Source synchronous lvds xilinx download

Source synchronous design techniques are commonly used methods of data transfer. Highspeed serial adcs send data at very high rates. View xapp585 lvds source synchserdesclockmultiplication. Sourcesynchronous clocking refers to a technique used for timing symbols on a digital interface. This paper proposed the design and implementation of high speed communication link between two fpgas using lvds driver using 100 mhz clock. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Virtex6 fpga lvds 4x asynchronous oversampling at 1. A single dnvuf1a is configured with a single virtex ultrascale xcvu440 and can. Iserdes and oserdes guidelines each spartan6 fpga inputoutput block iob contains a 4bit input serdes and a 4bit output serdes. Design guidelines for implementing lvds interfaces in cyclone series devices.

The stratix dedicated serdes optimized performance circuitry and its predictable timing provide the designer with a reliable implementation for high speed, source synchronous lvds channels operating at up to 840mbs. A deserializer instantiated in the fabric of the fpga could not keep up with these high data rates. You can download the reference design files for this application note. At the receiver, the clock after synchronization is used to capture the data. The dnv6f6pcie is hosted in a 4lane pci express bus gen1, but can be used standalone and configured via usb or ethernet. Hello, we use several source synchronous lvds based interfaces in several pc designs. Xilinx xapp707 advanced chipsync applications application note. Source synchronous optimizations include perbit deskew, data serializerdeserializer, clock dividers, and dedicated local clocking resources. Introduction asynchronous data capture allows data to be ca ptured when using differential inputs like lvds without a forwarded clock as commonly used in synchronous interfaces.

This means that an lvds clock is transmitted in parallel with one or more data bit streams on other lvds channels. The dnv7f1a is a standalone system and can be hosted by 4lane pcie cable gen1, usb or ethernet. This is facilitated by the low channeltochannel and parttopart skew of the adn4650. Virtex5 fpga ml550 networking interfaces platform xilinx. One piso block is triggered off the rising edge of clk4x, while the other is. Download the reference design files for this application note from the xilinx website. The piso block is instantiated twice in each outstage. Typical multichannel adc with a serial lvds interface 6 understanding serial lvds capture in highspeedadcs sbaa205 july 20. This answer record contains the steps to resolve this for a core generated in a bd design.

The dnv6f6pcie is a complete logic prototyping system that enables asic or ip designers to prototype logic and memory designs for a fraction of the cost of existing solutions. Fpga to fpga interconnect is routed as lvds, but can be used singleended at a reduced frequency. A single dnv7f1a configured with a single virtex7, 7v2000t can emulate up to 14. Initially asynchronous and synchronous communication are. The reference design files are available for download at. The goal is to transmit deformatted tester data stored in fifo from the communication card using a low voltage differential. Ug0645 user guide low voltage differential signaling 7. Together with xilinx, the worlds leading provider of programmable platforms, analog devices develops industryleading analog solutions to complement fpga systems.

Citeseerx document details isaac councill, lee giles, pradeep teregowda. The mds is a collection of software, firmware, and hardware that provide the digital stimulus to maxims rf dacs that employ parallel, multiplexed lvds data interfaces. The dnv7f1a is a complete logic prototyping system that enables asic or ip designers a vehicle to prototype logic and memory designs for a fraction of the cost of existing solutions. Design guidelines for implementing lvds interfaces. The receiver rx also requires 16 lvds pairs for data and one lvds pair for the source synchronous clock input. Hello, we use several source synchronous lvds based interfaces in several pc designs, such as a unidirectional interface from several multichannel ad fpga ondie lvds termination issues fpga groups. Lattice has a reference design available for this 7. This application note describes a 16channel, source synchronous lvds interface operating at double data rate ddr. Understanding serial lvds capture in highspeed adcs. Specifically, it refers to the technique of having the transmitting device send a clock signal along with the data signals. The timing of the unidirectional data signals is referenced to the clock often called the strobe sourced by the same device that generates those signals, and not to a. I have not been able to find a suitable reference design or application note.

For detailed information about the design files, see reference design. When data is sent without a clock, it is known as asynchronous data. Virtexii ios are designed to comply with the ieee electrical specifications for lvds to make system and board design easier. What i like to do on xilinx devices is to use a ddr output primitive to invert the clock. The intel quartus prime software automatically configures the clock switch, clock tap, sclk, and row clock multiplexers to generate skewbalanced clock trees. A latency of one clock cycle is achievable endtoend, so the multiplexing essentially becomes invisible to the asic design. Sourcesynchronous optimizations include perbit deskew, data serializerdeserializer, clock dividers, and dedicated local clocking resources. A typical multichannel device has one or two lvds pairs per adc channel, one common bit clock output, and one frame clock output. Gty connections between fpgas allows for high bandwidth data movement fpga to fpga. The base idea behind the interface, is to send a copy of the clock along with the data, and in this way simplify the timing model of the interface. Xilinx xapp524 serial lvds highspeed adc interface, application. Refer to figure 12for the lvds output interface of an 8channel adc device.

For detailed information about the design files, see. Kintex7 fpga to an adc with highspeed, serial lvds outputs. Since this interface is source synchronous, the clock must also be. Different techniques are required when the clock and data are center aligned. Based on this versatile lvds circuit and our robust plls and cdr architecture we developed multiple unidirectional and bidirectional parallel source synchronous interfaces for chipchip and video data transmission. Source synchronous clocking lookup technology solutions march 3rd, 2016.

Fpga design flow page 3 july 20 altera corporation an 479. Since this interface is source synchronous, the clock must also be forwarded using the oddr module. Source synchronous clocking refers to a technique used for timing symbols on a digital interface. This article contains a full description of the system, including requirements, design, hardware, and software descriptions, as.

For axi ethernet generated in ip catalog, please refer to xilinx answer 63914. Using lvds for microsemi axcelerator and rtaxs devices 4 data sampling window whenever data is transmitted using the lvds io, a reference clock that is source synchronous with the lvds data stream is either regenerated at the receiver using a phased locked loop pll or transmitted with the data stream. Analogtodigital converter adc interfaces typically utilize source synchronous data transmission with lvds. When using axi ethernet on an ultrascale device with sgmii over lvds, synchronous sgmii is not stable. Source synchronous interface design with fpgas analog. Contribute to analogdevicesinchdl development by creating an account on github. Applications such as channel link, flat panel display link fpdlink, and camera link use lvds interface for physical layer. Dini group dnvupf4a virtex ultrascale plus, asic prototyping. A single dnv6f6pcie configured with 6 xilinx virtex6.

This lvds io is highly programmable and is an excellent io for fpga to asic conversions. Hello, we use several source synchronous lvds based interfaces in several pcb designs, such as a unidirectional interface from several multichannel adc devices ti ads725x towards fpga xilinx virtex4 family, sx subfamily, or a fullduplex interface between highend dsp devices adi adspts201s and fpga xilinx virtex4 family, fx subfamily. Using lvds io introduction low voltage differential signaling lvds is a very popular and powerful highspeed interface in many system applications. If the rx clk is toggling during the rx rst or is not clean when it starts after an rx rst, then bit slipping and channel word alignment are required on the rx side to ensure alignment across. R 16channel, ddr lvds interface with perchannel alignment. The advantages of pci104s high bandwidth along with the versatile fpga architecture allows users to create a high speed data interface and control solution that is uniquely suited to each individual application. The method used consists of oversampling the data with a clock of similar frequency 100 ppm. In this example, all 8 serial data lanes are being used. For detailed information about the design files, see reference design files, page 9. Analog for xilinx fpgas introduction introduction texas instruments ti is the approved and tested vendor of analog solutions for xilinx fpgas and cplds. The clas12 data acquisition system was designed and built as part of the clas12 detector project in hall b at jefferson laboratory.

This means that the clock is transmitted on one differential channel and the data on one or several other differential pairs. The resulting routing path distributes the signal from the clock source to all target destinations in one or more clock sectors. The adc outputs provide sample data by way of one source synchronous lvds clock and four lvds ddr data lanes. Design of a high speed lvds bus interface using fpga. The virtex5 contains primitives designed specifically for highspeed, source synchronous deserialization, but as supported by xilinx, can only support bitwidths of 10. For detailed information about the design files, see asynchronous reference design. Design of a high speed lvds bus interface using fpga anu s ram dept. For those without eagle, you can download pdf versions of the schematic and layout. A lvds source synchronous serialization and deserialization data transmission is proposed. An asynchronous data capture scheme is the focus of this application note. Design of highspeed lvds data communication link using fpga.

The performance rates of these adcs range from 40 msps to 70 msps. Xilinx virtex4 outputs for camera link showing 119 of 19 messages. Create source synchronous interfaces using the high speed selectio wizard. Source synchronous interface is a common interface type on chiptochip communication. The transmitter tx requires 16 lvds pairs for data and one lvds pair for the forwarded clock. Highspeed, multichannel serial adc lvds interface for. Xilinx expressly disclaims any warranty whatsoever with respect to the adequacy of the impleme ntation, including but not limited to any warranties. I think the camera link requires a lvds io standard. Configurable logic blocks clbs, the basic logic elements for xilinx fpgas, provide combinatorial and synchronous logic as well as distributed memory and.

The dnvuf1a is a standalone system and can be hosted by a 4lane pcie cable gen3, usb or ethernet. In cases where the clock of source synchronous interface is not routed through a clock capable pin the dpa receive mode cant be used. I am interfacing an analog devices ad9219 40 msps adc to our spartan6 lx45 fpga. Dini group dnvuf1a virtex ultrascale, asic prototyping. Based on the direction of clock and data, synchronous systems are categorized in to two as source synchronous and system synchronous. The eagle libraries i used to make this board are available in my eaglelbr mercurial repository or directly download a zip file. Xilinx xapp860 16channel, ddr lvds interface with realtime. Ibis model of the xilinx lvds receiver, and needed to be added manually. Lvds source synchronous ddr deserialization up to 1,600 mbs author. Sourcesynchronous design techniques are commonly used methods of data transfer.

Design,of,a,high,speed, lvds,bus,interface,using,fpga. Note that the frequency of the serial clock is exactly 4 times the frequency of the system clock. The dnvuf1a is a complete logic prototyping system that enables asic or ip designers a vehicle to prototype logic and memory designs for a fraction of the cost of existing solutions. Dini group asic prototyping engine featuring xilinx. Introduction page 5 may 2016 altera corporation an 433. I do not care about the absolute delay from the internal clock to the. Broadcast video support code for lvds interface sdi serdes. Our network synchronizer clocks lead the industry in jitter performance while offering low power consumption and are ideally suited for syncesonetsdh timing card and pizza box applications, as well as 5g wireless communication systems and data center switches. Instantiation below is a verilog example for instantiating these modules in the source code. Certain output standards, such as lvds, are only available on the. Easy interface and connectivity of adi components to xilinx fpgas is enabled through the use of fmc boards, fmc interposers, and pmods. Native highspeed io interfaces application note xilinx.

This is similar to how video pixel data is transmitted. After this, the rxclk can be started, however it must be started cleanly. Each transition of the clock indicates a change in the state of a data line. Hi, is there a way to make work lvds data receive in the fpga with source synchronous clock forwarded clok but, at lack of available fpga cc pin, is connected to non clock pin. Freeformpci 104 is a reconfigurable fpga development board with high speed digital io that combines a user programmable fpga with a 32bit, 33mhz pci104 interface. I have a source synchronous lvds ddr output from a virtex7. Citeseerx r 16channel, ddr lvds interface with per. Constraining and analyzing sourcesynchronous interfaces figure 6 shows the setup relationships analyzed by.