Answers Database
** DUPLICATE of 2249 ** M1.4 MAP: WARNING x4kma - signal on pin G4 of CY4 symbol is not required by carry mode INC-F-CI
Record #2908
Product Family: Software
Product Line: Merged Core
Problem Title:
** DUPLICATE of 2249 ** M1.4 MAP: WARNING x4kma - signal on pin G4 of
CY4 symbol is not required by carry mode INC-F-CI
Problem Description:
Keywords: CY4, carry mode, x4kma, MAP, cc16cle
Urgency: standard
Reference #: 16683
General Description:
MAP reports the following warning on a Xilinx library binary
counter which is implemented using Carry Logic (CC8CE,
CC8CLE, CC16CLE, etc.)
'WARNING x4kma - Signal on pin G4 of CY4 symbol
(output signal=$1I17/C14) is not required by carry mode
INC-F-CI. The signal is being removed.'
Solution 1:
You may safely ignore these warning messages when they are
issued against the specified Xilinx library macros, because
both the TC and CEO outputs of the carry logic in these
counters are not used.
MAP is simply optimizing the INC-FG-CI mode carry logic into
INC-F-CI and removing unecessary signals.
The warning may not be meaningful at first glance because
the optimization from INC-FG-CI to INC-F-CI that occurs
before the signals are actually trimmed is reported in a
separate section of the Map .MRP report. However, the
trimming is valid.
End of Record #2908
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