Transcript Progress on L1Cal at Nevis Outline 1. RoI Pathologies 2. Communications Paths

Progress on L1Cal at Nevis
H. Evans
for the Nevis group
Outline
1. RoI Pathologies
2. Communications Paths
3. Latency
H. Evans
Run2b L1Cal Meeting: 30-May-02
1
Local Maxima Finding
Et Grid Input
Local Max Finding
uses RoI Grid
H. Evans
RoI Output (3x3)





Naming LM Algo’s (Declustering)





1.
min separation of LMs









2.
 data required





3.
RoI’s used
Run2b L1Cal Meeting: 30-May-02
2
The RoI Definition Matters
Declust = 3x3
Declust = 5x5
RoI = 3x3
RoI = 2x2
Conclusion: 2x2 RoI size better matched to asymmetric declustering
(but still not perfect)
H. Evans
Run2b L1Cal Meeting: 30-May-02
3
Different RoIs the in MC?
ZH   b b w/ 0.5 min - bias
Two Jet Trigger
Eff
Single Jet Trigger
Et > 25 GeV
other pts in steps of 1 GeV
Et > 20
GeV
RoI – Decluster
2x2 – 3x3
2x2 – 5x5
3x3 – 5x5
3x3 – 3x3
Bgrd Rate [Hz]
J. Mitrevski
• Warning: study still preliminary
• Similar behavior (but less pronounced) in WH and tt
• General Conclusions
– 2x2 RoI more robust than 3x3 to cluster position shifts
– 2x2 RoI performance at least as good as 3x3 in MC
H. Evans
Run2b L1Cal Meeting: 30-May-02
4
Links in the TAB and GAB
Timing
Input
Digital
Filter
ADF
8-bits
L2
G-Link
Xmit
Channel Link Deserializers/Resynch
L3
(VRB)
12-bits
Sliding Windows Chips
L2/L3
Buffer
Monitor
Buffer
Global Sums +
Reformat
VME Interface
Timing
Interface
SLDB
Xmit
Xmit
TAB
Cal-Trk
Match
CPU
L2
Rcvr
Timing
+ Cntrl
Monitor
Buffer
VME Interface
GAB
Framework
H. Evans
G-Link
Xmit
Sums +
Reformat
ECL
Drive
Term Rcvr
Module
L3
(VRB)
L2/L3
Buffer
SCLR
Ser. Link
Fanout
Run2b L1Cal Meeting: 30-May-02
Geo Sector
5
L1Cal Communications
1. ADF to TAB
–
–
4. L2/L3 Data
assuming Channel Link
serializers/deserializers
need to finalize
timing/integrity bits

c.f. Denis’ presentation
2. Serial Command Link
–
–
–
GAB fans out
timing/control
choose sub-set of
signals required for TAB
final decision on ADF
timing source
3. Trigger Output to
Framework
–
–
H. Evans
hardware required
first pass set of And-Or
terms
– define data for L2,
optimize timing
5. Cal-Track Match
– for each phi-slice send 2
8-bit words


EM: highest cluster Et &
count of no. of clust’s in
slice
Jet: highest cluster Et &
count of no. of clust’s in
slice
– optimize the no. of bits
allocated to Et/count
6. Downloading/Monitoring
– define what is necessary
Run2b L1Cal Meeting: 30-May-02
6
Latency
L1CAL & CAL-TRK LATENCY
updated
22-May-02
Step
Bunch Crossing
Transmit to ADF
BC to ADF
sub-total
ADF
ADC
Filter
Cable to TAB
sub-total
TAB
Resynch inputs
Pipelined logic
Serialize Slide Win out
Ex,y calculations
Serialize output
SLDB to MTCal data ready
sub-total
CAL-TRK
MTCal to MTCM SLDB
SLDB to TFW
sub-total
TOTAL
TFW decision due
Difference
H. Evans
delta-t (ns) cumul-t (ns)
0
0
Notes
650
650
650
650
TDR - measured
165
660
132
957
815
1475
1607
1607
Calvet Talk - 16-May-02
cable delay included in Xmit to ADF
132
110
132
132
132
861
1499
1739
1849
1981
2113
2245
3106
3106
TDR - L1Cal section
544
0
544
3650
3650
3650
3650
3300
350
TDR - measured
assumes no MTM for Cal-Trk
TDR - measured
Run2b L1Cal Meeting: 30-May-02
7