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5. Control Block
The MAV-555 uses MPC860 as CPU. One MPC860 is
each mounted for the EM-1, TM-40, FM-68, and DM-120
boards. Two MPC860s are mounted for the PU-109 board.
On the EM-1, TM-40, FM-60, and DM-60 boards, dual
port RAM (DPM) is used for the inter-board communica-
tion.
Each board controls the following functions.
The TM-40 board is connected with DPM on the DM-120,
FM-68, and EM-1 boards so as to control DPM on each
board. During communication between boards, the control
operation is usually performed through DPM on the TM-
40 board. The TM-40 board also communicates with the
control panel. This board distributes the command from
the control panel to the DM-120, FM-68, and EM-1 boards
or transfers the information from each board to the control
panel. UDP is used as the communication protocol
between the control panel and TM-40 board. Moreover,
the TM-40 board manages a time slot or controls a refer-
ence signal.
The FM-68 board manages a file system, performs the
system management (error or warning) of the whole unit,
or memorizes a setup menu. The FM-68 board also
communicates with the PU-109 board and acquires the raid
status.
On the DM-120 board, the control signal input from the
RS-422 connector on the rear panel is input to the DM-120
board through the CN-1817 and MB-845 boards. The
input signal controls the REC/PB system and audio/video
processing system. A CPU bus is connected from the DM-
120 board to the DPR-127, APR-44, AD-160, and DA-136
boards at the corresponding port. The DM-120 board also
controls the flow of audio and video data with respect to
the PU-109 board during REC/PB operation as well as
controlling these boards.
The EM-1 board mainly communicates with the meter
panel. The communication with the meter panel is carried
out through the FP-115 and MB-845 boards using the dual
port RAM (DPM) on the FP-115 board. Moreover, the AV
monitor signal of the main unit is AV-processed, routed,
and superimposed, and output from the rear panel. An RS-
422 (VTR) signal or remote parallel signal is input from
the connector on the rear panel and sent through the MB-
845 board to the EM-1 board so as to control the editing
and effect functions and AV router.
The PU-109 board mounts each CPU for video and audio
systems and controls the raid-related block.
MAV-555
6. Meter Panel (Top panel on the Front Panel)
6. Meter Panel (Top panel on the Front Panel)
The fluorescent (FL) display tube, buttons, switches, and
rotary encoders on the meter panel are controlled by the
FP-115 board. The FP-115 board communicates with the
EM-1 board, and notifies each board of each setting
through the EM-1 board or acquires it.
For the headphone jack pin on the meter panel, the analog
audio signal from the EM-1 board is output through the
MB-845 board. The signal whose gain was changed using
the headphone volume is output through the MB-845 board
to the EM-1 board again.
7. Time Slot
The MAV-555 can simultaneously access the four ports
(maximum) of an AV signal. Therefore, a time slot system
is used for how to access the data in a raid block. Actually,
the DM-120 board (provided as a standard feature) that
inputs and outputs 1IN (R1) and 1OUT (P1) AV data and
the DM-120 board that inputs and outputs optional 1IN
(R2) and 1OUT (P2) AV data are connected using the
same buses (the bus transferred to the raid block and the
bus transferred from the raid block) as for the PU-109
board. Each port (R1, R2, P1, or P2) uses the buses for
communication or data transfer by time sharing. When the
four ports are all used for recording and playback, the time
that each port can occupy is four frames. The MAV-555
can access the raid block every 16 frames.
If a port to which any access (recording/playback) is not
gained exists, however, another port uses the empty time
slot of the port so as to increase the access speed or a raid
block uses the empty time slot for rebuilding. The use of
an empty time slot changes dynamically.
5. Control Block
7. Time Slot
5-3 (E)
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