Download - FTK Rear Transition Card

1

FTK Rear Transition Card

Mircea Bogdan

The University of Chicago

March 12, 2013

Board Review

Mircea Bogdan, March 12, 2013 2


9U VME Rear Transition Card

I/Os:

-2 x QSFP (8 x RxTx @ 6Gbps)

-1 x SFP (1 x RxTx @ 2Gbps)

-P3 Connector: - 12 x Out @ 2Gbps

- 16 x In @ 2Gbps

-P2 Connector:

- VME: Data, Addr, Aux

- HOLDs to Input FPGAs (4+8)

- HOLDs from Processor FPGAs (4x4)

- FREEZE In, Out

Block Diagram



Power Requirement Estimate (4 Processor FPGAs, 4 RLDRAMs, 2 Input FPGAs):

-Power consumption per Processor FPGA ~ 12W

-Power consumption per Input FPGA ~ 3 W

-Total Power Consumption Estimate ~ 70-75 W per card

Power Supply Issues

Supply Options per Slot (Front Modules DO NOT draw any +5V current):

1.P2/P0: +5V rated for 18.5/11.5A (20C/70C), total: 57.5W to 92.5W.

2.P0: Vw, Vx, Vy, Vz: at +5V rated each for 4A/3A (20C/70C), total: 60W to 80W.

3.Option 1 and 2 combined: total: 117.5W to 172.5W.

4.P0: Vw, Vx, Vy, Vz: at +15V rated each for 4A/3A (20C/70C), i.e. 180W to 240W total.



Routing:

- HS lines:- routed between ground planes, 6mil width, 4 mil gap, 100Ohm, reduced number of vias, ground return vias, first plane cut-out under AC caps, matched length in pair.

- LVTTL lines: separate layers, 4 mil width, 50Ohm.

- 2 Oz Copper on 1.1V POWER_1.



Attenuation = 2.3 f (tand) sqrt(er)

er tandAttenuation at 2.5Gbps[dB/inch]

Signal Loss 16” - 2.5Gbps

[dB]

Attenuation at 7Gbps[dB/inch]

Signal Loss 4” - 7Gbps

[dB]

Cost 150 pc

FR4 4.8 0.02 0.126 2.016 0.35 1.4 $21K

N4000-13EP 3.7 0.009 0.049 0.784 0.14 0.56 $34K

N4000-13EPSI 3.2 0.008 0.041 0.656 0.11 0.44 $38K

Rogers 4350B 3.48 0.0037 0.02 0.32 0.06 0.22

Material Selection

Max trace length: 16” for 2Gbps, 4” for 6Gbps

Note: The first AUX Test Card, made with FR4, has max trace length 12” for 2Gbps: Signal Loss = 1.6dB.