參數(shù)資料
型號： AN2897
英文描述： Using the eTPU Angle Clock
中文描述： 使用時鐘角的eTPU
文件頁數(shù)： 19/32頁
文件大?。?/td> 587K
代理商： AN2897
eTPU Software Design
Using the eTPU Angle Clock, Rev. 0
Freescale Semiconductor
19
4.2
State Machine Description
Table 1
shows a simplified state table for an Angle Clock system, similar to the implementation in the
Reference Design. The states are referenced in the following description of an angle clock system
implementation.
Table 1. Angle Clock System State
S
Reference
Name
Action
Exit Condition
G
InitializeCrank
TICKS = TicksPerToot - 1
If ActiveEdge
ToothCount
=
0
CrankStatus
=
Stall;
First_edge
CrankStatus
=
WaitingGap
If timeout (StallTimer)
StallTimer =
StallPeriod
at startpoint Time(activeEdge)
If ActiveEdge
ToothTime
= Time(ActiveEdge)
First Period
StallTimer =
StallPeriod
at startpoint Time(activeEdge)
If ActiveEdge
Period
= Time(ActiveEdge) -
ToothTime
If timeout (StallTimer)
ToothTime
= Time(ActiveEdge)
ToothCount
+= 1
TickRate =
Period
/TicksPerTooth
BlankTimer =
Period
*
BlankingRatio
Testing_Possible_Gap StallTimer =
StallPeriod
at startpoint Time(activeEdge)
If
Period
>
GapRatio
*
PeriodLast
PeriodLast =
Period
If ActiveEdge
Period
= Time(ActiveEdge) -
ToothTime
If timeout (StallTimer)
ToothTime
= Time(ActiveEdge)
ToothCount += 1
TickRate =
Period
/TicksPerTooth
BlankTimer =
Period
*
BlankingRatio
Apparent_Gap
Period
= PeriodLast
If ActiveEdge
TickRate =
Period
/TicksPerTooth
If timeout (StallTimer)
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