Fujitsu MB90460 Series Hardware Manual page 385

CHAPTER 15 MULTI-PULSE GENERATOR
■ Block Diagram of Position Detection Circuit
NOISE
FILTER
SNI0
CIRCUIT
NOISE
SNI1
FILTER
CIRCUIT
NOISE
SNI2 FILTER
CIRCUIT
●
Comparison Circuit
The Comparison Circuit is used to compare the level of the position detection input (SNI2 to SNI0) with
RDA2 to RDA0 bits of the Output Data Register (OPDR: RDA2 to RDA0). If the selector is selected, a
data write time output signal is generated when a match is detected.
●
Edge Detect Circuit 0, 1, 2
Edge Detect Circuit 0, 1 and 2 are identical.
The Edge Detect Circuit is used to compare the edge of the position input (SNI2 to SNI0) with 3 different
kind of edge setting. If the selector is selected, a data write time output signal is generated when an
effective edge is detected at the one of SNI2 to SNI0 inputs.
●
Noise Filter
The Noise Filter is used to filter out the noise of the input signal in which there are 4 kind of sampling
clock for selection.
●
Selector
The Selector is used to select from either Edge Detect Circuit or Comparison Circuit to generate data write
time output signal to the Data Write Control Unit.
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Figure 15.2-5 Block Diagram of Position Detection Circuit
RDA2
RDA1
RDA0
COMPARISON
CIRCUIT
EDGE
DETECTION
CIRCUIT 0
CPE1
CPE0
EDGE
DETECTION
CIRCUIT 1
CPE1
CPE0
EDGE
DETECTION
CIRCUIT 2
CPE1
CPE0
SEE0
SELECTOR
SEE1
SEE2
WTIN1
CMPE