EPXA4 datasheet(21/34 Pages) ALTERA

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Altera Corporation

Errata Sheet - Appendix A

Conditions

This occurs when both of the following are true:

■ ViewData is enabled.

■ Either data value or data address tracing are enabled (bits 3:2 of

Implications

Extra CPRT data is traced. Since the number of such transfers is relatively

small, the amount of extra data generated should not be significant.

As there is no requirement for the tools to correctly handle CPRT data

traced when the MonitorCPRT bit is not set, this may result in unexpected

behavior.

Workaround

If this erratum causes an error in the development tools, the user must

always enable coprocessor register transfer tracing.

The tools must be able to handle CPRT data traced even when no CPRT

data was expected.

If this the extra trace is deemed to be confusing to the user, the tools can

ignore CPRT data when CPRT data tracing has been disabled.

Implications of workaround

A small amount of bandwidth may be wasted.

A.2.6

Stall cycles reported on wrong instruction—Category 2

Description

The timestamps or cycle numbers, if captured, might not truly reflect the number

of cycles taken by each instruction. Stall cycles which cause an instruction to take

longer than the minimum time to execute might be reported on an earlier

instruction.

EPXA4 Datasheet(PDF) 21 Page - Altera Corporation