MC68020EH25E Freescale Semiconductor, MC68020EH25E Datasheet - Page 67
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
- Current page: 67 of 306
- Download datasheet (3Mb)
5.2.3 Effects of Dynamic Bus Sizing and Operand Misalignment
The combination of operand size, operand alignment, and port size determine the number
of bus cycles required to perform a particular memory access. Table 5-6 lists the number
of bus cycles required for different operand sizes to different port sizes with all possible
alignment conditions for read/write cycles.
Table 5-6 reveals that bus cycle throughput is significantly affected by port size and
alignment. The MC68020/EC020 system designer and programmer should be aware of
and account for these effects, particularly in time-critical applications.
5-20
31
D31
OP0
MSB
OP1
XXX
*
Instruction prefetches are always two words from a long-word boundary
Instruction
Byte Operand
Word Operand
Long-Word Operand
Figure 5-17. Misaligned Long-Word Operand Read
LONG-WORD OPERAND (REGISTER)
Operand Size
OP1
UMB
OP2
Table 5-6. Memory Alignment and Port Size
XXX
LONG-WORD MEMORY
*
Freescale Semiconductor, Inc.
Influence on Read/Write Bus Cycles
DATA BUS
For More Information On This Product,
from Long-Word Port Example
M68020 USER’S MANUAL
LMB
XXX
OP3
OP2
Go to: www.freescale.com
1:2:4
1:1:1
1:1:2
1:2:4
(Data Port Size = 32 Bits:16 Bits:8 Bits)
00
Number of Bus Cycles
OP0
LSB
XXX
OP3
1:1:1
1:2:2
2:3:4
N/A
01
A1, A0
D0
0
SIZ1 SIZ0 A2
0
1
1:1:1
1:1:2
2:2:4
N/A
10
MC68020/EC020
0
1
0
1
A1
1
0
1:1:1
2:2:2
2:3:4
N/A
11
A0
1
0
MEMORY CONTROL
DSACK1
L
L
MOTOROLA
DSACK0
L
L
Related parts for MC68020EH25E
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
(MC600 Series) INTEGRATED CIRCUITS
Manufacturer:
ETC
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet: