XC4VFX40-11FFG672I Xilinx Inc, XC4VFX40-11FFG672I Datasheet - Page 401
XC4VFX40-11FFG672I
Manufacturer Part Number
XC4VFX40-11FFG672I
Description
IC FPGA VIRTEX-4 FX 40K 672-FBGA
Manufacturer
Xilinx Inc
Series
Virtex™-4r
Specifications of XC4VFX40-11FFG672I
Number Of Logic Elements/cells
41904
Number Of Labs/clbs
4656
Total Ram Bits
2654208
Number Of I /o
352
Voltage - Supply
1.14 V ~ 1.26 V
Mounting Type
Surface Mount
Operating Temperature
-40°C ~ 100°C
Package / Case
672-BBGA, FCBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Number Of Gates
-
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Temperature Sensing Diode
Temperature-Sensing Diode (TDP/TDN)
Virtex-4 FPGA User Guide
UG070 (v2.6) December 1, 2008
Temperature Sensor Examples
R
Maxim Remote/Local Temperature Sensors
The Virtex®-4 FPGA temperature-sensing diode is accessible through the TDP (anode) and
TDN (cathode) pins. The TDP and TDN pins are wired internally to a diode-connected
transistor, which creates a remote temperature sensor.
TDP and TDN are dedicated pins attached to the substrate/die and cannot be accessed
through the software tools. TDP and TDN are always available, and no special design is
necessary. The TDP and TDN pins are unconnected when this feature is not used.
The temperature-sensing diode is one part of a two-part system. A temperature sensor
interface device is also required. Most temperature sensor interface devices provide
corresponding pins to connect directly to the Virtex-4 FPGA TDP and TDN pins. Once the
upper and lower temperature limits are set, an output signal is created when these bounds
are exceeded. This output can be an interrupt to turn off the clock, turn on a fan, or perform
another operation to reduce heat.
The accuracy of the temperature measurement achieved by this two-part system does not
depend on the temperature-sensing diode (TDN/TDP pins). The voltage-versus-
temperature curve is determined by the physical nature of the diode. Numerical readout
accuracy relies on the temperature sensor interface device to translate the IV-versus-
temperature curves into an actual temperature reading. The accuracy specifications are
listed in the specific temperature sensor data sheets.
General information on these devices is available from Maxim at:
Links to the specific data sheets for these devices:
•
•
•
The PC Board Layout section of these data sheets include important design considerations.
http://www.maxim-ic.com.
http://pdfserv.maxim-ic.com/ds/en/MAX1617.pdf
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3000
http://pdfserv.maxim-ic.com/en/ds/MAX6627-MAX6628.pdf
www.xilinx.com
Chapter 9
401
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