LVDS Transmitter Pre-Emphasis

UltraScale Architecture SelectIO Resources User Guide (UG571)

Document ID
UG571
Release Date
2022-08-31
Revision
1.14 English

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 in conjunction 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 Table: Typical Pre-Emphasis Gain when Using the LVDS_PRE_EMPHASIS Attribute .

Table 1-14:      Typical Pre-Emphasis Gain when Using the LVDS_PRE_EMPHASIS Attribute 

Attribute

Value

Estimated Gain (dB)

LVDS_PRE_EMPHASIS (HP I/O banks)

TRUE(1)

4

LVDS_PRE_EMPHASIS (HR I/O banks)

TRUE(1)

4

Notes:

1.ENABLE_PRE_EMPHASIS must be set to TRUE.