JLab F250ADC - Revision history

Foretony: /* Set timing window */

2011-07-29T21:14:12Z

Set timing window

2011-07-29T21:13:06Z

Set the FADC processing mode

2011-05-18T20:01:30Z

Test pulse Measurment

2011-05-18T19:58:37Z

faChanDisable

2011-05-17T23:06:08Z

more DMA error

2011-05-17T21:33:54Z

DMA transfer error

2011-05-17T15:34:49Z

Errors

2011-05-06T19:43:02Z

Set timing window

2011-05-06T19:41:19Z

Set timing window

2011-05-06T19:37:48Z

Configure ADC for NaI readout

← Older revision		Revision as of 21:14, 29 July 2011
Line 1,567:		Line 1,567:


−	PL = 40 = ~~400~~ ns = programmable latency ; time delay to record measurements after trigger is received and time window begins	+	PL = 40 = 160 ns = programmable latency ; time delay to record measurements after trigger is received and time window begins

	PTW= 20 => 80 nsecPulse Time width = time interval window for measurements		PTW= 20 => 80 nsecPulse Time width = time interval window for measurements

← Older revision		Revision as of 21:13, 29 July 2011
Line 910:		Line 910:


−	PL = 40 = ~~400~~ ns = programmable latency ; time delay to record measurements after trigger is received and time window begins	+	PL = 40 = 160 ns = programmable latency ; time delay to record measurements after trigger is received and time window begins

	PTW= 20 => 80 nsecPulse Time width = time interval window for measurements		PTW= 20 => 80 nsecPulse Time width = time interval window for measurements

@@ Line 996: / Line 996: @@
 = Test pulse Measurment=
-[[File:FADCTestPulse_05182011.png]]
+[[File:FADCTestPulse_05182011.png|200 px]]
 = faChanDisable=

@@ Line 993: / Line 993: @@
 value = 44 = 0x2c = ','
 </pre>
 = faChanDisable=
@@ Line 1,007: / Line 1,012: @@
 faChanDidable(0,0xfffe)
 =Documentation=

← Older revision		Revision as of 23:06, 17 May 2011
Line 1,496:		Line 1,496:

	about every 1000 +/- 500 events.		about every 1000 +/- 500 events.
		+
		+	See runs 2141 and 2142
		+
		+	Now I increase the latency to 200 (800 ns).
		+
		+	Long run 2143 was taken.

	==Extra words==		==Extra words==

← Older revision		Revision as of 21:33, 17 May 2011
Line 1,472:		Line 1,472:

	clearing the module and downloading everything again seemed to make the problem go away. Also power cycling the VME crate as well.		clearing the module and downloading everything again seemed to make the problem go away. Also power cycling the VME crate as well.
		+
		+
		+	:It also seems to help if you do software triggers.
		+
		+	==more DMA error==
		+
		+	I am having trouble getting some configurations working without a DMA error.
		+
		+	for example
		+
		+	:The smallest process configuration always has a DMA error
		+
		+	faSetProcMode(7,1,2,1,0,0,0,0)
		+
		+
		+	The smallest one I was able to get working without a DMA error was
		+
		+	faSetProcMode(7,1,20,8,0,0,0,0)
		+
		+	I do see the error
		+
		+	interrupt: ERROR: Data still in FADC (event 1039, scan 0x1 csr 0xf06318ef ) - clearing
		+
		+	about every 1000 +/- 500 events.

	==Extra words==		==Extra words==

← Older revision		Revision as of 15:34, 17 May 2011
Line 1,472:		Line 1,472:

	clearing the module and downloading everything again seemed to make the problem go away. Also power cycling the VME crate as well.		clearing the module and downloading everything again seemed to make the problem go away. Also power cycling the VME crate as well.
		+
		+	==Extra words==
		+
		+	Extra data words are appearing in the FADC bank written to the CODA data file.

	=Configure ADC for NaI readout=		=Configure ADC for NaI readout=

← Older revision		Revision as of 19:37, 6 May 2011
Line 1,489:		Line 1,489:

	Since the clock is 250 MHz, this means each time bin is 4 ns. A timing window with 500, 4 ns bins will sum to 2 microseconds.		Since the clock is 250 MHz, this means each time bin is 4 ns. A timing window with 500, 4 ns bins will sum to 2 microseconds.
		+	== Set timing window==
		+
		+	<pre>
		+	int
		+	faSetProcMode(int id, int pmode, unsigned int PL, unsigned int PTW,
		+	unsigned int NSB, unsigned int NSA, unsigned int NP, int bank)
		+
		+
		+	id = slot number =7
		+
		+	An example of this should be in one of the Readout lists, however, right now there are 3 viable processing modes (pmode =1,2 or 3)
		+
		+	pmode = 1 RAW Window mode: all samples within PTW are saved
		+	pmode = 2 RAW Pulse mode: NSA+NSB+1 samples around a threshold crossing
		+	are saved.
		+	pmode = 3 Integral pulse mode: NSA+NSB+1 samples are summed and the sum
		+	along with the timestmp for the threshold crossing are saved.
		+
		+
		+	PL = 40 = 400 ns = programmable latency ; time delay to record measurements after trigger is received and time window begins
		+
		+	PTW= 20 => 80 nsecPulse Time width = time interval window for measurements
		+	= number of samples in the pulse time window moving forward in time from the location of the latency.
		+
		+
		+
		+	NSB = 3 = Number of Samples before before the pulse to record
		+
		+	NSA=6 = number of samples after the pulse to record
		+
		+	NP =1 = number of pulses to look for in the PTW
		+
		+	</pre>
		+



	[[VME_modules]]		[[VME_modules]]