Sony BVH-2000, Operation And Maintenance Manual

Page: 318 / 505

5-6-8. Interface
The data communication between the system control and servo
is
11~r1"""''''<:llr"",n
SYSTEM CONTROL /SERVO INTERFACE
sv-
43 CPU
~ ---L ~ __ '-
TENS ION DETECTORS
~VIDEO HEADS
I
1----1--"'-« :>---:---....-. CAPSTAN MOTOR
1. Control Panel/SY-79 Interface
The below based on an when the
PLAY switch on the control panel has been pressed.
from of
arrayed at bit-I of address FEOOH (refer to key matrix list in
Section 5-6-5), and
PLAY is
read at high and read into the CPU on the SY-79 board
2. SY-79/Common Memory Interface
The PLAY data, which has now been read, is transmitted to the
common memory as the "12H" data (see produced by
the NORMAL PLAY command on the SY-79 board
CPU, and it is read into address AOOOH of the main
area. The transport
PLAY data is read into the AOOOHaddress of the common
AOOlH
memory form the transport control area (3 bytes). The transport
control data is read into address AOOOH,which is the 1st byte,
and the data are into addresses AOOIH A002H,
which are the 2nd and 3rd bytes.
BVH-2000(U!C)/PS/PM
BVH-2180(U/C)/PS/PM
~~----.DRUM MOTOR
For instance, when the VTR is played back in the PLAY mode,
"12H" denoting NO RMAL PLAY is read into the 1st byte AOOOH
is normal
(addresses AOOIH!A002H) is not used. Furthermore, when the
forward transport is read into the 1st byte address AOOOHand
the data in the SHUTTLE mode is read into the DATA-l
AOOIH address. Furthermore, the data for the
interim speed of the speed data, which has been read into
The tape speedof the command to which DATA-l is added is
SPEED=10
(N/32 -2)
+M/256 {10
(N+l/32 -2)
-10
(N/32 -2)}
M:SPEED DATA OF A002H
The tape speed a ±25.5% range in 0.1% steps with
respect to l x normal speed is read into DATA-2 (AOOIH).
is "OlH" at 0.1% 25.5%. The "+"
are determind by the transport direction of the command
5-6-13
SYSTEM CONTROL SYSTEM