TC1796
Peripheral Units (Vol. 2 of 2)
Micro Second Channel (MSC)
User’s Manual 21-16 V2.0, 2007-07
MSC, V2.0
Figure 21-9 Data Repetition Mode Frame Examples with DSS.NPTF = 0011
B
Diagrams B to F in Figure 21-9 show the command frame insertion in Data Repetition
Mode.
In diagram B, a command frame has been requested during the first passive time frame
after the data frame, and is inserted at the next TRP. In diagram C and D, a command
frame has been requested during the second passive time frame, and is inserted at the
time reference point of the last nominal passive time frame.
When the length of a command frame has not the same length of the data frame (as in
diagrams B to F), a shortened passive time frame is inserted until the next TRP is
reached. This assures that the next data or normal passive time frame is again aligned
to a TRP.
Figure 21-10 is a flow diagram of the Data Repetition Mode. This diagram especially
shows the behavior of the data and command pending bits DSC.DP and DSC.CP. If both
frame pending bits are set (DSC.DP = DSC.CP = 1), the command frame will always be
sent first, followed by the data frame when the next TRP is reached (assuming no further
command frame has been requested).
When the last passive frame is transmitted, DSC.DP becomes set by hardware. This
triggers the start of a data frame when the next TRP is reached.
t
PTF
t
DF
1)
1)
1)
1)
1)
C
D
E
F
A
MCT05803
DFPTF
CF
PTF PTF PTF DF
PTF = Passive Time Frame
DF = Data Frame
CF = Command Frame
TRP = Time Reference Point
B
PTF PTF PTF DF PTF
DFPTF PTF PTF DF PTF PTF PTF DF PTF
CFDFPTF PTF PTF DF PTF PTF DF PTF
DFPTF PTF PTF PTF DF PTF
PTF
PTF CF
P
TF
DF PTF
DFPTF PTF PTF DF PTFPTF PTF CF DFPTF
DFPTF PTF PTF DF PTFPTF PTF CF
P
TF
PTFDF
TRP TRP TRP TRP TRP TRP TRP TRP TRPTRP TRP TRP
t
CF
1) These passive time frames are shortened.
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