Thanx rca,
actually i gone through theory, so i find that three way of cell row configuration:
1) flip every other cell row which does not leave a gap between the cell rows.
2) flip every other cell row, but leave a gap between every two cell rows.
3) leave a gap between every cell row, and not flip the cell rows.
The purpose of the gaps is to allocate more resources for the inter-connect routings.
Thats why i eagerly wanted to know about non-flip cell row configuration. I think due to number of metal layers available for routing nowadays in asic, we are not using this configuration, am i right?