Buffer Primitives

Buffer primitives allow you to do the following:

  • Make a location assignment
  • Make an I/O standard assignment
  • Make a drive strength (current strength) assignment
  • Make a slow slew rate assignment
  • Enable bus-hold circuitry
  • Enable a weak pull-up resistor
  • Make an on-chip termination assignment to a bidirectional pin from a lower-level entity

The following buffer primitives are available:

  • ALT_BIDIR_BUF
  • ALT_BIDIR_DIFF
  • ALT_INBUF
  • ALT_INBUF_DIFF
  • ALT_IOBUF
  • ALT_IOBUF_DIFF
  • ALT_OUTBUF
  • ALT_OUTBUF_DIFF
  • ALT_OUTBUF_TRI
  • ALT_OUTBUF_TRI_DIFF
  • CARRY_SUM
  • CASCADE
  • EXP
  • GLOBAL
  • LCELL
  • LUT_INPUT
  • LUT_OUTPUT
  • OPNDRN
  • SOFT
  • TRI
  • WIRE