Answers Database
XABEL: How to assign preload value to registers in an EPLD
Record #1349
Product Family: Software
Product Line: Data I/O
Product Part: xabel
Product Version: 5.2
Problem Title:
XABEL: How to assign preload value to registers in an EPLD
Problem Description:
From my ABEL file, how can I control the preload value of macrocell registers
during device powerup?
*NOTE*: This Solution applies to EPLDs only. For information on assigning
preload values to FPGAs, see Solution #1350
Solution 1:
In M1, use:
XILINX PROPERTY 'INIT=S|R signal_name...';
(xepld_property syntax is obsolete in M1.)
Solution 2:
To assign a preload value to a register, use the following
XEPLD property statement in the DECLARATIONS section of the
ABEL file.
xepld property 'EQUATION <reg_name>.PRLD = VCC|GND';
For example, to preload a register to 0 at powerup:
xepld property 'EQUATION <reg_name>.PRLD = GND';
OR, to preload a register to 1 at powerup:
xepld property 'EQUATION <reg_name>.PRLD = VCC';
Where <reg_name> is a register previously declared in the
DECLARATIONS section.
End of Record #1349 - Last Modified: 08/11/97 20:34 |
