14.11.5 Output Buffers

Names for the bi-directional buffers are composed of up to 4 parts:

  • A base name indicating the type of buffer :OUTBUF
  • Optional IO Technology like LVCMOS
  • An optional number code 8,12,16,24 indicating 1x, 2x, 3x or 4x-drive strength.
  • An optional one character code (S/F) indicating high(F) slew or low(S) slew

OUTBUF_X

Naming convention is identical to the naming for Clock Buffers.

This component is supported by Accelerator families.

Figure 14-502. OUTBUF_X Logic Diagram
  • Function: Output Buffer, High Slew
  • Input: D
  • Output: PAD
Table 14-923. Truth Table
DPAD
00
11
Table 14-924. Truth Table
FamilySeqI/O
All—1
Table 14-925. Available OUTBUF_X Macro Types
NameDescription
OUTBUF_LVCMOS25LVCMOS Output buffer with 2.5 CMOS voltage level
OUTBUF_LVCMOS18LVCMOS Output buffer with 1.8 CMOS voltage level
OUTBUF_LVCMOS15LVCMOS Output buffer with 1.5 CMOS voltage level
OUTBUF_PCIPCI Output buffer
OUTBUF_PCIXPCIX Output buffer
OUTBUF_GTLP25GTLP Output buffer with 2.5 CMOS voltage level
OUTBUF_GTLP33GTLP Output buffer with 3.3 CMOS voltage level
OUTBUF_F_8Output buffer with high slew and 1x drive strength
OUTBUF_F_12Output buffer with high slew and 2x drive strength
OUTBUF_F_16Output buffer with high slew and 3x drive strength
OUTBUF_F_24Output buffer with high slew and 4x drive strength
OUTBUF_S_8Output buffer with low slew and 1x drive strength
OUTBUF_S_12Output buffer with low slew and 2x drive strength
OUTBUF_S_16Output buffer with low slew and 3x drive strength
OUTBUF_S_24Output buffer with low slew and 4x drive strength
OUTBUF_SSTL2_ISSTL Class I Output buffer with 2.5V CMOS Voltage Level
OUTBUF_SSTL2_IISSTL Class II Output buffer with 2.5V CMOS Voltage
OUTBUF_SSTL3_ISSTL Class I Output buffer with 3.3V CMOS Voltage Level
OUTBUF_SSTL3_IISSTL Class II Output buffer with 3.3V CMOS Voltage Level
OUTBUF_HSTL_IHSTL Class I Output buffer with 1.5V CMOS Voltage Level