Teledyne LeCroy Serial Data Debug Solutions - Manual (Page 54)

Serial Data Debug Solutions
54 919586 RevA
Oftentimes, I 2 C utilizes DATA bytes to specify sub-addresses for accessing memory locations in EEPROMs.
Conditional DATA trigger allows triggering on a range of DATA bytes corresponding with reads or writes to
specific sub-address memory blocks in the EEPROM. It can also aid in monitoring DATA outputs from I
2 C- based
sensors, such as analog-to-digital converters, and triggering when DATA is outside a safe operating range. In
both cases, verifying proper operation becomes a simple task. Other powerful and user-friendly features
included in I
2 Cbus TD trigger include:

Ability to define and ADDR or DATA condition in either Binary or Hexadecimal (Hex) formats.

Ability to define an ADDR condition in binary with the DATA condition defined in hexadecimal so as to
trigger on a range of ADDR values using Don’t Care bits.

FRAME LENGTH trigger setups.

EEPROM trigger setups to trigger on up to 96 bits (12 bytes) of DATA at any location within an I 2 C frame or
at a user-defined location in a 2048 byte window.

All permutations of Read, Write, or R/W Don’t Care conditional setup for 7 and 10-bit addresses.

For any I 2 C message trigger, select whether an ACK condition should be ACK, NO ACK, or DON’T CARE. You
can choose to trigger on a NO ACK condition by itself, or as part of a more complex ADDR/DATA trigger.
If you are not familiar with or are just learning about I 2 C, start by using the simplest trigger conditions (Start,
Stop, ReStart, NoAck) to gain confidence, and then set up simple ADDR only conditions. When you are confident
with understanding I
2 C operation, set up an ADDR+DATA condition with a condition of “DATA =”. Then, try
different setups using other DATA conditions (>, <, INRANGE, etc.). Lastly, experiment with the EEPROM trigger
setup, which provides the most flexibility by allowing location of data, with conditions, within specific bytes of a
long sequence of DATA bytes.
Note: Ask your local LeCroy representative for more information about any Serial Data Debug Solution
Protocols or Toolkits using the Contact LeCroy for Support (on page 199) topic.
I 2 C Decode Setup Detail
For general information about using controls shown on the main Serial Decode dialog, refer to Accessing The D
and TD Supported Protocol Toolsets (on page 13).
I 2 C B ASIC AND L EVELS R IGHT -H AND D IALOGS
Access the Serial Decode dialog by touching Analysis → Serial Decode on the menu bar.
Touch the corresponding Setup... button for your decode. The Decode Setup... along with corresponding right-
hand dialogs are shown.
I 2 C Basic Right-Hand Dialog
The Basic right-hand dialog provides detailed controls and setup conditions as follows: