7 Series FPGAs SelectIO Resources User Guide www.xilinx.com 55
UG471 (v1.5) May 15, 2015
Supported I/O Standards and Terminations
Figure 1-40 shows a bidirectional, parallel-terminated topology.
Table 1-12 details the allowed attributes that can be applied to the LVCMOS33 and
LVCMOS25 I/O standards. These standards are only available in the HR I/O banks.
Table 1-13 details the allowed attributes that can be applied to the LVCMOS18 I/O
standard. This standard is available in both the HR and HP I/O banks.
X-Ref Target - Figure 1-40
Figure 1-40: LVCMOS Bidirectional Termination
Table 1-12: Allowed Attributes for the LVCMOS33 and LVCMOS25 I/O Standards
Attributes
Primitives
IBUF/IBUFG OBUF/OBUFT/ IOBUF
IOSTANDARD LVCMOS33, LVCMOS25 LVCMOS33, LVCMOS25
DRIVE N/A 4, 8, 12, 16
SLEW N/A {FAST, SLOW}
Table 1-13: Allowed Attributes for the LVCMOS18 I/O Standard
Attributes
Primitives
IBUF/IBUFG
OBUF/OBUFT/IOBUF
HP I/O Banks HR I/O Banks
IOSTANDARD LVCMOS18 LVCMOS18 LVCMOS18
DRIVE N/A 2, 4, 6, 8, 12, 16 4, 8, 12, 16, 24
SLEW N/A {FAST, SLOW} {FAST, SLOW}
Z
0
IOB
IOB
LVCMOS
Z
0
IOB
IOB
LVCMOS LVCMOS
V
TT
Note: V
TT
is any voltage from 0V to V
CCO
R
P
= Z
0
V
TT
R
P
= Z
0
ug471_c1_30_011811
LVCMOS
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