Differential Bidirectional Buffer Primitives

Versal Adaptive SoC SelectIO Resources Architecture Manual (AM010)

Document ID: AM010
Release Date: 2024-03-18
Revision: 1.5 English

Figure 1. Differential Bidirectional Buffer Primitives

Figure 2. Differential Bidirectional DIFF_OUT Buffer Primitives

Table 1. IOBUFDS, IOBUFDS_DIFF_OUT, IOBUFDS_DIFF_OUT_INTERMDISABLE, and IOBUFDS_INTERMDISABLE Attributes
Attribute	Values	Description
SLEW	SLOW, FAST	Specifies the drive strength of the output.
IOSTANDARD	See HD IOB Supported Standards	Assigns an I/O standard to the element.
USE_IBUFDISABLE	FALSE	IBUFDISABLE is not supported in HD IOB and must be set to FALSE. (IOBUFDS_INTERMDISABLE and IOBUFDS_DIFF_OUT_INTERMDISABLE only)

Table 2. IOBUFDS, IOBUFDS_DIFF_OUT, IOBUFDS_DIFF_OUT_INTERMDISABLE, and IOBUFDS_INTERMDISABLE Ports
Port	I/O	Description
IO	Inout	Inout port connection. Connect directly to top-level P side port in the design.
IOB	Inout	Inout port connection. Connect directly to top-level N side port in the design. (IOBUFDS_DIFF_OUT, IOBUF_DIFF_OUT_INTERMDISABLE only)
O	Output	Output path of the buffer representing the input path to the device.
OB	Output	Complimentary buffer output representing the input path to the device. (IOBUFDS_DIFF_OUT, IOBUF_DIFF_OUT_INTERMDISABLE only)
I	Input	Input port connection. Connect directly to top-level P-side port in the design.
T	Input	Tristate enable input signifying whether the buffer acts as an input or output. (IOBUFDS, IOBUFDS_INTERMDISABLE only)
IBUFDISABLE	Input	IBUFDISABLE is not supported in HD IOB. ( IOBUFDS_INTERMDISABLE, IOBUFDS_DIFF_OUT_INTERMDISABLE only)
INTERMDISABLE	Input	Control to enable/disable DCI termination. This is generally used to reduce power in long periods of an idle state. (IOBUFDS_INTERMDISABLE, IOBUFDS_DIFF_OUT_INTERMDISABLE only)
TM	Input	Tristate enable input for the P-side or master side signifying whether the buffer acts as an input or output. This pin must be connected to the same signal as the TS input. (IOBUFDS_DIFF_OUT, IOBUFDS_DIFF_OUT_INTERMDISABLE only)
TS	Input	Tristate enable input for the N-side or slave side signifying whether the buffer acts as an input or output. This pin must be connected to the same signal as the TM input. (IOBUFDS_DIFF_OUT and IOBUFDS_DIFF_OUT_INTERMDISABLE only)