MC68EC040RC25 Freescale Semiconductor, MC68EC040RC25 Datasheet - Page 86
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MC68EC040RC25
Manufacturer Part Number
MC68EC040RC25
Description
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68EC040RC25.pdf
(442 pages)
Specifications of MC68EC040RC25
Family Name
M68000
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
25MHz
Instruction Set Architecture
RISC
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Through Hole
Pin Count
179
Package Type
PGA
Lead Free Status / Rohs Status
Supplier Unconfirmed
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memory is always updated through an external bus access after updating the cache,
keeping memory and cached data consistent.
4.1 CACHE OPERATION
Both four-way set-associative caches have 64 sets of four 16-byte lines. There are two
formats that define each cache line, an instruction cache line format and a data cache line
format. Each format contains an address tag consisting of the upper 22 bits of the physical
address, status information, and four long words (128 bits) of data. The status information
for the instruction cache line address tag consists of a single valid bit for the entire line.
The status information for the data cache line address tag contains a valid bit and four
additional bits to indicate dirty status for each long word in the line. Note that only the data
cache supports dirty cache lines. Figure 4-2 illustrates the instruction cache line format (a)
and the data cache line format (b).
4-2
POINT UNIT
FLOATING-
CONVERT
EXECUTE
WRITE-
BACK
INSTRUCTION
CALCULATE
WRITEBACK
EXECUTE
INTEGER
DECODE
FETCH
FETCH
UNIT
EA
EA
Figure 4-1. Overview of Internal Caches
Freescale Semiconductor, Inc.
For More Information On This Product,
M68040 USER'S MANUAL
OPERAND DATA BUS
Go to: www.freescale.com
INSTRUCTION
INSTRUCTION DATA BUS
DATA
ATC
ATC
INSTRUCTION MEMORY UNIT
MMU/CACHE/SNOOP
MMU/CACHE/SNOOP
DATA MEMORY UNIT
INSTRUCTION
CONTROLLER
CONTROLLER
DATA
INSTRUCTION
CACHE
CACHE
DATA
INSTRUCTION
ADDRESS
ADDRESS
DATA
B
U
S
C
O
N
R
O
E
R
T
L
L
MOTOROLA
ADDRESS
CONTROL
SIGNALS
DATA
BUS
BUS
BUS
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