User's Manual

Table Of Contents

CATC MERLIN MOBILE 1.00 CHAPTER 7

User’s Manual Decoding Trace Data

DRAFT

• 010 = Optional scan mode II

• 011 = Optional scan mode III

• 100, 101, 110, 111 = reserved

• Cyclical redundancy check (CRC): The CRC code in the payload.

Acknowledge Status Block

The acknowledge status block indicates whether the payload data of the current packet was

successfully transferred to the target device.

• Acknowledge status (Ack’d): The value of the ARQN field of the next packet with the

same AM_ADDR as the current packet. Possible values:

• Yes = positive acknowledge (ACK)

• No = negative acknowledge (explicit NAK)

• Imp Nak = implicit NAK (acknowledge status not returned by target)

• Unknown = unable to determine acknowledge status

Idle Time and Time Stamp Block

The idle time and time stamp block provides timing information from the Merlin Mobile

analyzer’s internal clock.

• Idle time (Idle): The Idle field displays the time, in microseconds, between the end of

the packet and the beginning of the next packet.

• Time stamp (Time Stamp): Packets are timestamped to an accuracy of 100 nanoseconds.

Time stamps are formatted as Seconds.Milliseconds Microseconds*10. You can find the

elapsed time between two packets by calculating the difference between their Time

Stamp values. The Time Stamp field occurs last in the packet row.

7.1.3 Miscellaneous Packet Display Elements

These elements may be found in the display for any type of packet:

• Trigger location (if applicable): Merlin Mobile auto-

matically indicates the trigger position in a Trace file

with a red marker bar on the left edge of the number

field of the trigger packet. The marker can be edited or

removed, just like any other marker in a Trace file. The packet number field colors can

be set so that the pre- and post-trigger packets are different colors, making them easily

distinguishable.

Figure 7-2: Trigger packet