CTLE Equalization
For challenging high-speed links, the X5IO IOB receiver provides several different levels of equalization designed to increase the eye opening for LVDS12, DIFF_LVSTL_11, DIFF_LVSTL06_12, DIFF_LVSTL05_10, DIFF_POD12, DIFF_POD11, DIFF_POD10, LVSTL_11, LVSTL06_12, LVSTL05_10, LVDS05_10_HS, POD12, POD11, POD10, MIPI_DPHY, and MIPI_CPHY interfaces. When equalization is used on an LVDS12 interface, it is recommended that the link be AC-coupled.
The CTLE_EQ attribute uses the following syntax in the XDC file:
set_property CTLE_EQ VALUE [get_ports port_name]| Value | Estimated Gain (dB) | |||
|---|---|---|---|---|
| CTLE_EQ_LEVEL0, CTLE_EQ_LEVEL1, CTLE_EQ_LEVEL2, CTLE_EQ_LEVEL3, CTLE_EQ_LEVEL4, CTLE_EQ_LEVEL5, CTLE_EQ_LEVEL6, CTLE_EQ_LEVEL7, CTLE_EQ_LEVEL8 | TBD | |||
Pre-Emphasis
For high-speed interfaces on lossy channels, the X5IO IOB driver provides pre-emphasis for LVDS_12, LVSTL_11, LVSTL06_12, POD12, POD11, and POD10 drivers. In order to use pre-emphasis, the serializer must be used and the LVDS_PRE_EMPHASIS or PRE_EMPHASIS_M/PRE_EMPHAISS_S attribute must be set on the X5PHIO_XCVR_X2 UNISIM. Pre-emphasis is not supported when the serializer is bypassed. When equalization is used on an LVDS12 interface, it is recommended that the link be AC-coupled.
| Attribute | Value | Estimated Gain (dB) |
|---|---|---|
| LVDS_PRE_EMPHASIS with an OUTPUT_IMPEDANCE of 40Ω | RDRV_240 | 2.5 |
| PRE_EMPHASIS_M/PRE_EMPHASIS_S with an OUTPUT_IMPEDANCE of 40Ω | RDRV_240 | 2.5 |