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Bits used by the heap manager:
| bits | name/purpose | suggested setting | notes
| 1-4
| LVL1_DLY
| 45
| level-1 delay, setting is different
in raw mode or with different pre/post spacing
| 5
| not used
| 0
| not used
| 6
| pre/post spacing
| 1
| if 0, 1 beam clock between pre/post samples,
if 1, 2 beam clocks
| 7-8
| Phase adjust
| 00
| level-1 phase adjust (1/4 beam clock units),
will be different if pre/post spacing or raw
mode bit is changed
| 9
| "test count mode enable"
| 0
| when this bit is set to 1,
all data packets contain data values of 1, 2, 3, ...
Setting it to zero turns this test mode off.
| 10
| IREN
| 1
| 1 means enable internal preamp resets.
| 11
| SLCT1
| 1
| along with SLCT0, this is used to decide how many bits
the ADCs use. SLCT1=1, SLCT0=0 means 10 bits.
| 12
| SLCT0
| 0
| along with SLCT1, this is used to decide how many bits
the ADCs use.
| 13
| RAW_MODE
| 0
| 0 means correlator is on, the data packets then contain
a pre-sample and a post-sample for each channel. When set
to 1, the pre- and post-samples are both returned (2 ADC values
per channel)
| 14
| CAL_EN
| 0
| Normally this bit is 0. When set to 1, the
calibration mode is enabled.
| 15
| IR1
| 0
| along with IR0, this bit controls the preamp reset
frequency. IREN turns this internal reset on/off. These bits
control the frequency.
| 16
| IR0
| 0
| along with IR1, this bit control the preamp reset
frequency.
| |
AMU/ADC bits:
| bits | name/purpose | suggested setting | notes
| 1
| MUX2_OE -- output enable
| 0
| will be set to 1 for spy channel tests, AMU spy
| 2-6
| MUX2_0-4 -- address bits
| 00000
| will be set to various values in spy channel tests,
bit 2 is LSB, AMU spy
| 7
| CORR_SEL -- correlator select
| 1
| this bit is set to the opposite of RAW_MODE
| 8-13
| DAC_VREF
| 2.97
| max voltage in digitization "ramp"
| 14-19
| VCORR
| 1.28
| --
| 20-25
| IREF_DAC
| 8.48
| sets slope of ramp
| 26
| MUX2-HIZ -- pull down
| 0
| will be changed for spy channel tests, AMU spy
| 27
| MUX1-HIZ -- pull down
| 0
| will be changed for spy channel tests, preamp spy
| 28
| MUX1-OE -- Output enable
| 0
| will be changed for spy channel tests, preamp spy
| 29-33
| MUX1_0-4 -- address
| 00000
| will be changed for spy channel tests,
bit 29 is LSB, preamp spy
| |
TGV's:
| bits | name/purpose | suggested value | notes
| 1-32
| CS_DIS[1..32] Output current sum disable
| 0
| by default, leave all channels on
| 33-96
| DIS_TWK[32..1] a and b disc. tweak
| 0
| channel-channel adjustment in disc levels
| 97-128
| PRE_DIS[1..32] preamp disable
| 0
| by default, leave all channels on
| 129-160
| CAL_DIS[32..1] calibration disable
| 1
| 1 means calibration pulse is enabled
| 161-166
| THRESH_DAC -- disc. thresh. dac
| 0.502
| this means the threshold is moderately high, 0
corresponds to highest discriminator threshold,
noise is usually around 1.4V.
| 167-172
| VMID_DAC
| 3.171
| offset for Voltage output
| 173-178
| VGATE_DAC
| 1.989
| discriminator Vgate, sets sensitivity of Vthresh
| 179-184
| VFB_DAC, feedback resistor
| 3.03
| this is the only DAC with a test-point on the MCM
| 190-185
| VCAL_DAC
| 3.48
| means the max injected pulse (5.00 is minimum)
| |