R
Related Resources
Restoring Default Voltages
Any voltage adjustments are temporary and apply only as long as the 5.0V supply is
connected. To restore the original regulator output voltages, remove and then reconnect
the 5.0V supply input.
Caution! Simply toggling the power switch will not restore the original regulator output voltage!
Remove and reconnect the external 5.0V supply input.
UCF Location Constraints
Figure 17-3 provides the UCF constraints for the I 2 C control signals to the regulators.
# Controls VCCAUX supply rail (IC19)
NET "REG1_SCL" LOC = "E13" | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = SLOW ;
NET "REG1_SDA" LOC = "D13" | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = SLOW ;
# Control D/A Converter reference voltage for Channels C and D (IC18)
NET "REG2_SCL" LOC = "D11" | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = SLOW ;
NET "REG2_SDA" LOC = "F13" | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = SLOW ;
Figure 17-3:
UCF Constraints for Regulator I2C Control Signals
Related Resources
Refer to the following link for additional information:
?
National Semiconductor LP3906 Dual High-Current Step-Down DC/DC and Dual
Linear Regulator with I 2 C Compatible Interface
Spartan-3A/3AN FPGA Starter Kit Board User Guide www.xilinx.com
UG334 (v1.1) June 19, 2008
139
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