TDC-GPX acam messelectronic gmbh, TDC-GPX Datasheet - Page 50

• Manufacturer Part Number: TDC-GPX
• Description: Precision Time Interval Measurement
• Manufacturer: acam messelectronic gmbh

5.11 Measurement Flow
In the following we shows a typical example of register settings and measurement flow in M-Mode.
Task: Typical application laserscanner.
Given a Start signal with 10 kHz rate. To each Start there is one Stop event on channel 1. The time between Stop
and Start shall be measured with high resolution, using the LVPECL inputs.
Choice: M-Mode, triggering the external laser,
//****** M-Mode, Stop against Start **********
PuResN=Low;
PuResN=High;
StopDis1
StopDis2
StopDis3
StopDis4
_oupd( 0,0x000008B);
_oupd( 1,0x0620620);
_oupd( 2,0x0062004);
_oupd( 3,0x000001E);
_oupd( 4,0x6000300);
_oupd( 5,0x0000000);
_oupd( 6,0x8000000);
_oupd( 7,0x0001FB4);
_oupd(11,0x7FF0000);
_oupd(12,0x2000000);
_oupd(14,0x0000000);
_oupd( 4,0x2400001);
StopDis1
StopDis2
StopDis3
StopDis4
do
{
} while(!quit)
TriggerLaser;
while(!(_inpw(8) & 0x0020));
_outpd(4,0x7000300);
while((_inpd(8) & 0x0800)>0);
FIFO0 = _inpd(8) & 0x7FFFFF;
printf("%5.3fns\n",float(FIFO1)*27.4348/1000/31);
_outpd(4,0x6400300);
acam-messelectronic gmbh - Am Hasenbiel 27 - D-76297 Stutensee-Blankenloch - Germany - www.acam.de
= High;
= High;
= High;
= High;
= Low;
= Low;
= Low;
= Low;
// Power-up reset
// Disable inputs
// write configuration registers:
// Rising edges, Start ringoscil.
// Channel adjust = 6 & 2
// R-Mode, channel adjust = 6 & 2
// Use LVPECL inputs, MSet = 30
// EFlagHiZN, Quiet Mode, M-Mode
// -
// Switch on ECL power
// Bin = 0.8850ps (resolution ~ 10ps rms)
// Any error -> ErrFlag
// MTimer to IrFlag
// Master reset
// Enable inputs
// send trigger to the laser
// Check Interrupt flag
// Reg4, ALU trigger
// Check Empty flag
// Master reset
50
// Read FIFO0
// Display time in ns
TDC-GPX