Progress of the FELIX Demonstrator Testing H. Chen, K. Chen, S. - PowerPoint PPT Presentation

Progress of the FELIX Demonstrator Testing H. Chen, K. Chen, S. Tang August 29, 2019

Progress 4 PCBs were received on early July. ● 1 board was assembled at AATech. ● Verified functions: ● DC-DC modules in 3 power-on stages. ○ PCIe Gen3 bifurcation with x8x8 ○ 12-ch duplex Finisar BOA configurations, and IBERT test for the PCIe bus with PCIe loopback card. DDR4 Quick test of DDR4. ○ IBERT test for optical modules. ○ 12-ch FireFly Transmitter (x2) and Receiver (x2) 12-ch duplex FCI/Amphenol OBT module (x2) Finisar BOA has modules with this package 4-ch duplex FireFly module Kai Chen (BNL) 2

Test of the PCIe Bus The slot supporting bifurcation for the ● test is configured to be x8x8: No correctable or uncorrectable error ● for both endpoints in one day’s testing. IBERT test with PCIe Loopback card ● PRBS-31, 1E-9 ○ IBERT test for 8 Gbps (PCIe Gen3) ○ For one tested channel: ~24000, ■ 76.47%, w/o DFE (decision feedback equalization). IBERT test for 16 Gbps is run for 3 hours, ○ no error occur for all lanes (with DFE enabled). Kai Chen (BNL) 3

Preliminary Test of the DDR4 Module: A4k16q28bnpbse from ATP Quick test is carried out with speed of 2.1 GT/s. Margin is enough for write and read operations in all Ranks & Bytes. Kai Chen (BNL) 4

IBERT Test All eye diagram scans are configured with with: ● PRBS-31 ○ BER: 1E-9 ○ Kai Chen (BNL) 5

IBERT Test of the 25G Duplex FireFly Module 4-ch in one module are tested, averaged results: Open area: 9632 ● UI%: 63.89% ● No special configuration for ● the module. 9344, 66.67% Kai Chen (BNL) 6

IBERT Test of the 16G FireFly Module 12-ch from one Transmitter module to one Receiver module are tested, averaged results: Open area: 4954 ● UI% 54.63% ● No special configuration for the ● modules. No error for more than 2x10 15 bits ● Will ask Samtec to get 25G ● modules for testing 4928, 55.55% Kai Chen (BNL) 7

IBERT Test of the 25G Duplex OBT module 20-ch are tested, the averaged results are: Open area: 9286.4 ● UI%: 61.67% ● No other special ● configuration for the module. Another 4-ch can run ● at 25G once the clock 9088, 55.56%, chip is configured. CDR is enabled for both TX and RX channels Kai Chen (BNL) 8

IBERT Test of the 25G Duplex BOA module 12-ch in one module are tested, averaged results: Open area: 7163 ● UI%: 48.15 ● No special configuration for the ● module. Looks like the width of eye ● diagram is worse than OBT and 7232, 44.44% FireFly No heatsink for current test ● Kai Chen (BNL) 9

Comparison of the Eye Diagram Test Results Module Tested Link Speed Open Area UI% Power (W) Channels 4-ch 25G Duplex FireFly 4 25 Gbps 9632 63.89% Nom=1.7 Max=2.5 12-ch 16G FireFly Tx/Rx 12 15.9375 Gbps 4954 54.63% 12-ch 25G Duplex OBT 20 25 Gbps 9286.4 61.67% Nom=5.8 Max=7.9 12-ch 25G Duplex BOA 12 25 Gbps 7163 48.15% Nom=6 Max=7.3 Kai Chen (BNL) 10

Summary The test verified the power scheme on new FELIX demonstrator. ● The stack-up, layout & route work well for 25G+ links. ● The performance of different modules (no special configuration to all ● modules) are measured: Preliminary test shows OBT and FireFly have better performance ○ Verified bifurcation without PCIe switch ● Quick test shows the DDR4 works well; the margin is enough for the ● R/W operations. Will continue the test, to verify all functions: e.g. jitter measurement for ● clock chips; QSPI multiboot to support selection of different firmwares. Kai Chen (BNL) 11