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CHAPTER 6 FG Input
6.1 Overview of FG Input
The Frequency Generate (FG) input section comprises of the capstan input, drum input,
and reel input sections. Each input section performs division of the input FG signal,
generation of signals to be input to the FRC capture section and masking of the
predetermined period.
■ Capstan Input
The capstan input consists of the following 6 items.
• Capstan control register
• Capstan input control register
• Capstan mask timer control register
• Multiplying circuit
• 8 -bit programmable divider
• Mask timer
■ Drum Input
The drum input consists of the following 5 items.
• Drum control register
• Drum input control register
• Drum mask timer control register
• 4-bit programmable divider
• Mask timer
■ Reel Input
The reel input consists of the following 7 items.
• Reel control register
• Reel 0 input control register
• Reel 0 mask timer control register
• Reel 1 input control register
• Reel 1 mask timer control register
• 8-bit programmable divider
• Mask timer