Data Acquisition Settings Register - Read/Write; User Led Source Selectors - Read /Write - Wiener VM-USB User Manual

3.4.3 Data Acquisition Settings Register – Read/Write
Offset = 8 / 0x8
The Data Acquisition Settings register stores the desired readout trigger delay and the scaler
readout mode and frequency. The readout trigger delay represents time in microseconds that
is allowed to lapse, counting from the start signal applied to the NIM I1 input or IRQ
received, before the stack execution is started, and is stored in bits 0-7 of the register. The
scaler readout frequency defines the frequency at which scaler stack is to be executed during
the data acquisition. The stored value is equal to the number of data events separating the
scaler readout events. When the value is zero, scaler readout is suppressed. The number is
stored in bits 16-31 of the register.. The event-based and timer-based triggers are set to
cooperate on "whichever-comes-first" policy.
The composition of the Data Acquisition Settings Register is as follows shown in the table
below
Scaler Readout Frequency
3.4.4 User LED Source Selectors – Read /Write
Offset = 0x10 / 0xC
The Data stored in this register identifies the sources of the four user LED's. The actual
selection of sources is firmware specific and subject to customization. The general bit
composition of the selector word is shown in the table below
LED
Top Yellow
Red
Green
Bottom Yellow
The 3-bit code identifies the (one-of-eight) source of the signal. The four first sources may
differ for different LED's, but the last four are shared among all four LED's. The source
Codes are as follows:
Code Top Yellow
0 USB OutFIFO Not
Empty
1 USB InFIFO Not
Empty
2 Scaler Event
USB InFIFO Full
3
VME DTACK
4
VME BERR
5
6 VME Bus Request
7 VME Bus Granted
WIENER, Plein & Baus GmbH
16-31
Unused Bits
5-7
13-15
21-23
29-32
Event Trigg.
NIM I1
NIM I2
Busy
VME DTACK
VME BERR
VME Bus Request
VME Bus Granted
8-15
Scaler Readout Period
Latch Bit Invert Bit
4
12
20
28
Red Green
Acquire
Stack Not Empty
Event Ready
Event Trigger
VME DTACK
VME BERR
VME Bus Request
VME Bus Granted
18
0-7
Readout Trigger Delay
Code Bits
3 0-2
11 8-10
19 16-18
27 24-26
Bottom Yellow
Not Slot One
USB Trigger
USB Reset
VME BERR
VME DTACK
VME BERR
VME Bus Request
VME Bus Granted
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