MC68EC000 Motorola, MC68EC000 Datasheet - Page 131

• Manufacturer Part Number: MC68EC000
• Description: Core Processor (SCM 68000)
• Manufacturer: Motorola

Electrical Characteristics
7.5 AC ELECTRICAL SPECIFICATIONS—CLOCK TIMING
7.6 AC ELECTRICAL SPECIFICATIONS—READ AND WRITE CYCLES
7-2
Num
11A
14
14A
17
21A
2,3 Clock Pulse Width
4,5 Clock Rise and Fall Times
Num
20A
11
13
15
21
22
1
6A
12
18
20
23
6
7
8
9
1,5
1,7
1
1
1
1
1
1
6
1
(Frequency = 0 to 20 MHz; GND = 0 V; T A = T L to T H ; see Figure 7-2 and Figure 7-3)
Frequency of Operation
Cycle Time
Clock High to Address Valid
Clock High to FC Valid
Clock High to Address, Data Bus High Impedance (Maximum)
(Write)
Clock High to Address, FC Invalid (Minimum)
Clock High to ASB, DSB Asserted
Address Valid to ASB, DSB Asserted (Read)/ ASB Asserted
(Write)
FC Valid to ASB, DSB Asserted (Read)/ASB Asserted (Write)
Clock Low to ASB, DSB Negated
ASB, DSB Negated to Address, FC Invalid
ASB and DSB Width Asserted (Read)/ASB Width Asserted
(Write)
DSB Width Asserted (Write)
ASB, DSB Width Negated (Read)/ASB Width Negated (Write)
ASB, DSB Negated to RWB Invalid
Clock High to RWB High (Read)
Clock High to RWB Low (Write)
ASB Asserted to RWB Low (Write)
Address Valid to RWB Low (Write)
FC Valid to RWB Low (Write)
RWB Low to DSB Asserted (Write)
Clock Low to Data-Out Valid (Write)
NOTE:
0.2 V DD
4
0.8 V DD
Timing measurements are referenced to and from a low voltage of 0.2 V
voltage of 0.8 V
should start outside and pass through the range such that the rise or fall will be linear
between 0.2 V
Figure 7-1. Clock Input Timing Diagram
Characteristic
Characteristic
Freescale Semiconductor, Inc.
EC000 CORE PROCESSOR USER’S MANUAL
For More Information On This Product,
DD
DD
and 0.8 V
, unless otherwise noted. The voltage swing through this range
Go to: www.freescale.com
DD
.
5
2
1
Min
100
—
40
40
10
50
50
25
10
—
—
—
0
0
1
1
5
0
0
0
Min
50
25
—
—
3.3 V
3
3.3 V
Max
20
20
25
—
20
—
—
20
—
—
—
—
—
20
20
10
—
—
—
20
Max
20.0
—
—
4
DD
and a high
(see Figure 7-1)
Min
100
40
40
10
50
50
25
10
—
—
—
—
Min
0
1
1
5
0
0
0
0
50
25
—
—
5.0 V
5.0 V
MOTOROLA
Max
20.0
Max
18
18
20
18
18
18
18
10
18
—
—
—
—
—
—
—
—
—
—
—
—
—
4
MHz
Unit
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns