14.11.2 Bi-Directional IO Macros
Names for the bi-directional buffers are composed of up to 4 parts:
- A base name indicating the type of buffer :BIBUF
- 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
- 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:
- BIBUF_LVCMOS25 - A bi-directional LVCMOS buffer with 2.5 CMOS voltage levels, pull-up resis-tor
- BIBUF_S_8- A bi-directional buffer with low slew and 1x drive strengt
BIBUF_X
This component is supported by Accelerator families.
- Function: Bidirectional Buffer, High Slew (with Hidden Buffer at Y pin).
- Input: D, E, PAD
- Output: Y, PAD
| MODE | E | D | PAD | Y |
|---|---|---|---|---|
| OUTPUT | 1 | X | D | D |
| INPUT | 0 | X | X | PAD |
| Family | Seq | I/O |
|---|---|---|
| All | — | 1 |
| Name | Description |
|---|---|
| BIBUF_LVCMOS25 | LVCMOS Bi-directional buffer with 2.5 CMOS voltage level |
| BIBUF_LVCMOS25U | LVCMOS Bi-directional buffer with 2.5 CMOS voltage level, pull-up resistor |
| BIBUF_LVCMOS25D | LVCMOS Bi-directional buffer with 2.5 CMOS voltage level, pull-down resistor |
| BIBUF_LVCMOS18 | LVCMOS Bi-directional buffer with 1.8 CMOS voltage level |
| BIBUF_LVCMOS18U | LVCMOS Bi-directional buffer with 1.8 CMOS voltage level, pull-up resistor |
| BIBUF_LVCMOS18D | LVCMOS Bi-directional buffer with 1.8 CMOS voltage level, pull-down resistor |
| BIBUF_LVCMOS15 | LVCMOS Bi-directional buffer with 1.5 CMOS voltage level |
| BIBUF_LVCMOS15U | LVCMOS Bi-directional buffer with 1.5 CMOS voltage level, pull-up resistor |
| BIBUF_LVCMOS15D | LVCMOS Bi-directional buffer with 1.5 CMOS voltage level, pull-down resistor |
| BIBUF_PCI | PCI Bi-directional buffer |
| BIBUF_PCIX | PCIX Bi-directional buffer |
| BIBUF_GTLP25 | GTLP Bi-directional buffer with 2.5 CMOS voltage level |
| BIBUF_GTLP33 | GTLP Bi-directional buffer with 3.3 CMOS voltage level |
| BIBUF_F_8 | Bi-directional buffer with high slew and 1x drive strength |
| BIBUF_F_8U | Bi-directional buffer with high slew and 1x drive strength, pull-up resistor |
| BIBUF_F_8U | Bi-directional buffer with high slew and 1x drive strength, pull-down resistor |
| BIBUF_F_12 | Bi-directional buffer with high slew and 2x drive strength |
| BIBUF_F_12U | Bi-directional buffer with high slew and 2x drive strength, pull-up resistor |
| BIBUF_F_12D | Bi-directional buffer with high slew and 2x drive strength, pull-down resistor |
| BIBUF_F_16 | Bi-directional buffer with high slew and 3x drive strength |
| BIBUF_F_16U | Bi-directional buffer with high slew and 3x drive strength, pull-up resistor |
| BIBUF_F_16D | Bi-directional buffer with high slew and 3x drive strength, pull-down resistor |
| BIBUF_F_24 | Bi-directional buffer with high slew and 4x drive strength |
| BIBUF_F_24U | Bi-directional buffer with high slew and 4x drive strength, pull-up resistor |
| BIBUF_F_24D | Bi-directional buffer with high slew and 4x drive strength, pull-down resistor |
| BIBUF_S_8 | Bi-directional buffer with low slew and 1x drive strength |
| BIBUF_S_8U | Bi-directional buffer with low slew and 1x drive strength, pull-up resistor |
| BIBUF_S_8U | Bi-directional buffer with low slew and 1x drive strength, pull-down resistor |
| BIBUF_S_12 | Bi-directional buffer with low slew and 2x drive strength |
| BIBUF_S_12U | Bi-directional buffer with low slew and 2x drive strength, pull-up resistor |
| BIBUF_S_12D | Bi-directional buffer with low slew and 2x drive strength, pull-down resistor |
| BIBUF_S_16 | Bi-directional buffer with low slew and 3x drive strength |
| BIBUF_S_16U | Bi-directional buffer with low slew and 3x drive strength, pull-up resistor |
| BIBUF_S_16D | Bi-directional buffer with low slew and 3x drive strength, pull-down resistor |
| BIBUF_S_24 | Bi-directional buffer with low slew and 4x drive strength |
| BIBUF_S_24U | Bi-directional buffer with low slew and 4x drive strength, pull-up resistor |
| BIBUF_S_24D | Bi-directional buffer with low slew and 4x drive strength, pull-down resistor |
| BIBUF_SSTL2_I | SSTL2 Class I Bi-directional buffer with 2.5V CMOS Voltage Level |
| BIBUF_SSTL2_II | SSTL2 Class II Bi-directional buffer with 2.5V CMOS Voltage Level |
| BIBUF_SSTL3_I | SSTL3 Class I Bi-directional buffer with 3.3V CMOS Voltage Level |
| BIBUF_SSTL3_II | SSTL3 Class II Bi-directional buffer with 3.3V CMOS Voltage Level |
| BIBUF_HSTL_I | HSTL Class I Bi-directional buffer with 1.5V CMOS Voltage Level |