Teledyne-lecroy Voyager Exerciser Generation Script Language Manua Manual de usuario descargar pdf (Pagina 118)

Teledyne LeCroy Voyager USB 3.0 Exerciser Generation Script Language Reference Manual

109

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_PACKET

{

# 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 Voyager Exerciser Generation Script Language Manua Manual de usuario Pagina 118