Teledyne LeCroy UWBTrainer Exerciser Script Language - Manual (Page 82)

LeCroy Corporation UWBTrainer Exerciser - Generation Script Language Reference Manual
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10.3 Using Local Fields in Structure Variables
You can declare local fields within a structure variable. Use local fields to reassign bit offsets or
append additional data to a structure variable. These fields are only valid in the structure variable
in which they are declared, not the frame template. You can declare new structure variables
based on the structure variable with local fields. However, it is illegal to assign an existing
structure variable to a structure variable that contains declared local fields. This may or may not
generate parse errors. If no parse errors are generated, the local fields are not in the assigned
structure variable.
Note:
See section “Changing Structure Parser Variables” for more examples.
Example
struct S1
{
F16 : 16 = 0xAABB
F8 : 8 = 0xFE
F32 : 32 = 0xABCD1234
}
Main
{
# Declare a structure variable based on struct S1.
$Pkt_Var1 = S1
# Declare local field F24 in structure variable $Pkt_Var1. The
# local field is from offset 0 and is 24 bits long (it is the same
# offsets as F16 and F8)
$Pkt_Var1
{
F24 : 0 , 24 = { 11 22 33 }
}
# Declare a structure variable based on struct S1.
$Pkt_Var2 = S1
# Declare local field F24 in structure variable $Pkt_Var2. The
# local field is 120 bits long at offset 56 (end of the structure
# variable).
$Pkt_Var2
{
F128 : 120 = { 11 22 33 44 55 66 77 88 99 AA BB CC DD EE FF }
}
# Declare structure variable $Pkt_Var3 (assigned from $Pkt_Var1).
$Pkt_Var3 = $Pkt_Var1
# Declare a structure variable based on struct S1.
$Pkt_Var4 = S1
# Bad assignment $Pkt_Var2 to $Pkt_Var4 (data NOT copied)
$Pkt_Var4 = $Pkt_Var2
}