Obuf; Obufds - Xilinx SelectIO 7 Series User Manual

split-termination feature. See
(IN_TERM)
X-Ref Target - Figure 1-32
The IOBUFDS_INTERMDISABLE 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 optional uncalibrated
split-termination feature (IN_TERM), those termination legs are disabled whenever the
driver is active (T is low). This primitive further allows the termination legs to be disabled
whenever the INTERMDISABLE signal is asserted High. These features can be combined
to reduce power whenever the input is idle for a period of time.

OBUF

An output buffer (OBUF) must be used to drive signals from 7 series devices to external
output pads. A generic 7 series FPGA OBUF primitive is shown in
X-Ref Target - Figure 1-33

OBUFDS

Figure 1-34
7 Series FPGAs SelectIO Resources User Guide
UG471 (v1.10) May 8, 2018
Uncalibrated Split Termination in High-Range I/O Banks
for more details on this feature.
IOBUFDS_INTERMDISABLE
IBUFDISABLE
INTERMDISABLE
Figure 1-32: Differential Bidirectional Buffer With Input Buffer Disable and
IN_TERM Disable (IOBUFDS_INTERMDISABLE)
I (Input)
From FPGA
Figure 1-33: Output Buffer Primitive (OBUF)
shows the differential output buffer primitive.
www.xilinx.com
7 Series FPGA SelectIO Primitives
T
I
O
OBUF
ug471_c1_18_011811
IO
IOB
UG471_c1_68_021214
Figure 1-33.
O (Output)
to device pad
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