参数资料
型号: HW-SPAR3A-SK-UNI-G
厂商: Xilinx Inc
文件页数: 80/143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
Table 10-2:
Programmable Gain Settings for Pre-Amplifier (Continued)
R
A3
A2
A1
A0
Input Voltage Range
Gain
B3
B2
B1
B0
Minimum
Maximum
-5
-10
-20
-50
-100
0
0
0
0
0
0
1
1
1
1
1
0
0
1
1
1
0
1
0
1
1.4
1.525
1.5875
1.625
1.6375
1.9
1.775
1.7125
1.675
1.6625
SPI Control Interface
Figure 10-3 highlights the SPI-based communications interface with the amplifier. The gain
for each amplifier is sent as an eight-bit command word, consisting of two four-bit fields.
The most-significant bit, B3, is sent first.
AMP_DOUT
0
Slave: LTC2624-1
7
SPI_MOSI
A 0 A 1 A 2 A 3 B 0 B 1 B 2 B 3
Spartan-3A
AMP_CS
FPGA
Master
SPI_SCK
A Gain
B Gain
UG330_c10_03_071906
Figure 10-3: SPI Serial Interface to Amplifier
The AMP_DOUT output from the amplifier echoes the previous gain settings. These
values can be ignored for most applications.
The SPI bus transaction starts when the FPGA asserts AMP_CS Low (see Figure 10-4 ). The
amplifier captures serial data on SPI_MOSI on the rising edge of the SPI_SCK clock signal.
The amplifier presents serial data on AMP_DOUT on the falling edge of SPI_SCK.
AMP_CS
SPI_SCK
30
30
50
50
SPI_MOSI
7
6
5
4
3
2
(from FPGA)
85 max
AMP_DOUT
Previous 7
6
5
4
3
2
(from AMP)
All timing is minimum in nanoseconds unless otherwise noted.
UG230_c10_04_022306
Figure 10-4:
SPI Timing When Communicating with Amplifier
80
Spartan-3A FPGA Starter Kit Board User Guide
UG330 (v1.3) June 21, 2007
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