COOR Parameters for L1Cal: Draft 0

updated: 24-Aug-05

Index

1. Glossary of terms
2. Parameters loaded to the TAB Chips 0-9
3. Parameters loaded to the TAB Chips 10
4. Parameters loaded to the GAB

Glossary

• n: number of objects
• t: threshold number (1-7 in TAB, 1-6 in GAB)
• t_a: threshold number for Acop Jet (1-6 in GAB)
• t_v: threshold number for Acop Jet Veto (1-6 in GAB)
• emi: EM-Isolation parameter
• emf: EM/Had parameter
• thr_adcsq: energy threshold in ADC counts squared for MEt
• thr_et: energy threshold in ADC counts for Sum Et
• eta_sum = eta region over which MEt/Et sums are constructed
• cut = cut on Et of TT to enter sum
  • currently (25-Aug-05) not used
• icr = use ICR TTs in constructing sums are constructed
• contig = number of contiguous TTs used in topological triggers
  • hard-coded in firmware
  • can be different for each trigger

Parameters in the TAB: Chips 0-9

The following is a partial list of parameters that COOR will load to the TABs Chips 0-9. It is aimed mainly at those parameters necessary for construction of trigger terms. Descriptions of "initialization" parameters, such as L2 mask thresholds and delay parameters will be added to this document in the near future.

Different parameters can be loaded to each of the 10 chips 0-9 on a TAB.

Algo	Parameter Descrip	No. of Params	Allowed Values
JET	threshold Et values (ADC counts)	7	12-bits
TAU	currently hard-coded in firmware
EM	threshold Et values (ADC counts)	7	12-bits
	emi: EM Isolation parameter	1	0-3
	EM Isolation enable/disable	1	0,1
	emf: EM/Had parameter	1	0-3
	EM/Had enable/disable	1	0,1

Parameters in the TAB: Chip 10

In Chip 10 six of the seven Chip 0-9 thresholds are chosen for output to the GAB. Currently, these are hard-coded to be the six highest thresholds in countsouth/central/north.vhd. No downloadable parameter is thus need to define this choice of thresholds.

The other trigger-term-related parameters downloaded to chip 10 are the sin and cos constants (used in calculating Et(miss) for the phi's seen by this TAB. These parameters are described in more detail here.

cos	4 12-bit encoded numbers
sin	4 12-bit encoded numbers

Parameters in the GAB

In the following, a proposal is given for the ultimate GAB trigger terms configuration. This proposal assumes fairly simple changes to the existing firmware. The current firmware state is also listed for reference.

Trigger	No. Terms Alloc.	COOR Params	Restrictions in Current F'ware
CSWJT(n,t, ALL) vhd_cjt	16	16 pairs (n,t) n = 1-4 t = 1-6	n1 - n4 = 1 n5 - n8 = 2 n9 - n12 = 3 n13 - n16 = 4
CSWJT(n,t, C) vhd_cjr	4	4 pairs (n,t) n = 1-4 t = 1-6	only 2 C terms coded (6 total w/ N & S) n1 = 1 n2 = 2
CSWTA(n,t,ratio, ALL) vhd_cta	4	4 pairs (n,t) n = 1-2 t = 1-6 ratio: in TAB params	n1 - n2 = 1 n3 - n4 = 2
CSWEM(n,t, ALL) vhd_cem	12	12 pairs (n,t) n = 1-4 t = 1-6	only 8 CEM terms in code n1 - n4 = 1 n5 - n8 = 2
CSWEM(n,t, C) vhd_cer	4	4 pairs (n,t) n = 1-4 t = 1-6	only 2 C terms coded (6 total w/ N & S) n1 = 1 n2 = 2
CSWEI(n,t,emi,emf, ALL) ---	2	2 pairs (n,t) n = 1-2 t = 1-6 emi,emf: in TAB params	not yet coded
CSWEI(n,t,emi,emf, C) ---	2	2 pairs (n,t) n = 1-2 t = 1-6 emi,emf: in TAB params	not yet coded
CSWMET(thr_adcsq, eta_sum,cut,icr) vhd_cme	4	4 values (thr_adcsq) thr_adcsq = 14-bit numbers icr: in TAB params	cut: not implemented eta_sum: hard coded to full detector
CSWTET(thr_et, eta_sum,cut,icr) vhd_cet	2	2 values (thr_et) thr_et = 14-bit number icr: in TAB params	cut: not implemented eta_sum: hard coded to full detector
CSWAJT(t_a,t_v, contig) vhd_acopjet	2	2 pairs (t_a,t_v) t_a = 1-6 t_v = 1-6	t_a = t_v
CSWBBEM(t, contig) vhd_backbackem	2	2 values (t) t = 1-6