LVDS12_LVAUX - LVDS12_LVAUX

LVDS12_LVAUX is intended to provide a 1.2V standard compatible with LVDS standards. See the LVDS and LVDS_25 section in UltraScale Architecture SelectIO Resources User Guide (UG571) for information on how LVDS standards typically function. The differences between LVDS12_LVAUX and LVDS are highlighted in this section.

LVDS12_LVAUX requires V_CCO = 1.2V.
LVDS12_LVAUX only supports a DQS_BIAS value of FALSE.
LVDS12_LVAUX only supports a DIFF_TERM value of TRUE. When using LVDS12_LVAUX, you must explicitly set the DIFF_TERM to TRUE because the default value is FALSE. This automatically maps the DIFF_TERM_ADV attribute to TERM_100.
LVDS12_LVAUX has internal differential termination (100Ω) that is turned on by default when in 3-state/receiving mode for OBUFTDS, IBUFDS, and IOBUFDS. LVDS12_LVAUX does not have a driving mode.
LVDS12_LVAUX is only available in HP I/O banks.
AC coupled common mode (V_{ICM_AC}) is not supported by the LVDS12_LVAUX I/O standard.

Table 1. LVDS12_LVAUX Allowed Attributes
Attributes	Primitives
	IBUFDS		OBUFDS
	HP I/O Banks		HP I/O Banks
	Allowed Values	Default	Allowed Values	Default
IOSTANDARD	LVDS12_LVAUX		LVDS12_LVAUX
EQUALIZATION	EQ_NONE	EQ_NONE	N/A
DQS_BIAS	FALSE	FALSE	N/A
DIFF_TERM	TRUE	FALSE¹	N/A
DIFF_TERM_ADV	TERM_100	TERM_NONE¹	N/A
You must explicitly change DIFF_TERM to TRUE. This automatically maps DIFF_TERM_ADV to TERM_100.

Table 2. Internal Differential Termination Behavior
Primitives	Driving	3-state/Receiving
OBUFDS	N/A	N/A
OBUFTDS	N/A	Internal differential termination is ON.
IBUFDS	N/A	When DIFF_TERM = TRUE or DIFF_TERM_ADV = TERM_100, internal differential termination is ON. This is the only allowed behavior. DIFF_TERM is not allowed to be set to FALSE. You must explicitly set DIFF_TERM to TRUE.
IOBUFDS	N/A	Internal differential termination is ON, irrespective of the DIFF_TERM or DIFF_TERM_ADV attributes.

LVDS12_LVAUX - LVDS12_LVAUX - UG584

Using LVAUX Mode in XQ Ruggedized UltraScale+ Devices for Airborne Systems Design Guide (UG584)