14.11.1 Axcelerator Input IO Macros

Names for the input buffers are composed of up to 4 parts:

  • A base name indicating the type of buffer :INBUF
  • IO Technology like LVCMOS
  • An optional number code 33,25,18 or 15 indicating a 3.3, 2.5, 1.8 OR 1.5 voltage level.
  • An optional one character code (U/D) designating a pull-up/down resistor. When the buffer has no resistor, this code is omitted.

For Example:

  • INBUF_LVCMOS25U - An input LVCMOS buffer with 2.5 CMOS voltage levels, pull-up resistor.
  • INBUF_PCIX - An input PCIX buffer

INBUF_X

This component is supported by Accelerator families.

Figure 14-498. INBUF_X Logic Diagram
  • Function: Global Input Buffer
  • Input: PAD
  • Output: Y
Table 14-911. Truth Table
PADY
00
11
Table 14-912. Modules
FamilySeqI/O
All listed—1
Table 14-913. Available INBUF_X Macro Types
NameDescription
INBUFLVTTL Input buffer with 3.3v voltage level
INBUF_LVCMOS25LVCMOS Input buffer with 2.5 CMOS voltage level
INBUF_LVCMOS25ULVCMOS Input buffer with 2.5 CMOS voltage level, pull-up resistor
INBUF_LVCMOS25DLVCMOS Input buffer with 2.5 CMOS voltage level, pull-down resistor
INBUF_LVCMOS18LVCMOS Input buffer with 1.8 CMOS voltage level
INBUF_LVCMOS18ULVCMOS Input buffer with 1.8 CMOS voltage level, pull-up resistor
INBUF_LVCMOS18DLVCMOS Input buffer with 1.8 CMOS voltage level, pull-down resistor
INBUF_LVCMOS15LVCMOS Input buffer with 1.5 CMOS voltage level
INBUF_LVCMOS15ULVCMOS Input buffer with 1.5 CMOS voltage level, pull-up resistor
INBUF_LVCMOS15DLVCMOS Input buffer with 1.5 CMOS voltage level, pull-down resistor
INBUF_PCIPCI Input buffer
INBUF_PCIXPCIX Input buffer
INBUF_GTLP25GTLP Input buffer with 3.3 CMOS voltage level
INBUF_GTLP33GTLP Input buffer with 2.5 CMOS voltage level
INBUF_ HSTL _IHSTL Class I Input buffer
INBUF_SSTL2_ISSTL2 Class I Input buffer
INBUF_SSTL2_IISSTL2 Class II Input buffer
INBUF_SSTL3_ISSTL3 Class I Input buffer
INBUF_SSTL3_IISSTL3 Class II Input buffer