MC68060RC50 Freescale Semiconductor, MC68060RC50 Datasheet - Page 81

IC MPU 32BIT 50MHZ 206-PGA

MC68060RC50

Manufacturer Part Number
MC68060RC50
Description
IC MPU 32BIT 50MHZ 206-PGA
Manufacturer
Freescale Semiconductor
Datasheets

Specifications of MC68060RC50

Processor Type
M680x0 32-Bit
Speed
50MHz
Voltage
3.3V
Mounting Type
Surface Mount
Package / Case
206-PGA
Family Name
M68000
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
50MHz
Instruction Set Architecture
RISC
Supply Voltage 1 (typ)
3.3V
Operating Supply Voltage (max)
3.465V
Operating Supply Voltage (min)
3.135V
Operating Temp Range
0C to 110C
Operating Temperature Classification
Commercial
Mounting
Through Hole
Pin Count
206
Package Type
PGA
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Features
-
Lead Free Status / Rohs Status
Compliant

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Memory Management Unit
have an encoding of U-bit = 0, M-bit = 1, and PDT field = 01 or 11. This encoding indicates
that the page descriptor is resident, not used, and modified. The processor’s table search
algorithm never leaves a descriptor in this state. This state is possible through direct manip-
ulation by the operating system for this specific instance.
4.2.2 Descriptors
There are three types of descriptors used in the translation tables, root, pointer, and page.
Root table descriptors are used in root-level tables and pointer table descriptors are used in
pointer-level tables. Descriptors in the page-level tables contain either a page descriptor for
the translation or an indirect descriptor that points to a memory location containing the page
descriptor. The P-bit in the TCR selects the page size as either 4 or 8 Kbytes.
4.2.2.1 TABLE DESCRIPTORS. Figure 4-10 illustrates the formats of the root and pointer
table descriptors.
4.2.2.2 PAGE DESCRIPTORS. Figure 4-11 illustrates the page descriptors for both
4-Kbyte and 8-Kbyte page sizes. Refer to Section 5 Caches for details concerning caching
page descriptors.
4-12
ROOT TABLE DESCRIPTOR (ROOT LEVEL)
POINTER TABLE DESCRIPTOR (POINTER LEVEL)
4K PAGE DESCRIPTOR (PAGE LEVEL)
8K PAGE DESCRIPTOR (PAGE LEVEL)
INDIRECT PAGE DESCRIPTOR (PAGE LEVEL)
31
31
31
31
31
PHYSICAL ADDRESS
PHYSICAL ADDRESS
POINTER TABLE ADDRESS
Figure 4-10. Table Descriptor Formats
Figure 4-11. Page Descriptor Formats
PAGE TABLE ADDRESS
M68060 USER’S MANUAL
DESCRIPTOR ADDRESS
13 12 11 10
UR UR G U1 U0
12 11 10
UR G U1 U0
9
9
9
9
8
X
X
8
8
8
X
X
S
S
7
7
7
7
7
6
X
6
X
6
6
6
CM
CM
5
X
5
X
5
5
5
M
M
X
X
4
4
4
4
4
MOTOROLA
U
U
U
U
3
3
3
3
3
W
W
W
W
2
2
2
2
2
1
1
1
1
1
UDT
UDT
PDT
PDT
PDT
0
0
0
0
0

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