Vfd Controller; Scart Connectors - Hitachi DV-P345E Service Manual

9. PLL - P C G U
ROCESSING LOCK ENERATION NIT
The PLL unit consists of three sub-units:
The PLLa unit generates (under ADP control) the audio interface master clock (AMCLK). It has
13 bits of frequency multiply and divide factors. Its input can be a separate clock generator or be
(externally) tied to the clock generator or crystal input to the processing clock PLL (see below).
An external control pin can indicate by-pass of this PLL unit to be used mainly for testing or for
low jitter operation.
The PLLp unit generates (under CPU control) the processing clocks. It has 8 bits of frequency
multiply and 6 bits of divide ratios. In most cases the input clock frequency will be 27 MHz
multiplied by 5 and divided by 1 to generate clk and PCLK with frequency of 135 MHz. An
external control pin can indicate by-pass of this PLL unit to be used mainly for testing. The PLL
also generates the 27 MHz video clock signal (clk27 and VCLKx2), the encoder and DACs 54
MHz processing signal (clk54), the RF channel ADC sampling clock (rf_clk) and the servo ADC
and DACs sampling clock (adc_servo_clk).
The third unit is responsible to generate the internal reset signals to all I64 units after detecting a
proper power-up condition or a proper external reset input signal.
10. F P
RONT ANEL
10.1 VFD C
ONTROLLER
The VFD controller is a PTC PT6311. This controller is not a processor, but does include
a simple state machine, which scans the VFD and reads the front panel button matrix. The 6311
also includes RAM so it can store the current state of all the VFD icons and segments. Therefore,
the 6311 needs only be accessed when the VFD status changes and when the button status is
read. The ZR36768 can control this chip directly using PIO pins or can allow the front panel PIC
to control the VFD.
11. C
ONNECTORS
11.1 SCART C
ONNECTORS
Pinout of the scart connector:
1 à Audio Right Out
2 à Audio Right In
3 à Audio Left / Monu Out
4 à Audio Gnd
5 à Blue Gnd
6 à Audio Left / Mono In
7 à Blue
8 à Control Voltage
9 à Green Gnd
10 à Comms Data 2
11 à Green
12 à Comms Data 1
13 à Red Gnd
14 à Comms Data Gnd
15 à Red
14
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