Xilinx virtex-5 fpga - Page 289

Virtex-5 FPGA User Guide www.xilinx.com 289
UG190 (v5.0) June 19, 2009
Specific Guidelines for I/O Supported Standards
X-Ref Target - Figure 6-81
Figure 6-81: SSTL (1.8V) Class II Termination
Z
0
IOB
SSTL18_II
ug190_6_76_071707
V
TT
= 0.9V
R
P
= Z
0
= 50Ω
V
TT
= 0.9V
R
P
= Z
0
= 50Ω
Z
0
IOB
IOB
SSTL18_II_DCI
SSTL18_II_DCI
V
CCO
= 1.8V
2R
VRP
= 2Z
0
= 100Ω
2R
VRN
= 2Z
0
= 100Ω
V
REF
= 0.9V
+
–
V
REF
= 0.9V
+
–
External Termination
DCI
V
CCO
= 1.8V
2R
VRP
= 2Z
0
= 100Ω
2R
VRN
= 2Z
0
= 100Ω
IOB
SSTL18_II
R
S
= 20Ω R
S
= 20Ω
R
0
= 20Ω
V
REF
= 0.9V
V
REF
= 0.9V
R
0
= 20Ω