ino 1 gbps link design
TRANSCRIPT
INO Collaboration Mtg, IIT Madras
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Objective
To demonstrate a point to point 1Gbps communication link over virtex 5 ml507.
To demonstrate a single node to multiple node communication link of same speed.
To design a multiple point to single point communication link.
Performance analysis of the link by eye diagram analysis.
2 March 2015
INO Collaboration Mtg, IIT Madras
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Xilinx Virtex 5 ml507
ML507 is an FXT platform that supports RocketIO GTX transceivers (up to 3.125 Gbps). Assume 4.5 Mbps from each RPC (1x16) x (1x32) x 4.5 Gbps = 2.3 Gbps We will need 10 servers for each half module
Clocking-Programmable system clock generator chipExternal clocking via SMAs (two differential pairs)
2 March 2015
INO Collaboration Mtg, IIT Madras
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Experimental Setup
2 March 2015
Tx and Rx through SMA ports on the Virtex boards
INO Collaboration Mtg, IIT Madras
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Challenges
Pre-emphasis of the transmitter to desired level.
Design the equalization block of the receiver according to the communication link.
Transmitter and receiver clock synchronization and frame detection.
2 March 2015
INO Collaboration Mtg, IIT Madras
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Receiver Equalization
There are two types of equalization techniques that can be implemented in the block.
Continuous Time Linear Equalization and Decision Feedback Equalization
Decision Feedback Equalization has been used.
DFE automatically adapts to time-varying properties of the communication channel.
2 March 2015
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Performance Analysis of Communication Link
Performance analysis of the communication link is done by calculating Q- factor and estimating BER from Q-factor.BER= (½)erfc(Q/ 1.414)
Configuration:1. Point to Point Link.2. Single Transmitter and Multiple Receiver.3. Multiple Transmitter and Single Receiver.
2 March 2015INO Collaboration Mtg, IIT Madras
INO Collaboration Mtg, IIT Madras
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Point to Point Communication Link at Different Data rate
2 March 2015
INO Collaboration Mtg, IIT Madras
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Estimation of BER from Q-Factor
Data Rate Q Value BER Estimation
500 Mbps 6.73 8.5 E -10
750 Mbps 6.53 3.8 E -10
1 Gbps 6.41 7.5 E -09
2 March 2015
INO Collaboration Mtg, IIT Madras
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Estimation of BER from Q-Factor
Network Configuration
Q Value Estimation of BER
Single Transmitter multiple Receiver
5.4 3.44 E-06
Multiple Transmitter single Receiver
6.1 1.2 E -09
2 March 2015
Tx through SMA, T-splitter, Rx also on SMA
INO Collaboration Mtg, IIT Madras
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Future Work
Timing synchronization
Optical Rx (Tx is working)
Live demonstration with (1x16) x (1x32) splitters
RPC DAQ v3 board design SFP instead of Wiznet+RJ45
2 March 2015