################################################################################
##
## PROJECT         DDR-SDRAM Controller Core
##
## DATE            $Date: 2003/03/19 06:43:40 $
##
## LANGUAGE        VHDL 93
##
## ABSTRACT        DDR-SDRAM Controller
##                 User Constraints File
##                 NOTE : Pin location constraints are only for example
##
## AUTHOR          Markus Lemke
##                 markus@opencores.org
##
################################################################################
##
## Copyright (C) 2002 Markus Lemke, www.array-electronics.de
##  
## Everyone is permitted to copy and distribute  and  modify 
## this  document  under  the  terms of the OpenIPCore Hardware
## General  Public License "OHGPL" which can  be  read  in  the
## file LICENSE.
##  
## The  License  grants  you  the right to copy, modify  and
## redistribute this file,  but only under  certain  conditions 
## described in the License.  Among other things,  the  License
## requires that  this  copyright  notice  and  the  associated
## disclaimer  be preserved on  all copies.  Every copy of this
## file must include a copy of the License, normally in a plain
## ASCII text file named LICENSE.
##  
## 
## DISCLAIMER
## 
## THIS SOFTWARE  IS  PROVIDED  ``AS IS''  AND  WITHOUT ANY  
## EXPRESS  OR  IMPLIED  WARRANTIES, INCLUDING, BUT NOT LIMITED 
## TO, THE  IMPLIED  WARRANTIES OF  MERCHANTABILITY AND FITNESS
## FOR A  PARTICULAR  PURPOSE.  IN NO EVENT SHALL THE AUTHOR OR 
## CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL,  EXEMPLARY,  OR CONSEQUENTIAL  DAMAGES  (INCLUDING,
## BUT NOT  LIMITED TO,  PROCUREMENT  OF  SUBSTITUTE  GOODS  OR 
## SERVICES;  LOSS  OF  USE,  DATA,  OR  PROFITS;  OR  BUSINESS 
## INTERRUPTION) HOWEVER CAUSED  AND ON ANY THEORY O LIABILITY,
## WHETHER  IN CONTRACT, STRICT  LIABILITY, OR  TORT (INCLUDING 
## NEGLIGENCE OR OTHERWISE)  ARISING IN ANY WAY OUT OF THE  USE 
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 
## DAMAGE.                              
################################################################################


# Specifying global clock period
net "clk"     period = 100 MHz ;

net "*sys_reset_1_q" MAXDELAY = 10 ns;
net "*sys_reset_1_q" TIG;

# The following timespec is only for demonstration of P&R,
# All Core DDR SDRAM I/Os should use IOB-FFs !
timespec ts_non = from FFS to PADS 10 ns; 

# location constraints (this is an example !)
NET a_q<0> LOC=B18; 
NET a_q<1> LOC=A18;
NET a_q<2> LOC=B17;
NET a_q<3> LOC=A17;
NET a_q<4> LOC=N17;
NET a_q<5> LOC=P18;
NET a_q<6> LOC=P17;
NET a_q<7> LOC=M18;
NET a_q<8> LOC=M19;
NET a_q<9> LOC=M20;
NET a_q<10> LOC=A19;
NET a_q<11> LOC=N18;
NET a_q<12> LOC=N20;

NET data<0> LOC=Y21;
NET data<1> LOC=Y22;
NET data<2> LOC=W21;
NET data<3> LOC=V21;
NET data<4> LOC=V22;
NET data<5> LOC=U21;
NET data<6> LOC=U22;
NET data<7> LOC=T21;
NET data<8> LOC=R20; 
NET data<9> LOC=R19;
NET data<10> LOC=T20;
NET data<11> LOC=T19;
NET data<12> LOC=U19;
NET data<13> LOC=V20;
NET data<14> LOC=V19;
NET data<15> LOC=W20;
NET ba_q<0> LOC=M21;
NET ba_q<1> LOC=B19;
NET ras_qn LOC=N21;
NET cas_qn LOC=P21;
NET we_qn LOC=R22;
NET dm_q<0> LOC=R21;
NET dm_q<1> LOC=T22;
NET cs_qn LOC=N22;
NET cke_q LOC=N19;
NET dqs_q<0> LOC=P20;
NET dqs_q<1> LOC=P19;
NET sdr_clk LOC=D12;
NET sdr_clk_n LOC=E12;

NET clk_fb LOC = "F13";
NET clk LOC = "D11";

NET "rst_n" LOC = B6; #

# Defining I/O Standards

NET a_q<0> IOSTANDARD = SSTL2_I;
NET a_q<1> IOSTANDARD = SSTL2_I;
NET a_q<2> IOSTANDARD = SSTL2_I;
NET a_q<3> IOSTANDARD = SSTL2_I;
NET a_q<4> IOSTANDARD = SSTL2_I;
NET a_q<5> IOSTANDARD = SSTL2_I;
NET a_q<6> IOSTANDARD = SSTL2_I;
NET a_q<7> IOSTANDARD = SSTL2_I;
NET a_q<8> IOSTANDARD = SSTL2_I;
NET a_q<9> IOSTANDARD = SSTL2_I;
NET a_q<10> IOSTANDARD = SSTL2_I;
NET a_q<11> IOSTANDARD = SSTL2_I;
NET a_q<12> IOSTANDARD = SSTL2_I;
NET dm_q<0> IOSTANDARD = SSTL2_I; 
NET dm_q<1> IOSTANDARD = SSTL2_I; 
NET ba_q<0> IOSTANDARD = SSTL2_I; 
NET ba_q<1> IOSTANDARD = SSTL2_I; 
NET ras_qn IOSTANDARD = SSTL2_I;  
NET cas_qn IOSTANDARD = SSTL2_I;  
NET we_qn IOSTANDARD = SSTL2_I; 
NET sdr_clk IOSTANDARD = SSTL2_I; 
NET sdr_clk_n IOSTANDARD = SSTL2_I;
NET dqs_q<0> IOSTANDARD = SSTL2_I;
NET dqs_q<1> IOSTANDARD = SSTL2_I;
NET cs_qn IOSTANDARD = SSTL2_I; 
NET cke_q IOSTANDARD = SSTL2_I; 
NET data<0> IOSTANDARD = SSTL2_I; 
NET data<1> IOSTANDARD = SSTL2_I; 
NET data<2> IOSTANDARD = SSTL2_I; 
NET data<3> IOSTANDARD = SSTL2_I; 
NET data<4> IOSTANDARD = SSTL2_I; 
NET data<5> IOSTANDARD = SSTL2_I; 
NET data<6> IOSTANDARD = SSTL2_I; 
NET data<7> IOSTANDARD = SSTL2_I; 
NET data<8> IOSTANDARD = SSTL2_I; 
NET data<9> IOSTANDARD = SSTL2_I; 
NET data<10> IOSTANDARD = SSTL2_I; 
NET data<11> IOSTANDARD = SSTL2_I; 
NET data<12> IOSTANDARD = SSTL2_I; 
NET data<13> IOSTANDARD = SSTL2_I; 
NET data<14> IOSTANDARD = SSTL2_I; 
NET data<15> IOSTANDARD = SSTL2_I; 
NET clk_fb IOSTANDARD = SSTL2_I;


# set NODELAY attribute for input signals 
#By default, the IBUF has a DELAY element to guarantee 0 hold time
#By turning off the DELAY element, we save ~2ns in IBUF delay
NET data<0> NODELAY; 
NET data<1> NODELAY; 
NET data<2> NODELAY; 
NET data<3> NODELAY; 
NET data<4> NODELAY; 
NET data<5> NODELAY; 
NET data<6> NODELAY; 
NET data<7> NODELAY; 
NET data<8> NODELAY; 
NET data<9> NODELAY; 
NET data<10> NODELAY; 
NET data<11> NODELAY; 
NET data<12> NODELAY; 
NET data<13> NODELAY; 
NET data<14> NODELAY; 
NET data<15> NODELAY; 


#Set FAST attribute for all outputs
NET "a_q<0>" FAST;
NET "a_q<1>" FAST;
NET "a_q<2>" FAST;
NET "a_q<3>" FAST;
NET "a_q<4>" FAST;
NET "a_q<5>" FAST;
NET "a_q<6>" FAST;
NET "a_q<7>" FAST;
NET "a_q<8>" FAST;
NET "a_q<9>" FAST;
NET "a_q<10>" FAST;
NET "a_q<11>" FAST;
NET "a_q<12>" FAST;
NET "dm_q<0>" FAST; 
NET "dm_q<1>" FAST; 
NET "ba_q<0>" FAST; 
NET "ba_q<1>" FAST; 
NET "ras_qn" FAST;  
NET "cas_qn" FAST;  
NET "we_qn" FAST; 
NET "sdr_clk" FAST; 
NET "sdr_clk_n" FAST;
NET "dqs_q<0>" FAST;
NET "dqs_q<1>" FAST;
NET "cs_qn" FAST; 
NET "cke_q" FAST; 
NET "data<0>" FAST; 
NET "data<1>" FAST; 
NET "data<2>" FAST; 
NET "data<3>" FAST; 
NET "data<4>" FAST; 
NET "data<5>" FAST; 
NET "data<6>" FAST; 
NET "data<7>" FAST; 
NET "data<8>" FAST; 
NET "data<9>" FAST; 
NET "data<10>" FAST; 
NET "data<11>" FAST; 
NET "data<12>" FAST; 
NET "data<13>" FAST; 
NET "data<14>" FAST; 
NET "data<15>" FAST; 

#Set PULLUPS for some signals
NET ras_qn PULLUP;
NET cas_qn PULLUP;
NET we_qn PULLUP;
NET cs_qn PULLUP;