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| 型号： | HW-V5-ML555-G |
| 厂商： | Xilinx Inc |
| 文件页数： | 61/108页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR VIRTEX-5 ML555 |
| 产品培训模块： | PCI Express and Virtex® -5 FPGAs |
| 标准包装： | 1 |
| 系列： | Virtex® -5 |
| 类型： | FPGA |
| 适用于相关产品： | Virtex?-5 FPGA |
| 所含物品： | 板，线缆，CD |
| 配用： | HW-AFX-SMA-SFP-ND - CONVERSION MODULE SMA - SFP HW-AFX-SMA-SATA-ND - CONVERSION MODULE SMA - SATA HW-AFX-SMA-RJ45-ND - CONVERSION MODULE SMA - RJ45 HW-AFX-SMA-HSSDC2-ND - CONVERSION MODULE SMA - HSSDC2 HW-AFX-BERG-EPHY-ND - DAUGHTER CARD PHY BERG-EPHY |
| 相关产品： | XC5VFX70T-1FF1136CES-ND - IC FPGAVIRTEX5FX ES 70K 1136FBGA XC5VLX85T-3FF1136C-ND - IC FPGA VIRTEX-5 85K 1136FBGA XC5VLX85T-2FF1136I-ND - IC FPGA VIRTEX-5 85K 1136FBGA XC5VLX85T-2FF1136C-ND - IC FPGA VIRTEX-5 85K 1136FBGA XC5VLX85T-1FF1136I-ND - IC FPGA VIRTEX-5 85K 1136FBGA XC5VLX85T-1FF1136C-ND - IC FPGA VIRTEX-5 85K 1136FBGA XC5VLX50T-3FF1136C-ND - IC FPGA VIRTEX-5 50K 1136FBGA XC5VLX50T-2FF1136I-ND - IC FPGA VIRTEX-5 50K 1136FBGA XC5VLX50T-2FF1136C-ND - IC FPGA VIRTEX-5 50K 1136FBGA XC5VLX50T-1FF1136I-ND - IC FPGA VIRTEX-5 50K 1136FBGA 更多... |
| 其它名称： | 122-1586 HW-V5-ML555-G-ND |
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R
Clock Generation
Clock Synthesizers
The ML555 board contains two clock synthesizer circuits that support a wide range of
frequency synthesis capabilities for end-user applications. One of the clock synthesizers
should be used to generate the clock for the DDR2 SODIMM memory. The second clock
synthesizer can be used to generate the reference clock for the GTP transceivers. Two
Integrated Circuit Systems (ICS) ICS8442 Crystal Oscillator to Differential LVDS
Frequency Synthesizer devices are on the board, each with a different crystal oscillator
reference clock.
The ICS8442 device has the following features:
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Dual differential LVDS outputs
Output frequency range: 31.25 MHz to 700 MHz
Crystal input frequency range: 10 MHz to 25 MHz
VCO operating range: 250 MHz to 700 MHz
Parallel or serial interface for programming multiplier and output dividers
RMS period jitter: 2.7 ps (typical)
Cycle to cycle jitter: 18 ps (typical)
The complete data sheet for the ICS8442 device is available online at
The synthesizer multiplies the reference clock input by a selectable multiplier. The VCO
operates (locks) in a range from 250 to 700 MHz. The VCO output is routed through a
programmable divider to generate the desired output frequency. The supported VCO
frequency divisors are 1, 2, 4, or 8. The resultant clock from the divisor block is then routed
to differential output drivers.
The clock synthesizer can be programmed in either parallel or serial mode. Parallel mode
requires the user to set two DIP switches on the ML555 board, and then press and release a
pushbutton switch to load the desired configuration into the ICS8442 . Serial configuration is
accomplished using the FPGA to transmit serial data, clock, and controls to the
synthesizer. A reference design to program the ICS clock synthesizers using the FPGA to
ICS8442 serial configuration interface is provided on the reference CD-ROM included with
the ML555 kit.
The output frequency of the synthesizer is M times the input reference clock frequency,
provided that the internal VCO is locked. An eight-position DIP switch selects the
multiplier value, M. M can be any decimal value from 0 to 511. There are values of M
where the VCO will not obtain frequency lock. The relationship between the input clock
(F XTAL ) and the VCO frequency is given by the equation:
F VCO = F XTAL X M
The VCO can be divided by an integer value 1, 2, 4, or 8 using the DIP switches as shown
The frequency output of the clock synthesizer is given by the equation:
F OUT = F VCO /N = F XTAL X M/N (provided the VCO is locked)
Virtex-5 FPGA ML555 Development Kit
UG201 (v1.4) March 10, 2008
61
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| HW-V5-ML561-UNI-G | EVALUATION PLATFORM VIRTEX-5 |
| I-JET | JTAG ARM DEBUGGING PROBE |
| IAC24A | INPUT MODULE AC 5MA 24VDC |
| IAC5EQ | INPUT MODULE AC 10MA 5VDC |
| IB8RM | SURGE SUPP 8OUT 12'CORD W/REMOTE |
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