BA PF
LT
*
12\11
* *
t
f
BAZ
MSI
Figure
17-35. PCI PTM 1
BAR
Register
(PCICO_PTM1 BAR)
31:12
BA
Base Address
Only corresponding bits in PCILO_PTM1 MS
These bits determine where in
PCI memory
that are set to 1 are
writable. Bits in
address space this region is
located. PCILO_PTM1 MS that are set to 0 cause
the corresponding Base Address register
bits to be
always
O.
PCILO_PTM1 MS must
be initialized by a
PLB master before any
PCI device is allowed to configure this
register.
11:4
BAZ Base Address Always Zero BAZ =
OxOO
because the minimum size of
this range is 4KB.
3
PF Prefetchable PR = 1 to indicate that prefetching is
allowed.
2:1
LT
Location Type
LT
=
ObOO
to indicate that the memory
space can be
located anywhere in the 32-
bit address space.
0
MSI
Memory Space Indicator MSI = 0 to indicate memory space, rather
than
I/O space.
17.5.3.15 PCI PTM 2 BAR (PCICO_PTM2BAR)
PCICO_PTM2BAR defines a second space in PCI memory space that is mapped to PLB space
(system memory or
ROM). Note that if PCICO_PTM2BAR is disabled using PCILO_PTM2MSA,
PCICO_PTM2BAR
cannot be written. Set PCICO_PTM2BAR to ° before disabling this bit. If disabled
in this
way,
reads to PCICO_PTM2BAR always return 0.
17-38 PPC405GP User's Manual
Preliminary
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