Restoring Default Voltages; Ucf Location Constraints; Related Resources - Xilinx Spartan-3A User Manual

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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.

UCF Location Constraints

Figure 17-3

Related Resources

Refer to the following link for additional information:
•
Spartan-3A/3AN Starter Kit Board User Guide
UG334 (v1.0) May 28, 2007
Caution!
Simply toggling the power switch will not restore the original regulator output voltage!
Remove and reconnect the external 5.0V supply input.
provides the UCF constraints for the I
# Controls VCCAUX supply rail (IC19)
NET "REG1_SCL" LOC = "E13" |
NET "REG1_SDA" LOC = "D13" |
# Control D/A Converter reference voltage for Channels C and D (IC18)
NET "REG2_SCL" LOC = "D11" |
NET "REG2_SDA" LOC = "F13" |
Figure 17-3: UCF Constraints for Regulator I2C Control Signals
National Semiconductor LP3906 Dual High-Current Step-Down DC/DC and Dual
Linear Regulator with I
www.national.com/pf/LP/LP3906.html
www.xilinx.com
2
C control signals to the regulators.
IOSTANDARD = LVTTL |
IOSTANDARD = LVTTL |
IOSTANDARD = LVTTL |
IOSTANDARD = LVTTL |
2
C Compatible Interface
Related Resources
DRIVE = 8 | SLEW = QUIETIO ;
DRIVE = 8 | SLEW = QUIETIO ;
DRIVE = 8 | SLEW = QUIETIO ;
DRIVE = 8 | SLEW = QUIETIO ;
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