Optional Modules Theory Of Operation; Figure 2: Simplified Block Diagram Of The Option Ag - Tektronix SPG8000A Service Manual

Theory of operation

Optional modules theory of operation

Option AG
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The Power Combiner board also has the fan controllers, so the speed of all three
fans can be set and sensed by the instrument processor over the I2C interface.
The network interface signals pass through the combiner but only connect to
the two connectors.
An I2C interface is used to allow the processor to access the micro-controller
on the power combiner, the fan speed control, and the EEPROMS in the power
supply modules.
The instrument has a standard Genlock/Black generator board, plus orderable
option boards. The options are: GPS Receiver board, AG board, BG board, and
SDI board. This section describes the functions associated with those boards.
This section describes the basic operation of the major circuit blocks in the
Option AG Audio Generator.
Bus interface. This block provides the communication between the Option AG
circuitry and the instrument Main board.
Audio memory. This block contains 20/24 bits audio data for all of the serial
audio outputs.
Audio data controller. The block is a part of the FPGA. It receives audio data
from the Audio Memory and encodes these data to serial audio data stream that
comply with the AES/EBU standard.
Channel buffers (1+2, 3+4, 5+6, 7+8, and silence). These blocks receive the digital
audio data from the FPGA and set the output amplitude to the specified level.
Figure 2: Simplified block diagram of the Option AG
SPG8000A Master Sync / Clock Reference Generator Service Manual