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參數(shù)資料

型號(hào)：	AN2933
英文描述：	Understanding the eTPU Channel Hardware
中文描述：	理解硬件頻道的eTPU
文件頁數(shù)：	27/40頁
文件大小：	741K
代理商：	AN2933

Channel Modes

Understanding the eTPU Channel Hardware, Rev. 0

Freescale Semiconductor

3.11 Ordered Matches, Single Transition

In the

Match2OrderedSingleBlockingTransition()

(m2_o_st) mode, Match A must occur before any other

channel event. It does not generate a service request, but the MRLA flag will be set. Thereafter, either

Match B or Transition A may occur and will request service, but if Transition A occurs first, it blocks a

subsequent Match B. Transition B may follow Transition A, and will set TDLB but will not request

service.

This and the following mode are the only ones where the matches are ordered, and they can be useful to

check elapsed time against elapsed angle in a rotating machine. In addition, if the match registers are set

to the same time, and greater-or-equal matches are selected, the channel can produce a pulse exactly one

microcycle wide.

In an input function, the matches provide an absolute acceptance window for an input transition. If TDLA

is set, the transition occurred after Match A and before Match B.

3.12 Ordered Matches, Double Transition

In the

Match2OrderedDoubleTransition()

(m2_o_dt) mode, Match A must occur before any other channel

action is enabled. Thereafter a pulse (double transition) may be detected, and the second transition (B) will

request service. If the Match B occurs before the second transition, it will block subsequent transitions and

issue a service request.

The ordered matches differ from the

Match2DoubleTransition()

mode in that the TDLs will not be set after

the Match B. This takes some ambiguity out of selecting the service thread, as shown in

Table 8

3.13 Single Match, Single Transition, Enhanced

SingleMatchSingleTransitionEnhanced()

(sm_st_e) mode, the Capture B register continually captures

the time of the IPACA transitions on the input of the channel digital filter. When the filter conditions are

satisfied and the signal passes through the filter, the TDLA is set and Capture A records the time of the

Table 8. Ordered Matches, Double Transition (See

Figure 6

)

Pulse

Service Request Vectors

SR Time

MRLA

MRLB

TDLA

TDLB