MC68020 Motorola, MC68020 Datasheet - Page 220
MC68020
Manufacturer Part Number
MC68020
Description
(MC68020 / MC68EC020) MICROPROCESSORS USERS MANUAL
Manufacturer
Motorola
Datasheet
1.MC68020.pdf
(306 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68020CEH16E
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Company:
Part Number:
MC68020CEH25
Manufacturer:
XILINX
Quantity:
101
Company:
Part Number:
MC68020CEH25E
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Company:
Part Number:
MC68020CFC16E
Manufacturer:
MOT
Quantity:
190
Part Number:
MC68020CFC16E
Manufacturer:
MOTOROLA/摩托罗拉
Quantity:
20 000
Company:
Part Number:
MC68020CFC20E
Manufacturer:
FREESCALE
Quantity:
101
Company:
Part Number:
MC68020CFC25
Manufacturer:
FREESCALE
Quantity:
101
Company:
Part Number:
MC68020EH16E
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Company:
Part Number:
MC68020EH20E
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Part Number:
MC68020FC16E
Manufacturer:
MOTOROLA/摩托罗拉
Quantity:
20 000
- Current page: 220 of 306
- Download datasheet (2Mb)
Example 2
Using the same instruction stream, the second example demonstrates the different effects
of instruction execution overlap on instruction timing when the same instructions are
positioned slightly differently in 32-bit memory:
The assumptions for example 2 (see Figure 8-4) are:
Although the total execution time of the instruction segment does not change in this
example, the individual instruction times are significantly different. This example
demonstrates that the effects of overlap are not only instruction-sequence dependent but
are also dependent upon the alignment of the instruction stream in memory.
8-6
EXECUTION TIME
1. The data bus is 32 bits,
2. The first instruction is prefetched from an even-word address,
3. Memory access occurs with no wait states, and
4. The cache is disabled.
INSTRUCTION
CONTROLLER
SEQUENCER
COUNTER
ACTIVITY
CLOCK
CLOCK
BUS
BUS
LEGEND:
1
IDLE
PERFORM
MOVE #1
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)+
Address
Figure 8-4. Processor Activity for Example 2
(4)
WRITE
3
PERFORM
ADD #2
4
5
CALCULATE
SOURCE EA
MOVE #3
M68020 USER’S MANUAL
BYTES n + 8
ADD.L D4,D5
PREFETCH
PREFETCH
n + 4
n + 8
6
n
(3)
7
IDLE
DESTINATION
8
CALCULATE
MOVE #3
READ FROM (A1)
MOVE #1
MOVE #3
EA
READ
9
•••
MOVE.L (A1),–(A2)
10
IDLE
(6)
11
PERFORM
MOVE #3
WRITE TO –(A2)
ADD #2
ADD #4
WRITE
12
•••
13
PERFORM
ADD #4
14
BYTES n + 12
ADD.L D5,D6
PREFETCH
PREFETCH
INSTRUCTION
15
(3)
NEXT
MOTOROLA
16
17
Related parts for MC68020
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Motorola, Inc [VOLTAGE REGULATOR]
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
3N2046367254 MOTOROLA SC (XSTRS/R F)
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
MOTOROLA POWERPC 603e MICROPROCESSOR
Manufacturer:
Motorola
Part Number:
Description:
Motorola Semiconductor Datasheet Library
Manufacturer:
Motorola
Part Number:
Description:
SWITCHMODE Schottky Power Rectifier(POWERTAP III Package)
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
SWITCHMODE Schottky Power Rectifirer
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
Hybrid Power Module
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
Hybrid Power Module
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
Search -----> MTE53N50E
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
Hybrid Power Module
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
Hybrid Power Module
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
SCHOTTKY BARRIER RECTIFIER 200 AMPERES 60 VOLT
Manufacturer:
Motorola
Datasheet:
Part Number:
Description:
NPN SILICON POWER DARLINGTON TRANSISTOR
Manufacturer:
Motorola
Datasheet: