Answers Database

M1.4 Hitop - Optimization disregards that control signals can have only 1 pterm.


Record #3733

Product Family:  Software

Product Line:  CPLD Implementation

Problem Title:
M1.4 Hitop - Optimization disregards that control signals can have only
1 pterm.



Problem Description:
The M1.4 software collapses logic into control signals
disregarding that a control signal can have only 1 product
term. Additional internal nodes are created to implement
the collapsed logic.  Each internal node occupies a macrocell
and for this design we run out of resources and can't fit the
design to the targeted device.


Solution 1:

This problem is fixed in the latest M1.4 CPLD Patch available
on the Xilinx Download Area:

ftp://ftp.xilinx.com/pub/swhelp/M1.4_alliance/cpld_sol9_m14.tar.Z
ftp://ftp.xilinx.com/pub/swhelp/M1.4_alliance/cpld_sun9_m14.tar.Z
ftp://ftp.xilinx.com/pub/swhelp/M1.4_alliance/cpld_hp9_m14.tar.Z
ftp://ftp.xilinx.com/pub/swhelp/M1.4_alliance/cpld_nt9_m14.zip

These update files also include the changes from previous cpld updates.

All zip files are created using WinZip. To obtain this utility,
access WinZip's web site at http://www.winzip.com



End of Record #3733