Difference between revisions of "Sync Box DC-in io"

From MCEWiki
(→‎'''Interface Connector''')
(→‎'''Interface Connector''')
Line 10: Line 10:
 
== '''Interface Connector''' ==
 
== '''Interface Connector''' ==
 
: A DB25 connector that provides the following auxiliary input/outputs:
 
: A DB25 connector that provides the following auxiliary input/outputs:
−
; Data Valid
+
; DATA_VALID
 
: TTL input. Detects falling edges from a Real-Time Sequencer (implemented by SCUBA2) which tells the Sync box when to tell the MCE's to collect data.
 
: TTL input. Detects falling edges from a Real-Time Sequencer (implemented by SCUBA2) which tells the Sync box when to tell the MCE's to collect data.
 
;OPTO-TTL
 
;OPTO-TTL
Line 22: Line 22:
 
; DATA_SYNC4
 
; DATA_SYNC4
 
:TTL output. asserted for 1us on an Address-Return-to-Zero(ARZ) if a DV pulse is detected since the last ARZ.
 
:TTL output. asserted for 1us on an Address-Return-to-Zero(ARZ) if a DV pulse is detected since the last ARZ.
 +
 +
=== DB25 poinout ===
 +
{|
 +
|-
 +
! Pin !! Signal !! Pin !! Signal
 +
|-
 +
|  '''1''' || Data_Valid+    || '''14''' || GND
 +
|-
 +
|  '''2''' || Data_Valid-    || '''15''' || Data_Sync1+
 +
|-
 +
|  '''3''' || GND            || '''16''' || Data_Sync1-
 +
|-
 +
|  '''4''' || Data_Sync2+    || '''17''' || GND
 +
|-
 +
|  '''5''' || Data_Sync2-    || '''18''' || Data_Sync3+
 +
|-
 +
|  '''6''' || GND            || '''19''' || Data_Sync3-
 +
|-
 +
|  '''7''' || Data_Sync3_TTL || '''20''' || GND
 +
|-
 +
|  '''8''' || GND            || '''21''' || Data_Sync4+
 +
|-
 +
|  '''9''' || Data_Sync4_TTL || '''22''' || Data_Sync4-
 +
|-
 +
| '''10''' || ''N/C''        || '''23''' || GND
 +
|-
 +
| '''11''' || ''N/C''        || '''24''' || ''N/C''
 +
|-
 +
| '''12''' || ''N/C''        || '''25''' || ''N/C''
 +
|-
 +
| '''13''' || ''N/C''
 +
|}
  
 
= =
 
= =

Revision as of 15:58, 7 October 2010

MCE0 to MCE7
8 Fibre outputs. Carries a 50 MHz Manchester-encoded signal containing data packets, which include incremented sequence numbers. Programmable as two sets of 4 outputs with differently spaced data packets on each.
RS232 Command IO
DB9 connector, TTL input and output, used to command the Sync Box from a PC using a regular RS232 cable.
TTL-IN
BNC connector, TTL input, spare input to the FPGA. ***Not currently used, and open for suggestions.
TTL-OUT
BNC connector, TTL output. Carries a 50 MHz clock signal.

Interface Connector

A DB25 connector that provides the following auxiliary input/outputs:
DATA_VALID
TTL input. Detects falling edges from a Real-Time Sequencer (implemented by SCUBA2) which tells the Sync box when to tell the MCE's to collect data.
OPTO-TTL
TTL input, spare input to the command processor. ***Not currently used, and open for suggestions.
DATA_SYNC1 (formerly DV_SPARE1)
TTL output. Carries a 5 MHz clock signal that is synchronous with DATA_SYNC2. (WARNING: signal polarity may be swapped)
DATA_SYNC2 (formerly DV_SPARE2)
TTL output. Carries a 5 MHz data signal that is synchronized with DATA_SYNC1, and contains the same frame sequence numbers as the MCE(0-7) outputs. NOTE: This output only contains the DV info stream (40-bit), but not the occurrences of Addr_Return-to-Zero between DVs. (WARNING: signal polarity may be swapped)
DATA_SYNC3
TTL output. asserted for 1us on an Address-Return-to-Zero(ARZ) if a DV pulse is detected since the last ARZ.
DATA_SYNC4
TTL output. asserted for 1us on an Address-Return-to-Zero(ARZ) if a DV pulse is detected since the last ARZ.

DB25 poinout

Pin Signal Pin Signal
1 Data_Valid+ 14 GND
2 Data_Valid- 15 Data_Sync1+
3 GND 16 Data_Sync1-
4 Data_Sync2+ 17 GND
5 Data_Sync2- 18 Data_Sync3+
6 GND 19 Data_Sync3-
7 Data_Sync3_TTL 20 GND
8 GND 21 Data_Sync4+
9 Data_Sync4_TTL 22 Data_Sync4-
10 N/C 23 GND
11 N/C 24 N/C
12 N/C 25 N/C
13 N/C

Connector Pinout

Block Diagram

back to Sync Box

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