan
|
Supported
|
|
|
$atan2
|
Supported
|
|
|
$sinh
|
Supported
|
|
|
$cosh
|
Supported
|
|
|
$tanh
|
Supported
|
|
|
$sin
|
Supported
|
|
|
$asinh
|
Supported
|
|
|
$cos
|
Supported
|
|
|
$ascosh
|
Supported
|
|
|
$tan
|
Supported
|
|
|
$ln
|
Supported
|
|
|
$atanh
|
Supported
|
|
|
$log10
|
Supported
|
|
|
$exp
|
Supported
|
|
|
$sqrt
|
Supported
|
|
|
$hypot
|
Supported
|
|
|
$pow
|
Supported
|
|
|
$fatal
|
Supported
|
|
|
$warning
|
Supported
|
|
|
$error
|
Supported
|
|
|
$info
|
Supported
|
|
|
all others
|
Ignored
|
|