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Project Compiler Error

Reference

Summary

Technical Reference

TR0142 (v1.1) November 03, 2007

This comprehensive reference describes each of the

possible electrical and drafting violations that can exist in

source documents when compiling a project.

The process of compiling is integral to producing a valid netlist for a project. Connectivity awareness in

your schematic diagram can be verified during compilation according to rules that are set up in your

Project Options (C » O) in the Error Reporting and Connection Matrix tabs. You can customize

reporting modes for violations in the

Error Reporting and Connection Matrix tabs. Choose from:

•

Figure 1. The Error Reporting tab in Project Options

To change the Report Mode for a violation in the Error Reporting tab, click on the current Report

Mode and select an alternative from the dropdown.

TR0142 (v1.1) November 03, 2007 1

TR0142 Project Compiler Error Reference

Violations Associated with Buses

Arbiter loop in OpenBus document

This compiler hint appears when the IO and MEM ports of a processor in the OpenBus System are

linked, through a single Arbiter component, to the same slave memory or I/O peripheral device,

effectively forming a loop. The message is displayed in the Messages panel in the following format:

Arbiter ArbiterName is in the loop,

where

ArbiterName is the designator of the offending Arbiter component.

Default Report Mode

Recommendation

It is nonsensical in a processor-based system to connect a slave device to both the Peripheral I/O and

External Memory interfaces of a processor concurrently. Therefore ensure that the IO and MEM ports

of a processor in the OpenBus System are linked to their intended (and different) slave devices using

distinct interconnects – Interconnect and/or Arbiter components. Typically for a single processor

system, an Interconnect component and one or more Arbiter components would be used on the MEM

side of the processor, with the processor and any memory-based peripheral I/O devices linked to slave

memory through the Arbiter(s). The IO side of the processor would involve use of an Interconnect

component only, to which the bank of peripheral I/O devices – to be used by the processor – are linked.

Bus indices out of range

This compiler hint appears when the index of a constituent net connected to a bus lies outside the

range specified by the net to which the bus is associated. The message is displayed in the

Messages

panel in the following format:

Bus index out of range on NetPrefix Index = NetIndex,

where

NetPrefix is the prefix of the constituent net connected to the bus (e.g. A for net A1, connected to a

bus associated to net A[0..7])

NetIndex is the erroneous index of the constituent net (e.g. net A8 has an index of 8).

Default Report Mode

Recommendation

Use the Compile Errors dialog to quickly cross probe to the net label associated with the offending net

and either amend the index of the net so that it lies within the correct range, or rename the net

altogether. The latter would be typical if you have named the net by mistake and it is not a constituent

of the net transported by the bus object.

4 TR0142 (v1.1) November 03, 2007

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