Teledyne-lecroy Voyager Exerciser Generation Script Language Manua Manual do Utilizador descarregar pdf (Página 41)

Teledyne LeCroy Voyager USB 3.0 Exerciser Generation Script Language Reference Manual

8.2 Field Definitions

You can define template fields using the following syntax:

Field_Name : [ offset, ] length [ (Byte Order attribute) ] [ = Field_Value ] [ [ list of possible values ] ]

Field_Name [: length] { Subfield definitions } [ (Byte Order attribute) [ = Field_Value ] [ [ list of

possible values ] ]

Note 1: Specify all field offsets and lengths in bits. Numeric expressions with declared constants

are allowed in field offset and length definitions. All field and subfield names must be unique

inside a template.

Note 2: You can define local fields for packet variable instances and when sending a packet. See

sections Changing Structure Parser Variables and Send Packet Instruction for more information.

8.2.1 Defining a Field at a Specific Offset

If the offset parameter is in a field definition, the field is bound to a specific offset.

Examples

const F3_OFFSET = 16

const F3_LEN = 8

# Declare the packet template 'SomeTemplate'.

Packet SomeTemplate

{

F1 : 0, 16 # Declare the 16-bit field 'F1' at offset 0.

F2 : 64, 32 # Declare the 32-bit field 'F2' at offset 64.

F3 : F3_OFFSET, F3_LEN # Declare the 8-bit field 'F2' at offset 16.

F4 : F3_OFFSET + F3_LEN, 16 # Declare the 16-bit field 'F4' at

# offset 16+8.

}

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