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kHz-SLR PC Board

kHz-SLR PC Board. Complete PC Board. for kHz SLR. Eastbourne , October 200 5. Motivation. Present kHz Setup at Graz: Runs nearly perfect, very stable, reliable (DOS  ...) It is simple to operate; Lot of space for additional software routines; etc. etc. BUT:

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kHz-SLR PC Board

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  1. kHz-SLR PC Board • Complete PC Board • for kHz SLR Eastbourne, October 2005

  2. Motivation • Present kHz Setup at Graz: • Runs nearly perfect, very stable, reliable (DOS  ...) • It is simple to operate; • Lot of space for additional software routines; etc. etc. BUT: • Not easy to add new hardware, controls, cables ... • Needs „drilling holes“ to add simple new features ... • Limits on available I/O lines on present FPGA chip; • „Provisional“ or „Grown“ hardware: Eliminate it ... • => Decision made to design a new kHz Control Board Eastbourne, October 2005

  3. Design Goals • This kHz SLR PC Board should • Handle / control all common tasks in kHz SLR; • Be flexible, easily adaptable for future tasks; • Be easy to program, with any language; • In other words: It should be a Simple, Modular, Inexpensive Laser Equipment ==> „SMILE“ (And due to kHz ==> it‘s a „kilo-SMILE“  ) Eastbourne, October 2005

  4. Design • Design of the kHz PC Board: • Simple ISA Board, fits in any PC with ISA slots; • Industry boards with 3-GHz PC cards available; • The board contains mainly • a big FPGA (Field Programmable Gate Array), • Interface to the PC; plus some glue electronics; • About 150 I/O lines available; • With additional, cheap A/D converter card, the complete Graz kHz SLR station can be operated; • ISA cards are plugged into standard passive backplane Eastbourne, October 2005

  5. Features implemented (1) • 1 pps and 10 MHz applied; • Generates internal time scale, 1 µs resolution; • Internal Time Synchronized to UTC / GPS; • Allows access to actual time within few µs ... • Complete Range Gate Generator • 0.5 ns Resolution, < 1 ns accuracy; • Internal FIFO registers for up to 300 next gates (GPS); • Just program next RG event time, and forget it  Eastbourne, October 2005

  6. Features implemented (2) • Complete kHz Laser Control: • Generation of Laser firing triggers (10 Hz – 2 kHz); • Control of Pump Diodes for the kHz Laser (CW) • Control and/or Dephasing of Amplifier Pump Diodes: Allows simple attenuation for Calibration etc. • Handles safety inputs from Aircraft Detection etc. • Handles communication with Event Timer(s): • Graz E.T.; Riga E.T.; future ETs ? • Asynchronous Read-Out of Event Timers; Eastbourne, October 2005

  7. Features implemented (3) • Automatic Receive/Transmit Overlap Avoidance • Automatically detects such situations; • Shifts next Laser Firing pulses accordingly; • No external checks / no intervention necessary; • Saves considerable CPU time of Real Time PC ... • Serial 64-Bit Interfaces (I/O); several units: • Single BNC cables to Mount, Laser, Observers ... • 64-bit words transmitted / received serially; • Each bit controls mirrors, switches, FOV, DIV, etc.... • Very flexible / upgradable, just add a line in programs Eastbourne, October 2005

  8. Status of kHz SLR board • First prototype is operational: • All functions / subroutines tested, verified; • Plugged into passive backplane; • Together with a standard 3.2 GHz CPU board; • Main kHz programs will be adapted within next weeks; Eastbourne, October 2005

  9. Image of Graz kHz SLR Board

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