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6.6 LTC/VITC READER CIRCUIT DESCRIPTION
TECHNICAL DESCRIPTION
The submodule used for the VITC generator is identical to the 632 Character
generator submodule. Jumper JP3 at the front of the sub-module selects the
VITC mode when it is in the HI position and the Character mode when it is in
the LO position. See section 6.8 for the circuit description that applies to
both the VITC and Character generator uses of this board.
The 611 reader is a microcontroller based module functionally divided into
the following hardware subsystems:
1.
2.
3.
4.
The microcontroller, LTC reader, and video processing circuits are
contained on the main circuit card (6110). The VITC reader circuitry is
optional and is contained on a separate sub-module (6111) which plugs
into the main module. Input buffers and all input/output connectors are
contained on a separate I/O module, (7006) to which the 611 module plugs
in.
The relevant schematic drawings are shown in brackets for each
section of the circuit.
6.6.1 Microcontroller (6110-30)
At the heart of the 611 reader module is a DS80C320 microcontroller,
(MCU) U24.
peripheral interfacing to the rest of the circuits.
contained on EPROM U23. The EPROM is divided into two halves, with
the upper addressing for the PAL video standard, and the lower addressing
Model 4025TR Film Footage Encoder Manual
VIDEO IN
EV-COM
Inter-module
serial comm.
VITC READER (opt.)
Figure 6-11: 611 Module Block Diagram
Microcontroller & I/O
High speed LTC Reader
Sync Separator/Video processing
High speed VITC Reader
Its three 8 bit bi-directional ports and 8 bit bus provide
I/O opt.
LTC IN
LTC READER
Program memory is
Page 6-17
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