Table of Contents
Advertisement
5. Control Block
The MAV-555A uses MPC860 as CPU. One MPC860 is
each mounted for the EM-3, PU-121, and DM-127 boards.
Two MPC860s are mounted for the FM-81 board. On the
EM-3, FM-81, and DM-127 boards, dual port RAM
(DPM) is used for the inter-board communication.
Each board controls the following functions.
In the FM-81 board (TM block), the CPU is connected
with DPMs on the DM-127 board, FM-81 board (FM
block), and EM-3 board to control DPMs on each board.
During communication between boards, the control
operation is usually performed through DPM on the FM-81
board (TM block). The FM-81 board (TM block) also
communicates with the control panel. This board distrib-
utes the command from the control panel to the DM-127
board, FM-81 board (FM block), and EM-3 board or
transfers the information from each board to the control
panel. UDP is used as the communication protocol
between the control panel and FM-81 board (TM block).
Moreover, the FM-81 board (TM block) manages a time
slot or controls a reference signal.
The FM-81 board (FM block) manages a file system,
performs the system management (error or warning) of the
whole unit, or memorizes a setup menu. The FM-81 board
(FM block) also communicates with the PU-121 board and
acquires the raid status.
On the DM-127 board, the control signal input from the
RS-422 connector on the rear panel is input to the DM-127
board through the CN-2178 and MB-944 boards. The
input signal controls the REC/PB system and audio/video
processing system. A CPU bus is connected from the DM-
127 board to the DPR-189 and ADA-61 boards at the
corresponding port. The DM-127 board also controls the
flow of audio and video data with respect to the PU-121
board during REC/PB operation as well as controlling
these boards.
The EM-3 board mainly communicates with the meter
panel. The communication with the meter panel is carried
out through the MB-944 and FP-128 boards using the dual
port RAM (DPM) on the FP-128 board. An RS-422
(VTR) signal or remote parallel signal is input from the
connector on the rear panel and sent through the CN-2178
and MB-944 boards to the EM-3 board so as to control the
editing and effect functions and AV router.
The PU-121 board controls the raid-related block.
MAV-555A
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-128 board. The FP-128 board communicates with the
EM-3 board, and notifies each board of each setting
through the EM-3 board or acquires it.
For the headphone jack pin on the meter panel, the analog
audio signal from the EM-3 board is output through the
MB-944 and FP-128 boards.
7. Time Slot
The MAV-555A 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. When
the four ports are all used for recording and playback, the
time that each port can occupy is four frames. The MAV-
555A 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.
5-1. MAV-555A
5-3 (E)
Advertisement
Table of Contents
