MC68EN360AI25VL Freescale, MC68EN360AI25VL Datasheet - Page 87
MC68EN360AI25VL
Manufacturer Part Number
MC68EN360AI25VL
Description
Manufacturer
Freescale
Datasheet
1.MC68EN360AI25VL.pdf
(962 pages)
Specifications of MC68EN360AI25VL
Family Name
M68000
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
25MHz
Instruction Set Architecture
RISC
Operating Supply Voltage (max)
3.3V
Operating Supply Voltage (min)
2.7V
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
240
Package Type
FQFP
Lead Free Status / RoHS Status
Compliant
Available stocks
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Quantity
Price
Company:
Part Number:
MC68EN360AI25VL
Manufacturer:
Freescale Semiconductor
Quantity:
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Part Number:
MC68EN360AI25VL
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Figure 4-6 shows a word transfer to an 8-bit bus port. Like the preceding example, this
example requires two bus cycles. Each bus cycle transfers a single byte. The size signals
for the first cycle specify two bytes; for the second cycle, they specify one byte. Figure 4-7
shows the associated bus transfer signal timing.
4.2.2 Misaligned Operands
Since operands may reside at any byte boundaries, they may be misaligned. A byte operand
is properly aligned at any address; a word operand is misaligned at an odd address; a long
word is misaligned at an address that is not evenly divisible by four. The MC68302,
MC68000/MC68008, MC68010, and MC68340 implementations allow long-word transfers
on odd-word boundaries but force exceptions if word or long-word operand transfers are
attempted at odd-byte addresses. Although the QUICC does not enforce any alignment
restrictions for data operands (including PC relative data addresses), some performance
degradation occurs when additional bus cycles are required for long-word or word operands
Figure 4-5. Long-Word Operand Write Timing (16-Bit Data Port)
FC3–FC0
D23–D16
D31–D24
DSACK0
DSACK1
A31–A2
CLKO1
SIZ0
SIZ1
R/W
AS
DS
A0
A1
Freescale Semiconductor, Inc.
For More Information On This Product,
S0
MC68360 USER’S MANUAL
Go to: www.freescale.com
WORD WRITE
S2
LONG-WORD OPERAND WRITE TO 16-BIT PORT
0P0
0P1
S4
S0
WORD WRITE
S2
0P3
0P2
S4
Bus Operation
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