Transmitter Pre-Emphasis

UltraScale Architecture SelectIO Resources User Guide (UG571)

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

The transmitter pre-emphasis (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 PRE_EMPHASIS attribute are:

PRE_EMPHASIS = RDRV_NONE (default)

PRE_EMPHASIS = RDRV_240 (where ENABLE_PRE_EMPHASIS must be set to TRUE)

The PRE_EMPHASIS attribute uses the following syntax in the XDC file:

set_property PRE_EMPHASIS value [get_ports port_name]

A typical pre-emphasis gain when using the PRE_EMPHASIS attribute in a DDR4 application with an OUTPUT_IMPEDANCE of 40W is listed in Table: Typical Pre-emphasis Gain when Using the PRE_EMPHASIS Attribute in a DDR4 Application .

Table 1-13:      Typical Pre-emphasis Gain when Using the PRE_EMPHASIS Attribute in a DDR4 Application 

Attribute

Value

Estimated Gain (dB)

PRE_EMPHASIS (HP I/O banks) with an OUTPUT_IMPEDANCE of 40W.

RDRV_240(1)

2.5

Notes:

1.ENABLE_PRE_EMPHASIS must be set to TRUE.