MC68EC030CFE25C Freescale Semiconductor, MC68EC030CFE25C Datasheet - Page 149
MC68EC030CFE25C
Manufacturer Part Number
MC68EC030CFE25C
Description
IC MPU 32BIT ENH 25MHZ 132-CQFP
Manufacturer
Freescale Semiconductor
Specifications of MC68EC030CFE25C
Processor Type
M680x0 32-Bit
Speed
25MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
132-CQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
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Part Number:
MC68EC030CFE25C
Manufacturer:
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6
6-12
p o r t size is 32 bits, the processor performs two accesses, one for each cache
With a 32-bit port, the same operation is shown in Figure 6-7. Only one read
cycle is required. All four bytes (including the requested byte) are latched
during the cycle.
controller attempts to fill both associated long-word cache entries. An ex-
The MC68030 first fetches the initial byte(s) of the operand (residing in the
first long word} and then requests the remaining bytes to fill that cache entry
If a requested access is misaligned and spans two cache entries, the bus
ample of this is an operand request for a long word on an odd-word boundary.
(if the port size is less than 32 bits) before it requests the remainder of the
operand and corresponding long word to fill the second cache entry. If the
entry.
CYCLE
CYCLE
2
1
WORD
BYTE
BYTE
SIZE
SIZE
Figure 6-6. Single Entry Mode Operation - - 16-Bit Port
Figure 6-7. Single Entry Mode Operation - - 32-Bit Port
ADDRESS
ADDRESS
$03
$00
$03
SOD
$00
MC68030 USER'S MANUAL
11111
$04
$04
- INCLUDES THE REQUESTED OPERAND AND THE PREVIOUS BYTE
- THE REMAINING WORD FOR THE LONG WORD CACHE ENTRY
- THE ENTIRE LONG WORD MUST BE VALID
$08
$08
COMMENT
COMMENT
$OC
$0C
MOTOROLA
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