Fujitsu 8FX Hardware Manual page 410

CHAPTER 21 MULTI-PULSE GENERATOR
21.2 Block Diagram
■ Block Diagram of Position Detection Circuit
Figure 21.2-5 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 RDA[2:0] bits in the 16-bit MPG output data register (upper) (OPDUR). 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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RDA2
RDA1
RDA0
COMPARISON
CIRCUIT
EDGE
DETECTION
CIRCUIT 0
CPE1
CPE0
EDGE
DETECTION
CIRCUIT 1
CPE1
CPE0
EDGE
DETECTION
CIRCUIT 2
CPE1
CPE0
FUJITSU SEMICONDUCTOR LIMITED
MB95630H Series
SEE0
SEE1
SEE2
WTIN1
SELECTOR
CMPE
MN702-00009-2v0-E