XC4VFX12-11FFG668I Xilinx Inc, XC4VFX12-11FFG668I Datasheet - Page 257
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XC4VFX12-11FFG668I
Manufacturer Part Number
XC4VFX12-11FFG668I
Description
IC FPGA VIRTEX-4 FX 12K 668FCBGA
Manufacturer
Xilinx Inc
Series
Virtex™-4r
Specifications of XC4VFX12-11FFG668I
Number Of Logic Elements/cells
12312
Number Of Labs/clbs
1368
Total Ram Bits
663552
Number Of I /o
320
Voltage - Supply
1.14 V ~ 1.26 V
Mounting Type
Surface Mount
Operating Temperature
-40°C ~ 100°C
Package / Case
668-BBGA, FCBGA
For Use With
HW-V4-ML403-UNI-G - EVALUATION PLATFORM VIRTEX-4HW-AFX-FF668-400 - BOARD DEV VIRTEX 4 FF668
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Number Of Gates
-
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Virtex-4 FPGA User Guide
UG070 (v2.6) December 1, 2008
R
LVDCI (Low Voltage Digitally Controlled Impedance)
Table 6-4
LVCMOS15 I/O standards.
Table 6-4: Allowed Attributes for the LVCMOS18 and LVCMOS15 I/O Standard
Using these I/O buffers configures the outputs as controlled impedance drivers. The
receiver of LVDCI is identical to a LVCMOS receiver. Some I/O standards, such as LVTTL,
LVCMOS, etc., must have a drive impedance that matches the characteristic impedance of
the driven line. Virtex-4 devices provide a controlled impedance output driver to provide
series termination without external source termination resistors. The impedance is set by
the common external reference resistors, with resistance equal to the trace characteristic
impedance, Z
Sample circuits illustrating both unidirectional and bidirectional termination techniques
for a controlled impedance driver are shown in
standards supporting a controlled impedance driver are: LVDCI_15, LVDCI_18,
LVDCI_25, and LVDCI_33.
IOSTANDARD
CAPACITANCE
DRIVE
SLEW
Figure 6-29: Controlled Impedance Driver with Unidirectional Termination
Figure 6-30: Controlled Impedance Driver with Bidirectional Termination
Attributes
R 0 = R VRN = R VRP = Z 0
details the allowed attributes that can be applied to the LVCMOS18 and
LVDCI
0
.
R 0 = R VRN = R VRP = Z 0
LVDCI
Specific Guidelines for Virtex-4 FPGA I/O Supported Standards
www.xilinx.com
IBUF/IBUFG
LVCMOS18
LVCMOS15
IOB
IOB
UNUSED
UNUSED
LOW, NORMAL, DONT_CARE
Z 0
Z 0
Figure 6-29
OBUF/OBUFT
2, 4, 6, 8, 12, 16
{FAST, SLOW}
LVCMOS18
LVCMOS15
Primitives
IOB
IOB
R 0 = R VRN = R VRP = Z 0
and
Figure
LVDCI
UG070_6_29_031308
6-30. The DCI I/O
LVDCI
2, 4, 6, 8, 12, 16
{FAST, SLOW}
UG070_6_30_031308
LVCMOS18
LVCMOS15
IOBUF
257
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