Sony BVH-2000, Operation And Maintenance Manual

Page: 316 / 505

1. Outline
The common memory ( the SY-80 board
switches the address bus and data bus so that it is accessed from
the two CPU s on the SY-79 and SY-80 boards and it exercises
CPUs simultaneously.
• When it is accessed virtually simultaneously, it supplies a
to in accessing
until has its access.
• There is no order of priority between the two CPUs.
• Access
CPU cannot be cancelled actual
The status data indicating the operating status of the VTR and
after the power has been switched on or during normal
operation are written into the common memory. and its
contents be checked test function (see 4-
13).
Addresses AOOOHthrough A2FFH in the common memory are
and the 256 bytes from addresses A300H to A3 FFH are used as
64 counters of 4 bytes each.
AOOOH-A07FH: MAIN SY-80)
2. A08OH-AOFFH: MAIN COMMUNICATION (SY-80to SY-79)
3. AIOOH-A17FH: SUPERIMPOSE (SY-79 to SY-80)
5. A20OH-A27FH: HARD PORT MONITOR (SY-79 to SY-80)
6. A28OH-A2FFH: HARD PORT MONITOR (SY-80 to SY-79)
BVH-2000(U/C)/PS/PM
BVH-2180(U/C)/PS/PM
The main area is assigned as shown below.
MEl\IIORY MAP
CONTROL Commands
A008
TIMER CONTROL · .. TC GEN. Control
AOIO
SELF STATUS
· .. Local Machine (self)
Control Data
Commands
EOT STATUS etc · .. EOT Status Data, etc.
PLA YER STATUS Status Data
· .. Player Timer Display Data
z
0
i=
«
· .. SY-79/80 Read/Write Test
cr::
w
o,
SY-80 STATUS . SY-80 Status Data
0
TIMER DISPLA Y Data
BLOCK 2 DISPLA Y · .. Block 2 Fluorescent
Data
· .. SY-80/79 Read/Write Test
When the ALL DISPLAY switch 813-3 on the TC-14A board is
the monitor screen are read into the common memory in ASCII
code in the order in which they are displayed.
SY-79 board CPU writes the data, are read
the board and are transferred the
board.
AIOO ...----------...,
Al80
1----------4
AIFF---------...J
5-6-11
SYSTEM CONTROL SYSTEM