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Schematic Syntax

This section describes how to place attributes on symbols on a schematic. The following guidelines are for specifying locations.

Following are some examples of location attributes.

LOC=CLB_R1C2
Locates the element in the CLB in the first row, second column.
LOC=CLB_R1C2.LC3
Locates the element in the top-most slice of the four slices of the XC5200 CLB located in the first row, second column.
LOC=CLB_R1C2.S1
Locates the element in the right-most slice of the two slices of the Virtex CLB located in the first row, second column.
LOC=P12
Assigns the signal to the pin P12 (for CPLDs).
RLOC=R4C4
Assigns the location relative to other elements in the set to row 4, column 4.
RLOC=R0Cl.FFX
Assigns the location relative to other elements in the set to the X flip-flop in row 0, column 1.
RLOC=R2C3.LC0
Assigns the location of the element to be one slice below another element in the set that has an RLOC=R2C3.LC1 attribute. (XC5200)
RLOC=R2C3.S0
Assigns the location of the element to be the left-most slice of another element in the set that has an RLOC=R2C3.S1 attribute. (Virtex)
RLOC_ORIGIN=R4C4
Fixes the reference CLB of a designated set at row 4, column 4.
RLOC_RANGE=R4C4 : R10C10
Limits the members of a designated set to a range between row 4, column 4 and row 10, column 10.

A name can be composed of any ASCII character except for control characters and characters that have special meanings.

Control characters are : (colon) ; (semi-colon) , (comma) and “(double quotes).

Characters with special meaning are / (forward slash) used as the hierarchy separator and . (period) used as the pin separator and for extensions.

For additional propagation rules for each constraint and attribute, refer to the “Macro and Net Propagation Rules” table in the "Attributes/Logical Constraints" section.

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