Teledyne-lecroy UWBTrainer Exerciser Script Language Bedienungsanleitung PDF herunterladen (Seite 95)

LeCroy Corporation UWBTrainer Exerciser - Generation Script Language Reference Manual

10.11 Sizeof Operators

Several kinds of sizeof operators are currently supported:

• fld_size (field_name): Returns the length of the field in bits.

• pkt_size (template): Returns the length of the template payload in bits.

• pkt_size ($pkt_var_name): Returns the length of the structure variable payload in bits.

• pttn_size (data_pattern): Returns the length of the data pattern payload in bits.

Note: Fields that are not initialized with a variable length (declared as

f : *) have 0 length.

Examples

Main

{

# Examples of using 'sizeof' operators.

# Declare a 'structure' instance based on the template S1.

$S = S1

# Declare a 'structure' instance based on the template S2,

# changing the default value for the S16 field.

$W = S2 { S16 = 2 }

Send TX_FRAME

{

# Set the Len to the size of

# combined payload + the size of the 'Len' field.

Len = ( fld_size( Len ) + pkt_size( $S ) + pkt_size( $W ) ) / 8

# Same as the previous assignment.

Len = ( fld_size( Len ) + pkt_size( S1 ) + pkt_size( S2 ) ) / 8

# Data field contains combined payload of structures S and W.

Data = $S + $W

}

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Teledyne-lecroy UWBTrainer Exerciser Script Language Bedienungsanleitung Seite 95