[partial-reconfig] Unable to combine symbols into a singal IOB

Dear All,

I'm working in a simple design using EDK Microblaze system and Xilinx Modular Design Flow with ISE 6.2i. The design is composed by two modules. One Fixed (the Microblaze system) and another reconfigurable with a very simple logic. The reconfigurable modules are synthesized fine but when I try the active phase in the fixed module the following error message is issued:

________________________________________________________

ERROR:Pack:1107 - Unable to combine the following symbols into a single
IOB
component:
PULL symbol "fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin<0>_PULLDOWN" (Output
Signal = fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin<0>)
BUF symbol "sys/iobuf_40/IBUF" (Output Signal =
sys/fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin_I<0>)
TBUF symbol "sys/iobuf_40/OBUFT" (Control Signal =
fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin_T<0>)
PAD symbol "sys/fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin<0>" (Pad Signal =
fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin<0>)

The component belongs to a closed area group.

ERROR:Pack:1107 - Unable to combine the following symbols into a single
IOB
component:
PULL symbol "fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin<1>_PULLDOWN" (Output
Signal
= fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin<1>)
BUF symbol "sys/iobuf_41/IBUF" (Output Signal =
sys/fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin_I<1>)
TBUF symbol "sys/iobuf_41/OBUFT" (Control Signal =
fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin_T<1>)
PAD symbol "sys/fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin<1>" (Pad Signal =
fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin<1>)

The component belongs to a closed area group.
______________________________________________________________

Probally this issue is due the following lines in the ucf file:

Net fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin<1> LOC=P20;
Net fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin<1> IOSTANDARD = SSTL2_I;
Net fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin<1> PULLDOWN;
Net fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin<0> LOC=P19;
Net fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin<0> IOSTANDARD = SSTL2_I;
Net fpga_0_DDR_SDRAM_16Mx16_DDR_DQS_pin<0> PULLDOWN;

I tried use the following command line:

XIL_NGDBUILD_NO_PUSH_IOBUFS=1

That is described in Xilinx Support page

http://www.xilinx.com/xlnx/xil_ans_display.jsp?iLanguageID=1&iCountryID=1&getPagePath=19845

But isn't working!!!

Somebody can help me about this message error?

Thanks in advance,

Remy Eskinazi