set

it2023-03-02 92

NAME set_pad_physical_constraints Sets physical constraints per pad instance.

SYNTAX status set_pad_physical_constraints objects | -pad_name pad_name [-side side_number]在那条边 [-order order_number]顺序 [-offset offset_distance]离chip边缘的的距离 [-ring ring_number] [-orientation reflect | optimizeReflect] [-min_left_iospace min_space_left] [-min_right_iospace min_space_right] [-chip_level_distance {keyword_value_pairs}] [-chip_level_ring {{depth ring_count}} [-lib_cell] [-lib_cell_orientation {l_orient t_orient r_orient b_orient}

Data Types objects collection pad_name string side_number integer order_number integer offset_distance float ring_number integer min_space_left float min_space_right float keyword_value_pairs list ring_count integer l_orient string t_orient string r_orient string b_orient string

ARGUMENTS objects Specifies the pad cells to which the specified constraints apply. You can specify one or more pad cells that currently exist in the design. However, only one object is allowed if you use the -order option.

This argument and the -pad_name option are mutually exclusive. You must specify the pad cells by using one of these arguments. -pad_name pad_name Specifies the name of the pad cell to which the specified con- straints apply. You can specify a single pad cell, which does not have to exist in the design. The constraint is stored in the database even though it might not get applied. If the pad is missing from the design, the constraint is applied automatically when you add a new pad with this name to the design. This option and the objects argument are mutually exclusive. You must specify the pad cells by using one of these arguments. -side side_number Specifies the die edge on which the pad must reside. Pads are supported for rectangular floorplans only. The valid values for this option are o 0 (default - no side constraints) o 1 (left side constraint) o 2 (top side constraint) o 3 (right side constraint) o 4 (bottom side constraint) The default is 0, which means that the pad does not have a side constraint. -order order_number Specifies the placement order number for the pad. The placement order is a clockwise ordering constraint for the left and top sides. The placement order is a counterclockwise ordering con- straint for the right and bottom sides. The order argument must be a positive integer. The default is 0, which means that the pad does not have an ordering constraint. -offset offset_distance Specifies the distance in microns that the pad must be offset from the die edge on which it is placed. Do not specify the -offset option with the -min_left_iospace or -min_right_iospace options, because the -offset option specifies the only legal location for this pad. In multiring I/O mode, the reference point is the lower-left corner of the ring where this pad is located, not the origin of the design. The specified value must be a non-negative floating point number. -ring ring_number Specifies the ring on which the pad is located. The ring is an inner-to-outer ordering constraint. This number must be a posi- tive integer between 1 to 6. The default is 1. -orientation reflect | optimizeReflect Specifies the lateral reflection mode. Valid values are: o reflect Reflects the pad instance about the axis through its center that is perpendicular to the edge on which the pad cell is sitting. o optimizeReflect The tool reflects the pad instance only if the area is opti- mized as a result. If you do not specify this option, no lateral reflection is done. -min_left_iospace min_space_left Specifies the minimum spacing in microns to the next I/O pad on the left side. The default is 0. -min_right_iospace min_space_right Specifies the minimum spacing in microns to the next I/O pad on the right side. The default is 0. -chip_level_distance {keyword_value_pairs} Specifies the minimum spacing in microns between the pads and the implied die corner. You specify the distance values using the following format: {keyword value} You can specify one or more of the following distance values: o {dist_left_edge_to_pad float} On the top and bottom die edges, specify the minimum distance in microns that pads must be placed away from the left die edge. The specified value must be a positive floating point number. The default is 0. o {dist_bottom_edge_to_pad float} On the left and right die edges, specify the minimum distance in microns that pads must be placed away from the bottom die edge. The specified value must be a positive floating point number. The default is 0. o {dist_right_edge_to_pad float} On the top and bottom die edges, specify the minimum distance in microns that pads must be placed away from the right die edge. The specified value must be a positive floating point number. The default is 0. o {dist_top_edge_to_pad float} On the left and right die edges, specify the minimum distance in microns that pads must be placed away from the top die edge. The specified value must be a positive floating point number. The default is 0. If you do not specify the distance, the default is 0. -chip_level_ring {{depth ring_count}} Specifies the total number of I/O pad rings in the design. The specified value must be a positive integer between 1 and 6. The default is 1. -lib_cell Enables orientation control for the specified object or pad name. You must specify the -lib_cell option when you specify a library cell orientation by using the -lib_cell_orientation option. By default, the tool uses the default cell orientation in the Milkyway library. -lib_cell_orientation {l_orient t_orient r_orient b_orient} Specifies the orientation adjustment based on the current I/O cells for the left, top, right and bottom sides of the rectangu- lar floorplan. You can set the orientation to one of the follow- ing values: N rotate 0-degrees W rotate 90-degrees S rotate 180-degrees E rotate 270-degrees FN rotate 0-degrees and mirror X FS rotate 0-degrees and mirror Y FW rotate 90-degrees and mirror X FE rotate 90-degrees and mirror Y For example, only the top side pads are affected by the -lib_cell -lib_cell_orientation { N FN N N } options.

DESCRIPTION Specifies physical design constraints on pads, such as location and offset between adjacent pads. The specified constraints are saved when the design is saved. The create_floorplan and create_floorplan commands follow these constraints when arranging the I/O pads for a design.

Multicorner-Multimode Support This command has no dependency on scenario-specific information.

EXAMPLES The following example specifies physical constraints on a pad.

prompt> set_pad_physical_constraints -pad_name "uDFT3/uINP0" \ -side 1 -order 1 -offset 248.34 The following example specifies that there are two I/O rings in the design. prompt> set_pad_physical_constraints -chip_level_ring {{depth 2}}

SEE ALSO create_floorplan(2) read_pin_pad_physical_constraints(2) remove_pin_pad_physical_constraints(2) report_pin_pad_physical_constraints(2) set_pin_physical_constraints(2) write_pin_pad_physical_constraints(2)

最新回复(0)