Logic Analyzer

Trigger Condition

Capture process is initiated when the input signals match a predefined pattern or sequence. A logic analyzer can be programmed to start recording when a specific address appears on a bus or when an error flag is raised. This selective data gathering ensures that the available memory is used to store only the relevant events.

Complex triggers can involve multiple levels of logic and timing constraints to isolate rare or intermittent software bugs.

Memory Depth

Number of samples that can be stored determines the total duration of the recorded window. A high sample rate provides better timing resolution but consumes memory more quickly. When a logic analyzer runs out of buffer space, it stops recording or overwrites the oldest data.

Large memory buffers are needed to capture long sequences of data, such as the entire boot process of a module or a long file transfer. The balance between the sampling speed and the memory depth is the most important factor in selecting the right instrument for a specific task. Software tools then process this raw data to present it in a readable format for the user.

Channel Capacity

Total count of simultaneous inputs defines how much of the system can be observed at once. A logic analyzer with a high channel count can monitor several different buses and control signals at the same time. This visibility is helpful for debugging interactions between different parts of a circuit.

Probing techniques like high impedance tips are used to minimize the electrical load on the system being measured.