altdpram with NUMWORDS = 1

[Altera_Forum]

I all,  

 I tried to instanciate an altdpram with NUMWORDS => 1 and WIDTHA => 1.    According to http://quartushelp.altera.com/11.1/mergedprojects/hdl/mega/mega_file_altdpram.htm this is OK: Parameter ; Type ; Required ; Description NUMWORDS ; Integer ; No ; Number of words stored in memory. This value must be within the range 2^(WIDTHAD - 1) < NUMWORDS <= 2^WIDTHAD. If omitted, the default is 2^WIDTHAD.     I get the following error:   --- Quote Start ---  Error: Assertion error: Value of NUMWORDS parameter requires 0 address lines, but WIDTHAD value, which defines the number of address lines, is 1 Error: Can't elaborate user hierarchy "altdpram:ram" Error: Quartus II 64-Bit Analysis & Synthesis was unsuccessful. 2 errors, 494 warnings  Error: Peak virtual memory: 1594 megabytes  Error: Processing ended: Thu Jun 28 09:43:13 2012  Error: Elapsed time: 00:02:23  Error: Total CPU time (on all processors): 00:02:20 Error: Quartus II Full Compilation was unsuccessful. 4 errors, 494 warnings  --- Quote End ---      Has anyone faced this issue? What can I do?    P.S.: You may think that it's stupid to instanciate a memory of depth 1.  Actually the depth is generic and may be greater than 1, which is why I need a memory. But I need the system to work even if the user wants a depth of 1.    Thx    Julien

[Altera_Forum]

--- Quote Start ---  I tried to instanciate an altdpram with NUMWORDS => 1 and WIDTHA => 1.  --- Quote End ---  Mathematically incorrect, isn't it? 2^(WIDTHAD - 1) seems simply wrong.  Most likely,you need to generate a RAM with NUMWORDS = 2 and map it respectively.

[Altera_Forum]

As an additional observation, I have no difficulties to set NUMWORDS values smaller than (2^widthad-1) with altsyncram, also NUMWORDS = 1 in a direct instantiation of the VHDL component. 

 I don't know if there are any differences with altdpram, which it isn't but a wrapper of altsyncram.