Specifications

90 System Software Diagnostics Guide — September 2006
GCEV_TRACEDATA Reference
Following are descriptions of the fields listed in Table 1:
Data Type
This field describes the type of data in the payload following it. At this time, the firmware
supports four data types:
• 02H is CAS data
• 04H is R2MF tone data
• 08H is SigDet ON data
• 10H is SigDet OFF data
More information on data types is provided in Section 18.4, “Payload Formats”, on page 91.
Timestamp
This field is a 4 byte field (unsigned 32 bit integer) representing the number of firmware timer
ticks since the board was started. Each tick is equivalent to 4 milliseconds. This field is
encoded in the Little Endian format
1
.
Length of payload/Channel number
This field is a 2 byte field (unsigned 16 bit integer) whose most significant 5 bits represent the
channel number and least significant 11 bits represent the length of the payload starting at the
next byte. This field is encoded in the Little Endian format
1
.
Payload
This field is a number of bytes (number specified by the “length of payload” field above)
representing the event that occurred in the firmware.
Table 1. Structure of Data - Tracing CAS Signaling
Field Size of Field
Data Type 1
Timestamp 4
Length of Payload / Channel Number*
2
Payload N
Data Type 1
Timestamp 4
Length of Payload / Channel Number 2
Payload N
... ... ...
*The most significant 5 bits represent the channel number and the least
significant 11 bits represent the length of the payload.
1. The least significant byte of the number is stored in the lowest memory address, and the most
significant byte of the number is stored in the highest memory address.