Place-and-route boundary Abutting One row Shared power rail Offset Offset row
Chapter 5: Library Cell Preparation Set the Place-and-Route Boundary 5-24 Library Data Preparation for IC Compiler™ User Guide J-2014.09-SP2 Library Data Preparation for IC Compiler™ User Guide Version J-2014.09-SP2 Figure 5-19 Cell Library > Set PR Boundary Dialog Box Enter the required information in the Set PR Boundary dialog box. To get suggested values for the offset and height values, click the Analyze button. With the options filled in, click the OK button to generate the cell boundary or boundaries.
Chapter 5: Library Cell Preparation Set the Multiple-Height Boundary 5-25 Library Data Preparation for IC Compiler™ User Guide Version J-2014.09-SP2 Set the Multiple-Height Boundary You can adjust the place-and-route boundary for a double-height or triple-height cell by choosing the Cell Library > Multi Height Cell command in the Milkyway Environment tool. This command checks the power and ground height and width, suggests floorplan options, and checks the row spacing rule in the technology file. The command opens the Set Multiple Height PR Boundary dialog box, as shown in Figure 5-20 . Figure 5-20 Cell Library > Set PR Boundary Dialog Box In the Library Name text box, enter the name of the Milkyway library. In the Cell Name text box, enter the name of a single cell or a wildcard pattern; use the “pattern match” option with a wildcard pattern. In the Tile Name text box, enter the name of the tile used for adjusting the boundary. To adjust the place-and-route boundary as well as set the cell row orientation, select the “adjust PR boundary” option. Otherwise, you only set the cell row orientation. Click the OK button to perform the requested actions. Note: A multiple-height standard cell must be designed to use the same power rail as the single-height cells in the first lower rail position in the cell. Double-Height Standard Cell With Two Power Supplies By default, a standard cell has one primary power pin and one primary ground pin, located on opposite ends of the cell (top and bottom). When the cell is placed in a row, the power and ground pins are aligned with the power and ground rails of the row.
Chapter 5: Library Cell Preparation Double-Height Standard Cell With Two Power Supplies 5-26 Library Data Preparation for IC Compiler™ User Guide J-2014.09-SP2 Library Data Preparation for IC Compiler™ User Guide Version J-2014.09-SP2 The Milkyway Environment tool supports an alternative type of standard cell that has double the standard height, two different power pins (for example, VDD and VDDS) at opposite ends of the cell, and a single ground pin at the center of the cell. During library cell preparation, these are the key steps for setting the place-and-route boundary for a double-height, dual-power cell: 1. Set the mwlib_second_power_on_top variable to true if the second power rail is at the top, or leave it set to false if the second power rail is at the bottom.
- Fall '18
- Dialog box, Electronic design automation, Standard cell, library data preparation, Milkyway library