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Theory of Operation
3–12
SPG 422 Service Manual (B034000 and above)
Color
Lock
Sync
Lock
Black
Clock
Buffer
To
Digital
Board
Figure 3–3: Block diagram of burst and sync locks <2>
Audio Generator
. The Audio Generator consists of U24 (the controller PLD), U22
(Channel 1 and 2 RAM), and U23 (Channel 3 and 4 RAM).
The controller contains an address counter that free-runs on a clock locked to the
serial test signal output clock, at the audio data output bit-rate (6.144 MHz). It
continuously reads out the audio data. It also has another counter that can be
single-stepped by the microprocessor for downloading audio data. The micropro-
cessor gets audio frequency and amplitude and status bits from the user or the
NVRAM, generates the audio data stream, inserts the CRC, and downloads it
into RAM.
The controller has five primary functions.
1. Generate the RAM address needed by the microprocessor to write and read
from the audio RAMs (U22 and U23).
Serial Audio Outputs <3>
Summary of Contents for SPG 422
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