Teledyne-lecroy USB File Based Decode Manual Manual de usuario descargar pdf (Pagina 11)

COMPUTER ACCESS TECHNOLOGY CORPORATION USB REQUEST DEFINITION (.REQ) FILES

Reference Manual

Decoding Definition strings: wValue, wIndex, and Data

A request definition may contain three optional decoding definition strings:

wValue, wIndex, and Data. wValue and wIndex define how the wValue and

wIndex fields of the request are decoded. Data specifies how Data fields are

decoded during the request's data stage. All three use the same definition format, as

follows:

<wValue, wIndex or Data>=

{

...

}

If one or more of the definition strings is omitted, then the Request Decoding

applies default decoding.

The contents of the decoding definitions can be built using one or more of these

three basic keywords: WordValue, FormatValue, and Bitmap.

WordValue

Use the WordValue keyword when the field has a defined set of possible values,

and each value has a different meaning. The entries are formatted as an enumerated

list, as follows:

WordValue=

{

<wValue_0>=<Value_Meaning_0>

<wValue_1>=<Value_Meaning_1>

...

}

The possible values for wValue are represented numerically. The meanings are

generally represented as text strings. WordValue entries work similarly to if-then

statements: if wValue matches a wValue value in the WordValue list, then the

meaning will appear in the wValue trace field. If the value of wValue doesn't

match a value in the list, then, by default, its numeric value will be displayed in the

wValue trace field. However, this default can also be overridden with a different

type of decoding -- a FormatValue entry (see “FormatValue” on page 8 for

details) or a Bitmap entry (see “Bitmap” on page 11 for more details).

The following example comes from the wValue entry of the hub.req

SetFeature request definition. The figure shows the output that results when

wValue is 0x0008.

WordValue={

0x0001=PORT_ENABLE

0x0002=PORT_SUSPEND

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 35 36

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Teledyne-lecroy USB File Based Decode Manual Manual de usuario Pagina 11