MC68020EH25E Freescale Semiconductor, MC68020EH25E Datasheet - Page 221
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MC68020EH25E
Manufacturer Part Number
MC68020EH25E
Description
IC MPU 32BIT 33MHZ 132-PQFP
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68020EH16E.pdf
(306 pages)
Specifications of MC68020EH25E
Processor Type
M680x0 32-Bit
Speed
25MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
132-MQFP, 132-PQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68020EH25E
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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Example 3
Both Figures 8-3 and 8-4 show instruction execution without benefit of the
MC68020/EC020 instruction cache. Figure 8-5 shows a third example for the same
instruction stream executing in the cache. Note that once the instructions are in the cache,
the original location in external memory is no longer a factor in timing.
The assumptions for Example 3 are:
Figure 8-5 illustrates the benefits of the instruction cache. The total number of clock cycles
is reduced from 16 to 12 clocks. Since the instructions are resident in the cache, the
instruction prefetch activity does not require the bus controller to perform external bus
cycles. Since prefetch occurs with no delay, the bus controller is idle more often.
Example 4
Idle clock cycles, such as those shown in example 3, are useful in MC68020/EC020
systems that require wait states when accessing external memory. This fact is illustrated
in example 4 (see Figure 8-6) with the following assumptions:
MOTOROLA
1. The data bus is 32 bits,
2. The cache is enabled and instructions are in the cache, and
3. Memory access occurs with no wait states.
1. The data bus is 32 bits,
2. The cache is enabled and instructions are in the cache, and
3. Memory access occurs with one wait state.
EXECUTION TIME
INSTRUCTION
CONTROLLER
SEQUENCER
COUNTER
ACTIVITY
CLOCK
CLOCK
BUS
BUS
Figure 8-5. Processor Activity for Example 3
LEGEND:
1
IDLE
Freescale Semiconductor, Inc.
PERFORM
MOVE #1
For More Information On This Product,
MOVE.L D4,(A1)+
2
1) MOVE.L D4,(A1)+
2) ADD.L D4,D5
3) MOVE.L (A1),–(A2)
4) ADD.L D5,D6
WRITE TO (A1)+
(4)
WRITE
3
PERFORM
Go to: www.freescale.com
ADD #2
M68020 USER’S MANUAL
4
5
IDLE
CALCULATE
SOURCE EA
MOVE #3
6
READ FROM (A1)
DESTINATION
7
READ
CALCULATE
MOVE.L (A1),–(A2)
MOVE #3
EA
8
(7)
9
PERFORM
MOVE #3
WRITE TO –(A2)
10
WRITE
11
PERFORM
ADD #4
12
ADD.L
D5,D6
IDLE
(1)
13
8- 7
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