参数资料
型号: HW-SPAR3AN-SK-UNI-G
厂商: Xilinx Inc
文件页数: 74/140页
文件大小: 0K
描述: KIT STARTER SPARTAN-3 AN
产品变化通告: Adapter Replacement 23/May/2008
标准包装: 1
系列: Spartan®-3AN
类型: FPGA
适用于相关产品: Spartan-3AN XC3S700AN-FG484,XCF04S-VOG20C
所含物品: 面板、缆线、软件、数据表和用户手册
相关产品: XC3S700AN-5FGG484C-ND - IC FPGA SPARTAN-3A 700K 484-FBGA
122-1598-ND - IC FPGA SPARTAN -3AN700K 484FBGA
122-1556-ND - IC SPARTAN-3AN FPGA 700K 484FBGA
其它名称: 122-1528
HW-SPAR3AN-SK-UNI-G-PROMO
HW-SPAR3AN-SK-UNI-G-PROMO-ND
Chapter 9: Analog Capture Circuit
Table 9-2:
Programmable Gain Settings for Pre-Amplifier (Continued)
R
Gain
A3
B3
A2
B2
A1
B1
A0
B0
Input Voltage Range
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 9-3 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
FPGA
AMP_CS
Master
SPI_SCK
A Gain
B Gain
UG334_c9_03_052407
Figure 9-3:
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 9-4 ). 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 9-4: SPI Timing When Communicating with Amplifier
The amplifier interface is relatively slow, supporting only about a 10 MHz clock frequency.
74
www.xilinx.com Spartan-3A/3AN FPGA Starter Kit Board User Guide
UG334 (v1.1) June 19, 2008
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