Intel® Quartus® Prime Software
Intel® Quartus® Prime Design Software, Design Entry, Synthesis, Simulation, Verification, Timing Analysis, System Design (Platform Designer, formerly Qsys)
16614 Discussions

Altaccumulate megafunction

Altera_Forum
Honored Contributor II
‎04-04-2010 09:45 AM
1,096 Views

I'm runnung Altera Quartus II v.9.1 to programming a Cyclone III device and i have some problem with the altaccumulate megafuncition. Looking with an DSO the output of my program i see a lot of spark when i put a negative constant into the altaccumulate (signed 2's complement). Looking more attently i saw that the problem is that sometimes casually after the aclr pass trouth 1 value to 0 the accumulate start to sum the data input from a casual number and not from zero. 

waiting your response  

Luca
0 Kudos

Link Copied

1 Reply
Altera_Forum
Honored Contributor II
‎04-04-2010 02:21 PM
348 Views

To avoid timing violations, an asynchronous reset must be released synchronous to clk. The same applies to any asynchronous clear. Follow the respective recommendations for reset generation in the Quartus software manual, you'll also find various contributions in Altera forum related to this problem. It's better to use an synchronous clear respectively load if ever possible.

0 Kudos
Copy link
Reply

Community support is provided during standard business hours (Monday to Friday 7AM - 5PM PST). Other contact methods are available here.

Intel does not verify all solutions, including but not limited to any file transfers that may appear in this community. Accordingly, Intel disclaims all express and implied warranties, including without limitation, the implied warranties of merchantability, fitness for a particular purpose, and non-infringement, as well as any warranty arising from course of performance, course of dealing, or usage in trade.

For more complete information about compiler optimizations, see our Optimization Notice.