Implementation Specific Features

unsized constant number

minimum of 32 bits

32 bits

64 bits for 64-bit compilers

integer

minimum of 32 bits

32 bits

64 bits for 64-bit compilers

x/z extension of msb of unsized constant

different between '95 and '01 specs

follows 2001 spec

x/z bit value is extended to the size of expression

maximum array dimensions

unknown (>=1)

15

array size

minimum of 2^24 (16777216)

2^24

vector size

minimum of 2^16 (65536)

2^24 (maximum)

Each CvSDL library release may limit the actual vector size. See the latest release notes.

timing control:
repeat (expr) event_control statement_or_null
vs.
loop: repeat (expr) statement

ambiguous

repeat is always interpreted as a loop statement, i.e. CvSDL uses the second rule

#delay_value unsized_constant

ambiguous

hdl2cvsdl flags this as an error

e.g. addr=#1 'hx;
fix:
addr=#(1) 'hx; // or
addr=#1 30'hx;

maximum replication count in concatenation

unknown (>=1)

256

Non-standard system tasks supported

Appendix C, IEEE 1364-2001

$log
$nolog
$reset
$reset_count
$reset_value

module_parameter_port_list

E.g. per rule, #(parameter a=3, b=4;, parameter c=5;)

Assume #(parameter a=3,b=4, parameter c=5)

It appears there is something wrong with the rule.

Concatenation of Real Data

concatenated real variables allowed as lvalue in procedural assignment

unpredictable result

{} and {{}} not allowed for real types

tri-state drivers as lvalues in always blocks

appears in IEEE1364.1

unpredictable result

seem to contradict IEEE1364

thread stack size

-

default value of 0x80000 bytes

This can be changed globally or per-thread