Xilinx MIcroblaze Development Spartan-3E 1600E - Manual (Page 75)

MicroBlaze Development Kit Spartan-3E 1600 Edition User Guide 73
UG257 (v1.1) December 5, 2007 www.xilinx.com
UCF Location Constraints R
DAC Outputs C and D
Equation 9-3 provides the output voltage equation for DAC outputs A and B. The
reference voltage associated with DAC outputs A and B is 2.5V r 5%.
Equation 9-3
UCF Location Constraints
Figure 9-5 provides the UCF constraints for the DAC interface, including the I/O pin
assignment and the I/O standard used.
Related Resources
x LTC2624 Quad DAC Data Sheet
x http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1155,C1005,C1156,
P2048,D2170
x PicoBlaze Based D/A Converter Control for the Spartan-3E Starter Kit (Reference
Design)
x http://www.xilinx.com/sp3e1600e
x Xilinx PicoBlaze Soft Processor
x http://www.xilinx.com/picoblaze
x Digilent, Inc. Peripheral Modules
http://www.digilentinc.com/Products/Catalog.cfm?Nav1=Products&
Nav2=Peripheral&Cat=Peripheral
V
OUTC
D 11:0 > @
4096 
--------------------- 2.5V 5% r u =
Figure 9-5: UCF Location Constraints for the DAC Interface
NET "SPI_MISO" LOC = "N10" | IOSTANDARD = LVCMOS33 ;
NET "SPI_MOSI" LOC = "T4" | IOSTANDARD = LVCMOS33 | SLEW = SLOW | DRIVE = 8 ;
NET "SPI_SCK" LOC = "U16" | IOSTANDARD = LVCMOS33 | SLEW = SLOW | DRIVE = 8 ;
NET "DAC_CS" LOC = "N8" | IOSTANDARD = LVCMOS33 | SLEW = SLOW | DRIVE = 8 ;
NET "DAC_CLR" LOC = "P8" | IOSTANDARD = LVCMOS33 | SLEW = SLOW | DRIVE = 8 ;
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