FAQ for NEXUS
Connect a Nexus Probe to a PowerTrace Unit Incorrect Nexus-POD CPLD Revision Missing Address Information on Top of the Trace home Documents FAQ FAQ for NEXUS PDF document ( 7KB / Mar-3-2008 )

FAQ for NEXUS

Connect a Nexus Probe to a PowerTrace Unit
		How do I correctly connect a Nexus Probe to a PowerTrace unit?
	A Nexus probe has one, two or three ribbon cables for the connection to the PowerTrace unit. The PowerTrace has three connectors which are marked with A, B and C. (C is close to the black heatsink) Nexus probe connectors of newer probes are also marked with A, B and C. Place the appropriate cable into the corresponding connector. For older probes note the following: Probes with a single cable: connect the ribbon cable to connector C. Probes with two cables: connect the upper cable to connecter C, the second cable underneath to B. Probes with three cables: connect the upper cable to connecter C, the second cable underneath to B and the third cable below to connector A. One does not require an additional JTAG dongle!
Incorrect Nexus-POD CPLD Revision
		What is the reason for "Incorrect Nexus-POD CPLD revision" message?
	There are several reasons for the following message: Incorrect Nexus-POD CPLD revision - Please call technical support (refer to AREA) A wrong T32xxx.EXE has been executed (e.g. Super10.exe for a Copperhead probe) Just use the right SW. The current SW contains a new image for the CPLD on the probe. This reason is very seldom, but it may happen. One have to consider, that it is just a warning and normally one can continue using the debugger. However only for the case, the Area window shows a similar "expected CPLD revision number". It is recommended to contact your next support office. One will get a SW-Tool and some instructions how to fix it. The probe is defective. This reason can be recognized if the expected CPLD revision number is totally different from the current CPLD revision number, or even 0x00000 or 0xFFFFF. It is a serious reason and requires to send the probe back for repair. Also contact your local support office first.
Missing Address Information on Top of the Trace
		Is there any reason why symbol addresses and names are not displayed from the beginning of the trace?
	The Nexus protocol defines that a full address is transferred only occasionally, just in a Branch-Trace-Sync-Message and Data-Trace-Sync-Message. Most of the time only the significant portion of the current address is generated in the device and transferred in a Nexus message. Therefore the address can only be reconstructed and displayed after occurrence of a Sync-Message in the trace memory. A Sync messages is generated automatically after 255 messages latest. A single Nexus message without knowing what had happened before is useless! Look at the T.L /NEXUS , then one will see the location of the DTSM . After that location the address information is visible. A Sync message could be missing on top of the trace in the following cases: Any time Program is running before trace is in ARM state! Normally if analyzer is armed manually! In FIFO mode if trace memory overflows. Selective trace using Watchpoints Selective trace using CTU Some other cases.