Seite

Version 0.03 2002.11.04 dg/kip

DCS to Read Out Board

A DIMM144 connector / horizontal / SMD is provided for connection.

               2x2x8 bidirectional chains for DCS link rings / LVDS
               3x8 control lines for voltage regulators
               max. 8 clock distribution lines / differential ?
               (1? reset line / to be defined)


               min. 24 x GND (digital )
               4 GND connection control lines for grounding quality monitoring
               6 pins for main supply ( 4 Volts ) for DCS board

             DIMM 144 connector datasheets : Fujitsu ; JAE ; DDK socket / footprint / module
               Orcad DIMM144 horizontal SMD part definition (dg)

Page 1 back to content

System Overview

   In figure 4 only one data chain is shown. At least 8 data chains have to be served by one DCS
   board. Each chain consists of to antiparallel lines which in turn consist of a differential cable pair.
   So at least 16 inputs and 16 outputs are required. The two antiparallel data chains are for
   redundancy. If the chain is broken at one point all clients can still be served by the DCS board
   because all clients are accessible by two sides.

For more details see TRD document

Page 2 back to content

DIMM 144 connector pinout ( preliminary )

1	GND	2	GND
3	DCS downlink 1n (LVDS)	4	DCS downlink 1p (LVDS)
5	GND	6	GND
7	DCS downlink 2n (LVDS)	8	DCS downlink 2p (LVDS)
9	GND	10	GND
11	DCS downlink 3n (LVDS)	12	DCS downlink 3p (LVDS)
13	GND	14	GND
15	DCS downlink 4n (LVDS)	16	DCS downlink 4p (LVDS)
17	GND	18	GND
19	DCS downlink 5n (LVDS)	20	DCS downlink 5p (LVDS)
21	GND	22	GND
23	DCS downlink 6n (LVDS)	24	DCS downlink 6p (LVDS)
25	GND	26	GND
27	DCS downlink 7n (LVDS)	28	DCS downlink 7p (LVDS)
29	GND	30	GND
31	DCS downlink 8n (LVDS)	32	DCS downlink 8p (LVDS)
33	GND	34	GND
35	Clock 1p	36	Clock 2n
37	Clock 1n	38	Clock 2p
39	GND	40	GND
41	GND	42	GND
43	Clock 3p	44	Clock 4p
45	Clock 3n	46	Clock 4n
47	GND	48	GND
49	Vreg Shutdown 1	50	Vreg Shutdown 2
51	Vreg Shutdown 3	52	Vreg Shutdown 4
53	Vreg Shutdown 5	54	Vreg Shutdown 6
55	Vreg Shutdown 7	56	Vreg Shutdown 8
57	Vreg Shutdown 9	58	Vreg Shutdown 10
59	Vreg Shutdown 11	60	Vreg Shutdown 12

Page 3 back to content

	3,3 Voltage Key Center		3,3 Voltage Key Center
61	Vreg Shutdown 13	62	Vreg Shutdown 14
63	Vreg Shutdown 15	64	Vreg Shutdown 16
65	Vreg Shutdown 17	66	Vreg Shutdown 18
67	Vreg Shutdown 19	68	Vreg Shutdown 20
69	Vreg Shutdown 21	70	Vreg Shutdown 22
71	Vreg Shutdown 23	72	Vreg Shutdown 24
73	GND	128	GND
75	+3,8V DCS Supply	130	+3,8V DCS Supply
77	+3,8V DCS Supply	132	+3,8V DCS Supply
79	+3,8V DCS Supply	134	+3,8V DCS Supply
81	GND	136	GND
83	GND	84	GND
85	GND	86	GND
87	reserved	88	reserved
89	reserved	90	reserved (RESET#)
91	GND	92	GND
93	GND sense 1	94	GND sense 2
95	GND sense 3	96	GND sense 4
97	GND	98	GND
99		100
101		102
103		104
105		106
107		108
109	GND	100	GND
111	GND	112	GND
113	DCS uplink 8n (LVDS)	114	DCS uplink 8p (LVDS)
115	GND	116	GND
117	DCS uplink 7n (LVDS)	118	DCS uplink 7p (LVDS)
119	GND	120	GND

Page 4 back to content

121	DCS uplink 6n (LVDS)	122	DCS uplink 6p (LVDS)
123	GND	124	GND
125	DCS uplink 5n (LVDS)	126	DCS uplink 5p (LVDS)
127	GND	128	GND
129	DCS uplink 4n (LVDS)	130	DCS uplink 4p (LVDS)
131	GND	132	GND
133	DCS uplink 3n (LVDS)	134	DCS uplink 3p (LVDS)
135	GND	136	GND
137	DCS uplink 2n (LVDS)	138	DCS uplink 2p (LVDS)
139	GND	140	GND
141	DCS uplink 1n (LVDS)	142	DCS uplink 1p (LVDS)
143	GND	144	GND

      There are 24 shutdown lines on the DIMM connector for the voltage regulars / modules.
      These Vreg control lines switch of power on modules ( groups ) which behave strange.
      This should prevent modules/groups from drawing excessive power and heating up the chamber.
      Module failure is especially expected because of radiation effects by high energy particles.

      Additionally maximum 8 clock lines have to be distributed by the DCS board. These clock lines
      require outstanding low jitter because of synchronisation demands.

Page 5 back to content