Ⅰ. HIGHLIGHTS OF THE YEARRIKEN Accel. Prog. Rep. 53

Update of MOCO for the MPV system
H. Baba,∗1 T. Ichihara,∗1 T. Isobe,∗1 T. Ohnishi,∗1 K. Yoshida,∗1 Y. Watanabe,∗1 S. Ota,∗2 H. Shimizu,∗2S. Shimoura,∗2 S. Takeuchi,∗2 D. Nishimura,∗3,∗2,∗1 J. Zenihiro,∗4,∗1 A. O. Tokiyasu,∗5 and R. Yokoyama∗6
We have been developing a data acquisition (DAQ)
system. VME-bus-based DAQ systems are widely utilized in RIBF. To speed up the VME DAQ system,a mountable controller (MOCO)1) was developed andintroduced in some experiments2) in 2016. We could
achieve very good DAQ performance; at the same time,
problems on the usability and robustness were found.
To establish a robust and easy-to-use system, we developed a new MOCO with parallelized VME (MPV),
which is a type of parallel readout extension of VME.3)
The system architecture is described in Ref. 3). In thiscontribution, we report the update of MOCO to adopt
the MPV system.
The original MOCO and new versions (prototype andproduction) of MOCO-MPV boards are shown in Fig. 1.
In the original MOCO, trigger and data communications
are performed using the LVDS I/O and USB interface.
On the other hand, these communications between theMPV controller and MOCO-MPV are realized throughfour diﬀerential lines (LVDS I/O) that are patterned on
the MOCO-MPV board. These diﬀerential lines are
assigned as follows: 1) 100-MHz clock, 2) commandpacket, 3) data packet A, and 4) data packet B. The
100-MHz clock and the command packets are distributed
from the controller. All commutations are synchronized(a) OriginalMOCO(a) Prototype
MOCO-MPVJTAGUSB(a) Production
MOCO-MPV

DebugportJTAGLVDS
I/O PinDifferential
lines forLVDS

Fig. 1. Photograph of diﬀerent versions of MOCO. The functionalities of the prototype and production MOCO-MPVboards are the same. However, the positions of the JTAGand debug port connectors are diﬀerent.
∗1
∗2
∗3
∗4
∗5
∗6

RIKEN Nishina Center
Center for Nuclear Study, University of Tokyo
Department of Natural Sciences, Tokyo City University
Department of Physics, Kyoto University
ELPH, Tohoku University
Department of Physics and Astronomy, University of Tennessee- 13 -Interrupt
from V792

BERR
from V792

34 words block transfer
between MOCO and V792V792 Conversion �me
1 event busy ≈ 15usTrigger �ming

Fig. 2. Monitor signals between MOCO and CAEN V792
QDC captured by Tektronix MDO3034 through the debug port of the prototype MOCO-MPV board.

with this 100-MHz clock. MOCO-MPV sends 200-Mbps
data at maximum by using two data packet lines to thecontroller. This 200-Mbps data throughput is suﬃcientbecause the maximum data rate of a typical 32-bit VME
module is 160 Mbps (in experiments at RIBF, this data
rate is usually much less than 20 Mbps per VME module). An eight-port debug interface is additionally implemented on the MOCO-MPV board to monitor the bus
signals between MOCO and a VME module. Figure 2shows the signals of MOCO-MPV reading out data fromCAEN V792 QDC. MOCO-MPV waits for the interrupt
signal of V792, and the block transfer is started when
the interrupt signal is issued. After 34×32-bit data readout, the BERR signal is generated from V792, following
which this block transfer is terminated. Including theconversion time of V792, the duration of the one event
busy is only 15 µs. In the original MOCO case, DC
power is supplied via the DIN41612 female connector(right-side connector) because the board is designed toplace the front side of the VME backplane. In contrast,
since the MOCO-MPV board is installed at the rear side,both DC power and VME bus signals pass through theDIN41612 male connectors (two left-side connectors).
The MPV system with the prototype MOCO-MPV
board was successfully introduced in the NP1512RIBF79R1-02 experiment4) in November 2019 for theﬁrst time. Legacy VME DAQ systems in RIBF will begradually replaced by the MPV system together withthe production MOCO-MPV board.
References

1) H. Baba et al., RIKEN Accel. Prog. Rep. 45, 9 (2012).
2) H. Baba et al., RIKEN Accel. Prog. Rep. 50, 224 (2017).
3) H. Baba et al., RIKEN Accel. Prog. Rep. 52, 146 (2019).
4) J. Zenihiro et al., in this report.