参数资料
型号: HW-SPAR3A-SK-UNI-G
厂商: Xilinx Inc
文件页数: 82/143页
文件大小: 0K
描述: KIT STARTER W/SPARTAN-3A
产品培训模块: FPGAs Spartan3
产品变化通告: Adapter Replacement 23/May/2008
标准包装: 1
系列: Spartan®-3A
类型: FPGA
适用于相关产品: Spartan?3A FPGA,XC3S700A-FG484
所含物品: 板,线缆,文档,电源
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其它名称: 122-1514
Chapter 10: Analog Capture Circuit
ADC_OUT
Slave: LTC1407A-1 A/D Converter
R
Spartan-3A
FPGA
Master
AD_CONV
SPI_SCK
Z
D 0 D 1 D 2 D 3 D 4 D 5 D 6 D 7 D 8 D 9 D 10 D 11 D 12 D 13
Channel 1
Z
D 0 D 1 D 2 D 3 D 4 D 5 D 6 D 7 D 8 D 9 D 10 D 11 D 12 D 13
Channel 0
Z
Converted data is presented with a latency of one sample.
The sampled analog value is converted to digital data 32 SPI_SCK cycles after asserting AD_CONV.
AD_CONV
SPI_SCK
Sample
point
The converted values is then presented after the next AD_CONV pulse.
Sample
point
ADC_OUT
Channel 0
13
0
Channel 1
13
0
Channel 0
13
UG330_c10_05_032007
Figure 10-6: Analog-to-Digital Conversion Interface
Figure 10-7 shows detailed transaction timing. The AD_CONV signal is not a traditional
SPI slave select enable. Be sure to provide enough SPI_SCK clock cycles so that the ADC
leaves the ADC_OUT signal in the high-impedance state. As shown in Figure 10-6 , use a
34-cycle communications sequence. The ADC 3-states its data output for two clock cycles
before and after each 14-bit data transfer.
4ns min
AD_CONV
3ns
19.6ns min
SPI_SCK
1
2
3
4
5
6
8ns
ADC_OUT
High-Z
Channel 0
13
12
11
AD_CONV
45ns min
SPI_SCK
ADC_OUT
30
Channel 1
3
2
31
1
32
0
33
6ns
34
High-Z
The A/D converter sets its SDO output line to high impedance after 33 SPI_SCK clock cycles
UG330_c10_06_032007
Figure 10-7:
Detailed SPI Timing to ADC
UCF Location Constraints
Figure 10-8 provides theUser Constraint File(UCF)constraints for the amplifier interface,
including the I/O pin assignment and I/O standard used.
NET "AD_CONV"
NET "SPI_SCK"
NET "AD_DOUT"
LOC = "Y6" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 4 ;
LOC = "AA20" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 12 ;
LOC = "D16" | IOSTANDARD = LVTTL ;
Figure 10-8:
UCF Location Constraints for the ADC Interface
82
Spartan-3A FPGA Starter Kit Board User Guide
UG330 (v1.3) June 21, 2007
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