A chain of register primitives can be converted to a logically equivalent SRL primitive using the REG_TO_SRL property with a value of true. This transform is typically used to reduce the number of pipeline register stages used by signals to traverse long distances within a device. Having too many register stages can create congestion or other placement problems.
- Architecture Support
- All architectures.
- Applicable Objects
- Cells (
get_cells) as leaf level register instances - Values
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True(or 1): The Vivado logic optimization will convert the specified register primitives into an SRL. -
False(or 0): The Vivado logic optimization will not convert the specified register primitives into an SRL.
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Syntax
- Verilog Syntax
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Not applicable
- VHDL Syntax
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Not applicable
- XDC Syntax
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set_property REG_TO_SRL <True | False> <objects>The property is false by default. The objects should be registers, and the registers to be absorbed into the same SRL should share the same control set with no reset.
XDC Example:
set_property REG_TO_SRL 1 [get_cells {cell1 cell2}]
Affected Steps
- Opt Design