22 FLK5 Master 5 PLBO_BESR Field Lock
o Master 5 PLBO_BESR field is unlocked
1 Master 5 PLBO_BESR field is locked
23 ALK5 Master 5 PLBO_BEAR Address Lock
o Master 5 PLBO_BEAR is unlocked
1 Master 5 PLBO_BEAR is locked
24:31 Reserved
2.1.7 PLB
to
OPB
Bridge
Registers
The PLB to OPB bridge registers are DCRs accessed using the
mfdcr
and
mtdcr
instructions.
Table 2-4 lists the
PLB to OPB bridge registers.
Table 2-4. PLB
Arbiter
Registers
Mnemonic
Register
Name
Address
Access
Page
POBO_BEAR
Bridge Error Address Register
OxOA2
RIO
2-5
POBO_BESRO
Bridge Error Status Register 0
OxOAO
R/Clear 2-5
(Master
IDs 0,1, 2, 3)
POBO_BESR1
Bridge Error Status Register
OxOA4
R/Clear
2-6
(Master
IDs
4,
5)
2.1.7.1 Bridge Error Address Register (POBO_BEAR)
The read-only POBO_BEAR reports the address of a PLB to OPB transfer that results
in
an error. The
PLB to OPB bridge writes the error address
in
the POBO_BEAR, unless the associated
POBO_BESRm[ALCKn] field is set (m is either a or
1,
depending on the master ID specified by n).
Once locked, the PLB to OPB bridge cannot write POBO_BEAR until all POBO_BESRm[ALCKn] fields
that are set are cleared.
1
0
Figure
2-5."
Bridge
Error
Address
Register
(POBO_BEAR)
1 0:31
I'
OxOB2
1 Address of bus error
2.1.7.2 Bridge Error Status Registers (POBO_BESRO-POBO_BESR1)
The PLB to OPB bridge writes error information into the appropriate POBO_BESRm register. (For
master
IDs 0,
1,2,
and
3,
m =
0;
for master IDs 4 and
5,
m = 1.)
POBO_BESRm fields can be locked using the POBO_BESRm[FLKn] and POBO_BESRm[ALKn] fields
(n is the master ID). Once locked, the POBO_BESRm fields associated with a master cannot be
overwritten if a subsequent error occurs until the locking fields are cleared.
To
clear a lock, write 1 to
2-8
PPC405GP User's Manual Preliminary
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