Sundance SMT712 - Manual (Page 14)

User Manual SMT712 Page 14 of 89 Last Edited: 11/12/2012 10:36:00
Each DAC has a heat sink to help the heat dissipation.
4.5.2
FPGA
4.5.2.1 General Description
The FPGA fitted as standard on the SMT712 is part of the Virtex5 LXT family:
XC5VLX110T. The package used is FFG1136 and the speed grade -3 (fastest part).
For more information about the LXT family, you can visit the Xilinx website.
It is fitted with a heatsink coupled with a fan to keep it within an appropriate range
of temperature (no more than 85 ºC) when using the default firmware provided.
Nevertheless the board requires some forced cooling. It is recommended to use a
PXIe-1062Q chassis or equivalent from National instrument as it already integrates a
built-in regulated cooling system. Measurements have been made using a PXIe-
1062Q on the maximum fan speed setting and the standard firmware with both
DACs clocked at 2,3GHz:
In an ambient temperature of 25 ºC, the FPGA die temperature stays close to 60 ºC.
In an ambient temperature of 30 ºC, the FPGA die temperature stays close to 70 ºC.
In order to improve the heat dissipation is a system, some slot blockers can be used
(from National Instrument), which redirect the air flow of non-used slots to where it
is needed.
4.5.2.2 Resources used – XCV5FX70T.
Below is a summary (ISE11.4) of the resources used in the FPGA by the default
firmware (Standard SMT712-FX70T):
Slice Logic Utilization:
Number of Slice Registers: 19,258 out of 44,800 42%
Number used as Flip Flops: 19,251
Number used as Latches: 1
Number used as Latch-thrus: 6
Number of Slice LUTs: 13,781 out of 44,800 30%
Number used as logic: 13,160 out of 44,800 29%
Number using O6 output only: 12,075
Number using O5 output only: 457
Number using O5 and O6: 628
Number used as Memory: 417 out of 13,120 3%
Number used as Dual Port RAM: 308
Number using O6 output only: 204
Number using O5 output only: 20
Number using O5 and O6: 84
Number used as Shift Register: 109
Number using O6 output only: 109
Number used as exclusive route-thru: 204
Number of route-thrus: 924
Number using O6 output only: 656
Number using O5 output only: 264
Number using O5 and O6: 4
Slice Logic Distribution:
Number of occupied Slices: 7,245 out of 11,200 64%
Number of LUT Flip Flop pairs used: 22,949
Number with an unused Flip Flop: 3,691 out of 22,949 16%
Number with an unused LUT: 9,168 out of 22,949 39%
Number of fully used LUT-FF pairs: 10,090 out of 22,949 43%