MC68030RC25C Freescale Semiconductor, MC68030RC25C Datasheet - Page 360

• Manufacturer Part Number: MC68030RC25C
• Description: IC MPU 32BIT ENHANCED 128-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68030RC25C

• Processor Type: M680x0 32-Bit
• Speed: 25MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 128-PGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

9.7.4 M M U Status Register
MOTOROLA
The MMU status register (MMUSR) is a 16-bit register that contains the status
LOGICAL ADDRESS MASK
information returned by execution of the PTEST instruction. The PTEST in-
struction searches either the ATC (PTEST with level 0) or the translation tables
(PTEST with levels of 1-7) to determine status information about the trans-
lation of a specified logical address. The MMUSR is shown in Figure 9-38.
This 8-bit field contains a mask for the LOGICAL ADDRESS BASE field.
ADDRESS BASE field to be ignored. Blocks of memory larger than 16
to define contiguous blocks larger than 16 Mbytes, although this is not
Setting a bit in this field causes the corresponding bit of the LOGICAL
Mbytes can be transparently translated by setting some of the logical ad-
dress mask bits to ones. Normally, the low-order bits of this field are set
required.
Figure 9-38. MMU Status Register (MNlUSR) Format
15
B
14
L
S - - SUPERVISOR-ONLY
B - - BUS ERROR
L --- LIMIT VIOLATION
W - -
13
S
W R I T E . P R O T E C T E D
MC68030 USER'S MANUAL
12
0
11
W
10
I
M
9
8
0
7
0
6
T
I - - INVALIO
M - - MODIFIED
T - - TRANSPARENT ACCESS
N - - NUMBER OF LEVELS
0
0
3
0
N
0
9-59