The LVDS transmitter pre-emphasis (LVDS_PRE_EMPHASIS) feature allows pre-emphasis on the drivers for certain I/O standards. This attribute must be used with ENABLE_PRE_EMPHASIS.
The allowed values for the LVDS_PRE_EMPHASIS attribute are:
- LVDS_PRE_EMPHASIS = FALSE (Default)
- LVDS_PRE_EMPHASIS = TRUE (where ENABLE_PRE_EMPHASIS must be set to TRUE)
The LVDS_PRE_EMPHASIS attribute uses the following syntax in the XDC file:
set_property LVDS_PRE_EMPHASIS TRUE|FALSE
[get_ports port_name ]
A typical pre-emphasis gain when using the LVDS_PRE_EMPHASIS attribute is listed in the following table.
| Attribute | Value | Estimated Gain (dB) |
|---|---|---|
| LVDS_PRE_EMPHASIS (HP I/O banks only) | TRUE 1 | 4 |
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