RLOC question

hello,

i am using RLOC statement as ..

//synthesis attribute rloc of d1 is X12Y11

As far as i understand, these X-Y co-ordinates specify the Slice number.

My first question is - how do i specify which of the two flip-flops(in one slice) to use?

.. i was going thru the documentation, where i noticed RLOC_RANGE option, has anybody used this option.

i tried it as -

//synthesis attribute RLOC_RANGE of d1 is X0Y0:X2Y2

the MAP failed and reported,

ERROR:Map:10 - RLOC_RANGE attribute on FD symbol "d1" (output signal=t) must be on the start of a set.

What am i doing wrong?

thanks, varun