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Kay Rehlich
xTCA Workshop @ RT2012
MicroTCA.4 Timing Distribution andPower Supply Issues
MicroTCA.4 Timing Distribution
Outline 2
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
MicroTCA.4 connectivity: Precision clocks Bussed clocks and triggers PCIe, Ethernet, SRIO Point-to-point links
Power supply issues Noise measurements Grounding
Conclusions
MicroTCA.4 Timing Distribution
3
MicroTCA.4 Timing Distribution
Motivation 3
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
Backplane
Ethernet To Timing Distribution
MicroTCA.4 Timing Distribution
MTCA.4: Connectivity 4
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
2 radial clocks per AMC:
low jitter, configurable direction
8 bussed M-LVDS lines:
triggers, clocks and interlocks
Backplane
Ethernet (1) and PCIe (4)
Point-2-point:
SATA (2)
FPGA-2-FPGA (4)
Point-2-point:
SATA (2)
FPGA-2-FPGA (4)
Ter
min
atio
n
Ter
min
atio
n
MicroTCA.4 Timing Distribution
5
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
MicroTCA.4 Timing Distribution
Radial Clocks 7
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
B
ackp
lane
AMC ksender
MCH. . .
Cro
ssp
oint
Sw
itch
AMC nreceiver
AMC mreceiver
Clock
Gen.
. . .
• Point-to-point
• High precision(some ps jitter)
• Both ends terminated
• Any AMC can be sender
• With one MCH:TCLKA and TCLKB usable
• FCLK for PCIe
• Low jitter MCH in preparation
ADC
ADC
MicroTCA.4 Timing Distribution
8 M-LVDS Lines: Trigger & Gate Distribution 8
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
B
ackp
lane
AMC ksender
. . .
AMC nreceiver
AMC mreceiver
Trigger
Gen.
. . .
FPGAFPGA
FPGAFPGA
L
H
H
One AMC is Master per line
Other AMCs can receive
All differential lines are terminated
on both ends of the backplane
MicroTCA.4 Timing Distribution
8 M-LVDS Lines: Interlock Distribution 9
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
B
ackp
lane
AMC ksender
. . .
AMC nSender/receiver
AMC mreceiver
Interlock
Gen.
. . .FPGAFPGA
H
Interlock
Gen.
H
AMC can be Driver only
AMC can be Receiver only
AMC can be Driver andReceiver
MicroTCA.4 Timing Distribution
8 M-LVDS Lines: Data Distribution 10
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
B
ackp
lane
AMC ksender
. . .
AMC mreceiver
FPGAFPGA
Data
Gen.
Data
Clock
Data
Clock
D0 D1 D2 D3
Data
Clock: e.g. 108 MHz
Other AMCs can receive
For lower speeds one single diff. line is enough
MicroTCA.4 Timing Distribution
Point-to-Point Communication Links 11
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
B
ackp
lane
AMC k
AMC m
FPGA
Rx
Tx
Bi-directional ports
Several Gbps speed
Rx
Tx
FPGA
MicroTCA.4 Timing Distribution
Clock and Trigger Transmission 12
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
LVDS
M-LVDS Trigger distribution
Radial Clockdistribution
Transition times: 1 ns
Rate: <= 500 Mbps
Rate: <= 2 Gbps
MicroTCA.4 Timing Distribution
M-LVDS Specs 13
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
Drives: 100 Ohm 2 * 100 Ohm parallel termination
Required for Interlocks (wired-or)
MicroTCA.4 Timing Distribution
XFEL Timing System: 1. Prototype
New timing system• Fiber optic links 1.3GHz • with drift compensation• AMC prototype is receiver
and transmitter• ps stability (< 5ps RMS)• Clock, trigger and
event distribution
14
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
1.3GHz
Clock
Data
MicroTCA.4 Timing Distribution
A Timing System to Sync the Overall Facility
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
15
Receiver
Switch
Divider8 line
M-LVDS
4* RJ45:
4 * LVDSI/O
9 * LVDS
Out
FPGA
3 channel transmitter piggyback
PCIe
Ext. 1.3 GHz ref clock in
Opt
ion
al R
TM
:
9 tr
ansm
itter
s, t
rigg
ers
or c
lock
s
TCLKA, TCLKB
IN
O
UT
O
UT
O
UT
Fib
er o
ptic
s
PCB:In Progress
Piggyback:ready
MicroTCA.4 Timing Distribution
Signal Quality and Power Supplies 16
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
MicroTCA.4 Timing Distribution
MicroTCA Analog Performance 17
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
ADC
With RTM:
RMS= 5.86 bits
ENOB ~ 11.5
w/o RTM:
RMS= 4.9 bits
ENOB ~ 11.7
Open transformer:
RMS= 67.7 μV
2.22 bits
ENOB ~ 12.7
SIS8900 RTM
SIS8300
16 bit ADC
MicroTCA.4 Timing Distribution
Grounding 18
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
220 Volt in
=
≈
ADC
Linear reg.
12 Volt DC
DC/DC
chassis
≈
AMC
MicroTCA.4 Timing Distribution
Understanding Distortions 19
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
© Frank Ludwig, DESY
MicroTCA.4 Timing Distribution
SIS8300 ADC with 1.3 GHz Down Converter 20
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
Frequency spectrum with bad power supply Frequency spectrum with good power supply
MicroTCA.4 Timing Distribution
600 W Just ready
1200 W in 2012
Managed Power Supplies 21
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
new new Ready this Aug.
Noisy 48 V DC in
© Wiener
MicroTCA.4 Timing Distribution
Conclusions
MicroTCA.4 offers a variety of connectivity
Radial switched clocks
Bussed signaling for triggers and data
Point-to-point links
MicroTCA.4 provides very clean data acquisition
One power supply only showed high frequency noise
o Excellent performance with fast 16 bit ADCs
22
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
MicroTCA.4 Timing Distribution
Thank you! 23
Kay Rehlich, DESY (FLASH + XFEL Controls) MTCA.4 Timing Distribution, xTCA Workshop @ RT2012
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