MRI lab: FPGA controller documentation

Control registers

Register	Field	Bits	Function	device
PhaseIncrement	*	31:0	Set frequency of generated sinewave	/dev/pio_phaseIncrement
Pulse1On	*	31:0	Duration of first pulse	/dev/pio_pulse1On
Pulse1Off	*	31:0	Interval between first and second pulses	/dev/pio_pulse1Off
Pulse2On	*	31:0	Duration of second pulse	/dev/pio_pulse2On
Pulse2Off	*	31:0	Minimum interval between end of second pulse and first pulse repeat	/dev/pio_pulse2off
PulseControl	*			/dev/pio_pulseControl
	Digitizer Reset	13	0 = normal operation; 1 = reset digitizer
	ADC Test mode	12:11	00 = adc input (normal operation); 01 = adc test signal (count); 10 = test mode (DAC output); 11 = test mode (constant 0xDEADBEEF)
	ADC clock divisor	10:8	not yet implemented
	WaitDmaComplete	7	0 = do not wait; 1 = wait for fifo to empty
	IgnoreDmaReady	6	0 = normal operation; 1 = ignore
	RunContinuously	5	0 = normal operation; 1 = continuous operation
	Start	4	Start digitizer on positive edge
	Start Digitizer	3	0 = normal operation; 1 = disable ADC gate;
	DAC B output	2	0 = carrier; 1 = trigger
	Continuous Pulse Generation	1	0 = generate single pulse sequence; 1 = run continuously
	Start Pulse Generator	0	Pulse starts on positive edge.