Iobufds_Diff_Out - Xilinx SelectIO 7 Series User Manual

Chapter 1: SelectIO Resources
X-Ref Target - Figure 1-28
The IOBUFDS_DCIEN primitive can disable the input buffer and force the O output to the
fabric to a logic High when the USE_IBUFDISABLE attribute is set to TRUE and the
IBUFDISABLE signal is asserted High. If USE_IBUFDISABLE is set to FALSE, this input is
ignored and should be tied to ground. If the I/O is using the split-termination DCI feature,
this primitive disables the termination legs whenever the DCITERMDISABLE signal is
asserted High. Only the 3-state DCI I/O standards can be used on bidirectional signals.
With 3-state DCI I/O standards, the DCI termination legs turn off whenever the driver is
active. The IOBUFDS_DCIEN primitive further allows the termination legs to be disabled
whenever the DCITERMDISABLE signal is asserted High. These features can be combined
to reduce power whenever the input is idle for a period of time.

IOBUFDS_DIFF_OUT

Figure 1-29
outputs (O and OB). This primitive is only recommended for use by experienced Xilinx
designers with memory interface applications. A logic High on the T pin disables the
output buffer.
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IBUFDISABLE
DCITERMDISABLE
Figure 1-28: Differential Bidirectional Buffer With Input Path Disable and DCI
shows the differential input/output buffer primitive with complementary
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IOBUFDS_DCIEN
T
I
O
Disable (IOBUFDS_DCIEN)
7 Series FPGAs SelectIO Resources User Guide
IO
IOB
UG471_c1_69_021214
UG471 (v1.10) May 8, 2018