Data Sheet
June 1999
ORCA Series 3C and 3T FPGAs
Package Outline Diagrams
Terms and Definitions
Basic Size (BSC):
The basic size of a dimension is the size from which the limits for that dimension are derived
by the application of the allowance and the tolerance.
Design Size:
The design size of a dimension is the actual size of the design, including an allowance for fit
and tolerance.
Typical (TYP):
When specified after a dimension, this indicates the repeated design size if a tolerance is
specified or repeated basic size if a tolerance is not specified.
Reference (REF):
The reference dimension is an untoleranced dimension used for informational purposes only.
It is a repeated dimension or one that can be derived from other values in the drawing.
Minimum (MIN) or
Maximum (MAX):
Indicates the minimum or maximum allowable size of a dimension.
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