Answers Database
M1.4 XC3000/3100: The signal "<signal between ipad and bufg>" is unused and has been removed.
Record #3519
Product Family: Hardware
Product Line: 3100A
Product Part: 3100A
Problem Title:
M1.4 XC3000/3100: The signal "<signal between ipad and bufg>" is unused and has been
removed.
Problem Description:
Urgency: Standard
General Description: M1.4: In a XC3000 family part, logic is
removed that appears to be connected properly. The map report
(map.mrp) lists logic removed similar to:
The signal "$1N24" is unused and has been removed.
Unused block "$1I12" (IPAD) removed.
The signal "$1N28" is unused and has been removed.
Unused block "$1I7" (OBUF) removed.
The signal "Q_BUFG" is unused and has been removed.
Unused block "$1I4/$1I37" (FDCE) removed.
The signal "CLK_BUFG" is unused and has been removed.
Unused block "$1I2" (BUFG) removed.
Unused block "$1I9" (OPAD) removed.
A BUFG appears as one of the last items removed.
Both BUFG and either ACLK or GCLK are used in the design.
Solution 1:
The XC3000 family may use either all BUFGs or ACLK and GCLK,
but not both in the design.
The mapping software has trouble converting the BUFG to the unused clock buffer.
Use only BUFG OR xCLK as your global buffers.
End of Record #3519 - Last Modified: 03/08/98 13:51 | 
