XC4VFX12-11FFG668I Xilinx Inc, XC4VFX12-11FFG668I Datasheet - Page 303
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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
3.3V I/O Design Guidelines
R
I/O Standard Design Rules
To achieve maximum performance in Virtex-4 devices, several 3.3V I/O design guidelines
and techniques are highlighted in this section. This includes managing
overshoot/undershoot with termination techniques, regulating V
voltage regulator, using external bus switches, reviewing configuration methods, and
other design considerations.
Overshoot/Undershoot
Undershoot and overshoot voltages on I/Os operating at 3.3V should not exceed the
absolute maximum ratings of –0.3V to 4.05V, respectively, when V
absolute maximum limits are stated in the absolute maximum ratings table in
the
the value of V
different V
The voltage across the gate oxide at any time must not exceed 4.05V. Consider the case in
which the I/O is either an input or a 3-stated buffer as shown in
output PMOS transistor P
ground, respectively.
The amount of undershoot allowed without overstressing the PMOS transistor P
gate voltage minus the gate oxide limit, or V
Similarly, the absolute maximum overshoot allowed without overstressing the NMOS
transistor N
Virtex-4 Data
P
N
Output Driver
o
o
CCO
0
is the gate voltage plus the gate oxide limit, or Ground + 4.05V.
CCO
V
CCO
levels.
Figure 6-78: Virtex-4 FPGA I/O: 3-State Output Driver
Sheet. However, the maximum undershoot value is directly affected by
.
Table 6-38
D
D
G
P
www.xilinx.com
0
Ground
Clamp
Clamp
Power
Diode
Diode
and NMOS transistor N
GND
describes the worst-case undershoot and overshoot at
External
Pin
CCO
– 4.05V.
0
I/O Standards Special Design Rules
is connected essentially to V
Input Buffer
V
CCO
P
N
Figure
i
i
CCO
CCO
6-78. The gate of the
at 3.0V with a
is 3.75V. These
GND
Table 6-38
ug070_6_76_072704
0
CCO
is the
and
303
of
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