MC68EC040FE25A Freescale Semiconductor, MC68EC040FE25A Datasheet - Page 88
MC68EC040FE25A
Manufacturer Part Number
MC68EC040FE25A
Description
IC MPU 32BIT 25MHZ 184-CQFP
Manufacturer
Freescale Semiconductor
Series
M68000r
Specifications of MC68EC040FE25A
Processor Type
M680x0 32-Bit
Speed
25MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
184-CQFP
Core Size
32bit
Program Memory Size
8KB
Cpu Speed
25MHz
Digital Ic Case Style
CQFP
No. Of Pins
184
Supply Voltage Range
4.75V To 5.25V
Operating Temperature Range
0°C To
Rohs Compliant
Yes
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
Surface Mount
Pin Count
184
Package Type
CQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68EC040FE25A
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Part Number:
MC68EC040FE25A
Manufacturer:
MOTOROLA/摩托罗拉
Quantity:
20 000
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Both caches contain circuitry to automatically determine which cache line in a set to use
for a new line. The cache controller locates the first invalid line and uses it; if no invalid
lines exist, then a pseudo-random replacement algorithm is used to select a valid line,
replacing it with the new line. Each cache contains a 2-bit counter, which is incremented
for each access to the cache. The instruction cache counter is incremented for each half-
line accessed in the instruction cache. The data cache counter is incremented for each
half-line accessed during reads, for each full line accessed during writes in copyback
mode, and for each bus transfer resulting from a write in write-through mode. When a
miss occurs and all four lines in the set are valid, the line pointed to by the current counter
value is replaced, after which the counter is incremented.
4-4
SUPERVISOR
BIT
S
TRANSLATION
31
ADDRESS
CACHE
LA31–LA12
PAGE FRAME
PA31–PA12
LOGICAL ADDRESS
Freescale Semiconductor, Inc.
PA11–PA10
For More Information On This Product,
Figure 4-3. Caching Operation
TRANSLATED
PA31–PA10
PHYSICAL
ADDRESS
M68040 USER'S MANUAL
Go to: www.freescale.com
12
SET SELECT
PHYSICAL
PA9–PA4
SET 63
SET 0
SET 1
PAGE OFFSET
COMPARATOR
TAG
TAG
0
0
STATUS
STATUS
1
LINE 0
2
D0
D0
LINE 1
3
D1
D1
LINE 2
HIT 3
HIT 2
HIT 1
HIT 0
LINE 3
D2
D2
D3
D3
LOGICAL OR
MUX
LINE SELECT
MOTOROLA
INSTRUCTION
HIT
DATA OR
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