Theory of Operation
2-2
MTX100A MPEG Recorder & Player Service Manual
PCR/DTS Updater.
This block consists of a PCR counter and update logic. The
PCR counter is a complex counter, which consists of a 300-notation counter and
33-bit counter. The counter counts the 27 MHz standard frequency. The update
logic replaces the PCR and PTS/DTS values in a transport stream with the sum
of the original value and the PCR counter value.
Receive Rate Counter.
This 24-bit counter is used for receive-rate calculation on
recording process. When used a data valid signal (DVALID), the counter counts
byte data rate. When not used DVALID, the counter counts receive clock.
Transmit Byte Counter.
This 32-bit counter counts transmitted bytes. This counter
can be read by the control software.
Receive Rate Counter.
This circuit detects receive rate. Its status is updated every
50 ms.
The interrupt controller sends the following interruption signals to the CPU: Play
FIFO empty, Record FIFO full, external trigger, 10 Hz, Playout DMA transfer
finished, and Record DMA transfer finished. These interruptions can be disabled
by the MTX100A application software. At power on, all interruptions are
disabled.
The TS clock generator consists of a VCO (Voltage Control Oscillator), phase
detector, frequency divider. The VCO is used for generating a TS clock, and it
covers frequencies of 400 MHz to 800 MHz. The frequency divider divides the
clock by 65536 to 1.
The reference clocks consist of 27 MHz TCXO and half-divided output of
54 MHz clock generator. These clocks are used to compare the frequency of the
TS Clock Generator.
A20 PCI Backplane Board
The A20 PCI Backplane board consists of the following connectors and
circuitries:
The J100, J110, and J120 connectors are PCI slots for 5 V. The J130 connector is
a PCI slot for 3.3 V and is reserved in the future. The J100 connector is the
system slot and is used to install the CPU board (single board computer: SBC).
The J110 and J120 connectors are used to install the A12 Main board and a
optional interface board.
Interrupt Controller
TS Clock Generator
Reference Clocks
PCI and ISA Connectors
Summary of Contents for MTX100A
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Page 14: ...Service Safety Summary x MTX100A MPEG Recorder Player Service Manual ...
Page 16: ...Environmental Considerations xii MTX100A MPEG Recorder Player Service Manual ...
Page 21: ...Specifications ...
Page 22: ......
Page 24: ...Product Overview 1 2 MTX100A MPEG Recorder Player Service Manual ...
Page 39: ...Theory of Operation ...
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Page 51: ...Performance Verification ...
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Page 105: ...Maintenance ...
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Page 140: ...Removal and Installation Procedures 4 34 MTX100A MPEG Recorder Player Service Manual ...
Page 152: ...Troubleshooting 4 46 MTX100A MPEG Recorder Player Service Manual ...
Page 156: ...Using the Recovery Discs 4 50 MTX100A MPEG Recorder Player Service Manual ...
Page 157: ...Options ...
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Page 160: ...Options 5 2 MTX100A MPEG Recorder Player Service Manual ...
Page 161: ...Diagrams ...
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Page 164: ...Diagrams 6 2 MTX100A MPEG Recorder Player Service Manual ...
Page 166: ...6 4 MTX100A MPEG Recorder Player Service Manual ...
Page 168: ...6 6 MTX100A MPEG Recorder Player Service Manual ...
Page 173: ...Replaceable Parts List ...
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Page 190: ...Replaceable Parts List 7 16 MTX100A MPEG Recorder Player Service Manual ...