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31
0
SHIFTBUFi
SHIFTERi
timer_shift_pos
S
FXIO_D0
S
FXIO_Dn
S = synchronizer
PINSEL,
PINWIDTH
S1
out
INSRC
PINPOL
4
timer_shift_neg
TIMPOL
FXIO_Dx
1
2
3
MA
SK
SSTART,
SSTOP
PINCFG
Logic Output
Figure 22-4. Logic Microarchitecture
The look-up table is driven using 4 pin inputs (maskable using SHIFTCFG[SSTOP] and
SHFITCFG[SSTART]) plus 1 input from the internal shifter and can be configured to
drive an output pin using the SHIFTCTL[PINCFG] field. Pin inputs and outputs are fixed
for each logic look-up table and are not selectable. The following table lists the logic
output value selected by the look-up table for Shifter 'i'.
Table 22-3. Logic Look-up table for Shifter 'i'
SHIFTERi[0]
FXIO_D[x+3]
FXIO_D[x+2]
FXIO_D[x+1]
FXIO_D[x]
Logic Output to
FXIO_D[x+4]
0
0
0
0
0
SHIFTBUFi[0]
0
0
0
0
1
SHIFTBUFi[1]
0
0
0
1
0
SHIFTBUFi[2]
0
0
0
1
1
SHIFTBUFi[3]
...
...
...
...
...
...
1
1
1
1
1
SHIFTBUFi[31]
1. for Shifter i=0...3, x=i
for Shifter i=4...7, x=i+4
To minimize output glitches, SHIFTCFG[SSTOP] and SHIFTCFG[SSTART] can be
used to mask unused input pins. When set, {SSTOP[1:0], SSTART[1:0]} will mask
FXIO_D[x+3]...FXIO_D[x] inputs respectively, so that any transitions on these pins will
not cause the logic output to glitch.
Note that other shifters/timers could potentially be configured to drive the input pins of a
given look-up table (without synchronization), allowing the user to concatenate look-up
tables or create complex combinations of shifters/timers as desired.
Functional description
K32 L2A Reference Manual, Rev. 2, 01/2020
570
NXP Semiconductors
Содержание K32 L2A Series
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