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Isochronous data block (isodb) packets – Teledyne LeCroy FireInspector - Users Manual User Manual

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Cycle Start (CycleSt) Packets

Packet rows for cycle start packets contain these fields in addition to the general packet
display elements listed on page 50:

• Transaction labels (lbl)

This value is taken from the packet’s tl field. The label is dis-

played in the bottom half of the field that contains the transaction code.

• Destination_IDs (dest_ID)

The value of the packet’s destination_ID field.

• Source_IDs (src_ID)

The value of the packet’s source_ID field.

• Destination_offsets (dest_offset)

The value of the packet’s destination_offset field.

Not present in response packets.

• Quadlet data (quadlet_data)

The value of the packet’s quadlet_data field.

• Header CRCs (header_CRC)

The value of the packet’s header_CRC field.

• User Data

The value in this field represents the state of the breakout board signals.

Present only when the option “Save External Interface Signals” is selected on the Gen-
eral tab of the Recording Options dialog.

• Idle times (Idle)

The Idle field displays the time between the end of the packet and the

beginning of the next packet.

Hide or Show Cycle Start Packets

Cycle Start packets can easily be hidden or shown by pressing the Hide Cycle Starts

button on the Frequently Used toolbar.

Isochronous Data Block (IsoDB) Packets

Packet rows for isochronous data blocks contain these fields in addition to the general
packet display elements listed on page 50:

• Channel Number (ch)

The value of the packet’s channel field. The channel number is

displayed in the bottom half of the field that contains the transaction code.

• Synchronization code (sy)

The value of the packet’s sy field.

• Data Length (data_len)

The value of the packet’s data_length field.

• Header CRC (header_CRC)

The value of the packet’s header_CRC field.

• Data Block Payload (Data)

The Data field can be expanded and collapsed. By default,

it is collapsed, and the value shown is the number of quadlets contained in the packet’s
data block field. When expanded, the actual quadlet data from the data block field is
shown.

• Data Block CRC (data_CRC)

The value of the packet’s data_CRC field.

• User Data

The value in this field represents the state of the breakout board signals.

Present only when the option “Save External Interface Signals” is selected on the Gen-
eral tab of the Recording Options dialog.

• Idle times (Idle)

The Idle field displays the time between the end of the packet and the

beginning of the next packet.