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System Integration Module (SIM60)
6-70
MC68360 USER’S MANUAL
master may generate a bus error as a result of this register, and for parity errors, the PERR
pin may be externally connected to an interrupt input.
Bits 15–9—Reserved
WPER—Write Protect Error
This bit is asserted when a write protect error occurs. A bus monitor (BERR assertion) will
(if enabled) prompt the user to read this register if no DSACK is provided on a write cycle.
The accessed address will be in the BERR exception descriptor. WPER is cleared by writ-
ing one to this bit or by performing a system reset. Writing a zero has no effect on WPER.
PERx—Parity Error
These bits indicate that a parity error was detected when reading from bank N. BERR is
internally asserted if PBEE in the GMR is set and if an internal master performs this cycle.
The PERR signal is continuously asserted until all PERx bits are cleared. PERx is cleared
by writing one or by performing a system reset. Writing a zero has no effect on PERx.
NOTE
If external masters of the MC68030-type (including QUICCs) are
chosen to be asynchronous (configured by clearing the SYNC
bit in the GMR), then they have no parity support.
6.13.3 Base Register (BR)
This register is used for both DRAM and SRAM banks. Most bits are valid for both the DRAM
and SRAM banks, but some bits are only valid for SRAM banks. This register is a 32-bit
read-write register that may be accessed at any time.
V—Valid Bit
This bit indicates that the contents of the BR and OR pair are valid. The CS/RAS signal
will not assert until the V-bit is set.
15
14
13
12
11
10
9876543210
———————
WPER
PER7
PER6
PER5
PER4
PER3
PER2
PER1
PER0
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
BA31
BA30
BA29
BA28
BA27
BA26
BA25
BA24
BA23
BA22
BA21
BA20
BA19
BA18
BA17
BA16
000000000
0
0000
0
15
14
13
12
11
10
9
8
7
6
5432
1
0
BA15
BA14
BA13
BA12
BA11
FC3
FC2
FC1
FC0
TRLXQ
BACK40
CSNT40
CSNTQ
PAREN
WP
V
000000000
1
0100
0
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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