NXP Semiconductors MPC5644A, Reference Manual, Page: 541 / 1735

System Integration Unit (SIU)
MPC5644A Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor 541
16.6.25 Chip Configuration Register (SIU_CCR)
Figure 16-210. Chip Configuration Register (SIU_CCR)
SI 0x980
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
R
0 0 0 0 0 0 0 0 0 0 0 0 0 0
MA
TCH
D
ISNEX
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 U
1
1
During reset the comparison is performed and result is uncertain
U
2
2
The value after reset is uncertain
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R
0 0 0 0 0 0 0 0 0 0 0 0 0 0
CR
S
E
0
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
= Unimplemented or Reserved
Table 16-215. SIU_CCR field description
Field Description
0:13 Reserved
14
MATCH
Compare Register Match. The MATCH bit is a read only bit that holds the value of the match input
signal to the SIU. The match bit is asserted if the password in shadow flash memory and the contents
of the SIU_CBRH/SIU_CBRL registers are equal.
0 Match input signal is negated
1 Match input signal is asserted
15
DISNEX
Disable Nexus. The DISNEX bit is a read only bit that holds the value of the Nexus disable input signal
to the SIU. When system reset negates, the value in this bit depends on the censorship control word
and the boot configuration bits.
0 Nexus disable input signal is negated
1 Nexus disable input signal is asserted
16:29 Reserved
30
CRSE
Calibration Reflection Suppression Enable. The CRSE bit enables the suppression of reflections from
the EBI’s calibration bus onto the non-calibration bus. The EBI drives some outputs to both the
calibration and non-calibration busses. When CRSE is asserted, the values driven onto the calibration
bus pins will not be reflected onto the non-calibration bus pins. When CRSE is negated, the values
driven onto the calibration bus pins will be reflected onto the non-calibration bus pins.
CRSE only enables reflection suppression for non-calibration bus pins which do not have a negated
state to which the pins return at the end of the access. CRSE does not enable reflection suppression
for the non-calibration bus pins which have a negated state to which the pins return at the end of an
access. Those reflections always are suppressed. Furthermore, the suppression of reflections from the
non-calibration bus onto the calibration bus is not enabled by CRSE. Those reflections are also always
suppressed.
0 Calibration reflection suppression is disabled
1 Calibration reflection suppression is enabled
31 Reserved