i A PHYSICAL IMPLEMENTATION WITH CUSTOM LOW POWER ...

the basic parameters are specified, the script can be use to initialize the ALU stripe using the
“floorplan” command available with Encounter [9]. The routine also adds power rings in the
space between the core and the IO of the chip using the “addRing” command [9]. The important
parameters used in the script are described in Table 5-3.
Table 5-3: ALU Initialization Parameters
S.No. ALU Initialization Parameters Description
1 CORE_TO_LEFT Distance between core and IO on left/ right/ top/
CORE_TO_RIGHT
CORE_TO_TOP
CORE_TO_BOTTOM
2 ALU_LEFT_DISTANCE
ALU_RIGHT_DISTANCE
bottom sides. Once the die width and height are
specified, these values determine the core width and
height
Each ALU has a certain space to its left and to its right
to enable routing of wires.
3 INTER_ALU_DISTANCE_MIN The distance between two ALUs without power
stripes between them which is the sum of the
ALU_LEFT_DISTANCE and
ALU_RIGHT_DISTANCE
4 INTER_ALU_DISTANCE_MAX The distance between two ALUs those have power
stripes between them. The value is the sum of
ALU_LEFT_DISTANCE,
ALU_RIGHT_DISTANCE and
5 POWER_RING_TOTAL_LEFT
POWER_RING_TOTAL_RIGHT
POWER_STRIPE_TOTAL_WIDTH
6 POWER_STRIPE_WIDTH Width of the power bus
The total width of the power ring on the left side. The
width of the power ring includes the wdith of the
VDD bus, GND bus, spacing between the VDD and
GND bus, spacing between the VDD bus and IO and
spacing between GND bus and the core
7 POWER_STRIPE_TOTAL_WIDTH Sum of VDD Bus width, GND Bus width and spacing
between them
7 POWER_STRIPE_SPACING Spacing between the VDD bus and GND bus
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