TC1784
Direct Memory Access Controller (DMA)
User´s Manual
11-40
V1.1, 2011-05
DMA, V3.03
11.2.13.1 Pattern Compare Logic
Read move data and compare match patterns are compared on a bit-wise level. The
logic as shown in
is implemented in each COMP block of
,
. One COMP block controls either 8 bits or 16 bits of
data and makes it possible to mask each data bit for the compare operation.
In the compare logic for one bit of the COMP block, a data bit from register ME0R is
compared to the corresponding pattern bit stored in register ME0PR. If both bits are
equal and a pattern mask bit stored in another part of register ME0PR is 0, the compare
matched condition becomes active. When the pattern mask bit is set to 1, the compare
matched condition is always active (set) for the related bit. When the compare matched
conditions for each bit within a COMP block are true, the compare match output line of
the COMP block becomes active.
Figure 11-22 Pattern Compare Logic (COMP Block)
MCA06170
&
Data from
ME0PR
Register
Mask from
ME0PR
Register
Compare Logic for 1 Bit
Compare Logics
of other Bits
Data from
ME0R
Register
=1
Mask
Compare
Match
Output
1
n
n
n
≥
1
Содержание TC1784
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