2.4.3. Error packets

Error packets are generated and inserted in the trace stream when information is lost because of overflow.

The front-end interface block which experiences the master error condition, either the AXI or hardware interface, requests that an MERR packet is generated at the next opportunity. The error conditions causing MERR generation are specified with the front-end interface functionality.

MERR packets

MERR packets are master-specific. An MERR packet referring to a currently inactive master is preceded by an M8 packet. When the MERR packet is generated, the active channel is reset to 0.

MERR has an 8-bit payload which is always 0x00.

GERR packets

GERR packets are generated and inserted in the trace stream when more than one master experiences an error condition and MERR cannot be output for each master.

GERR has an 8-bit payload which is always 0x00.

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