AR# 3733: M1.4 CPLD Hitop - Optimization disregards that control signals can have only 1 pterm.
AR# 3733
M1.4 CPLD Hitop - Optimization disregards that control signals can have only 1 pterm.
Description
Keywords: 1.4, cpld, hitop
Urgency: Standard
General 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
This problem is fixed in the latest M1.4 CPLD Patch available on the Xilinx support website: