PXR40RM Datasheet, PDF (248/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

System Integration Unit (SIU)
7.3.1.23 Chip Configuration Register (SIU_CCR)
The SIU_CCR controls the chip configuration for enabling and disabling Nexus on the external bus
interface.
Address: SIU_BASE + 0x0980
Access: R/W
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 MATCH DISNEX
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0
X¹
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
31
R0 0 0 0 0 0 0 0 0 0 0 0 0 0
0
TEST
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0
0
1 _{When system RESET negates, the value in this bit depends on the censorship control word and the boot}
configuration bits.
Figure 7-21. Chip Configuration Register (SIU_CCR)
The following table describes the chip configuration fields:
Table 7-43. SIU_CCR Bit Field Descriptions
Field
Description
0–13
14
MATCH
15
DISNEX
16–30
31
TEST
Reserved
Compare register match. Holds the value of the match input signal to the SIU. The
match input is asserted if the values in SIU_CBRH and SIU_CBRL are the same as
the public password stored in flash, 0xFEED_FACE_CAFE_BEEF. The MATCH bit is
reset by the internal reset condition.
0 Match input signal is negated
1 Match input signal is asserted
Disable Nexus. 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.
Reserved
Test mode enable. Allows reads or writes to undocumented registers used only for
production tests. Since these production test registers are undocumented, estimating
the impact of errant accesses to them is impossible. Do not change this bit from its
negated state at reset.
0 Undocumented production test registers cannot be read or written.
1 Undocumented production test registers can be read or written.
7-66
PXR40 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor