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Chapter 1:
SelectIO Resources
X-Ref Target - Figure 1-21
The IBUFDS_IBUFDISABLE 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. This feature can be used to reduce power whenever
the I/O is idle.
IBUFDS_INTERMDISABLE
The IBUFDS_INTERMDISABLE primitive shown in
banks and is similar to the IBUFDS_IBUFDISABLE primitive in that it has an
IBUFDISABLE port that can be used to disable the input buffer during periods that the
buffer is not being used. The IBUFDS_INTERMDISABLE primitive also has an
INTERMDISABLE port that can be used to disable the optional uncalibrated
split-termination feature. See
(IN_TERM)
X-Ref Target - Figure 1-22
The IBUFDS_INTERMDISABLE primitive can disable the input buffer and force the
O output to the fabric High when the USE_IBUFDISABLE attribute is set to TRUE and the
IBUFDISABLE signal is asserted High. If USE_IBUFDISABLE is set to FALSE, the
IBUFDISABLE input is ignored and should be tied to ground. If the I/O is using the
optional uncalibrated split-termination feature (IN_TERM), this primitive disables the
termination legs whenever the INTERMDISABLE signal is asserted High. These features
can both be combined to reduce power whenever the input is idle.
IBUFDS_DIFF_OUT_INTERMDISABLE
The IBUFDS_DIFF_OUT_ INTERMDISABLE primitive shown in
in the HR I/O banks and is similar to the IBUFDS_IBUFDISABLE primitive in that it has an
38
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IBUFDISABLE
Figure 1-21: Differential Input Buffer With Input Buffer Disable
for more details on this feature.
INTERMDISABLE
IBUFDISABLE
Figure 1-22: Differential Input Buffer With Input Buffer Disable and IN_TERM
Disable (IBUFDS_INTERMDISABLE)
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IBUFDS_IBUFDISABLE
I
IB
(IBUFDS_IBUFDISABLE)
Figure 1-22
Uncalibrated Split Termination in High-Range I/O Banks
IBUFDS_INTERMDISABLE
I
IB
7 Series FPGAs SelectIO Resources User Guide
O
UG471_c1_65_041412
is available in the HR I/O
O
UG471_c1_66_021214
Figure 1-23
is available
UG471 (v1.10) May 8, 2018
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