Motorola MCF5281 用户手册
33-10
MCF5282 User’s Manual
MOTOROLA
External Interface Timing Characteristics
33.7 External Interface Timing Characteristics
NOTE:
All processor bus timings are synchronous; that is, input
setup/hold and output delay with respect to the rising edge of a
reference clock. The reference clock is the CLKOUT output.
setup/hold and output delay with respect to the rising edge of a
reference clock. The reference clock is the CLKOUT output.
All other timing relationships can be derived from these values.
Table 33-9. SGFM Flash Module Life Characteristics
(V
DDF
= 2.7 to 3.6 V)
Parameter
Symbol
Value
Unit
Maximum number of guaranteed program/erase cycles
1
before failure
1
A program/erase cycle is defined as switching the bits from 1
→ 0 → 1.
P/E
10,000
2
2
Reprogramming of a Flash array block prior to erase is not required.
Cycles
Data retention at average operating temperature of 85
°C
Retention
10
Years
Table 33-10. Processor Bus Input Timing Specifications
Name
Characteristic
1
1
Timing specifications have been indicated taking into account the full drive strength for the pads.
Symbol
Min
Max
Unit
B0
CLKOUT
t
CYC
12.5
—
ns
Control Inputs
B1a
Control input valid to CLKOUT high
2
2
TEA and TA pins are being referred to as control inputs.
t
CVCH
10
—
ns
B1b BKPT valid to CLKOUT high
3
3
Refer to figure A-19.
t
BKVCH
10
—
ns
B2a
CLKOUT high to control inputs invalid
t
CHCII
0
—
ns
B2b
CLKOUT high to asynchronous control input BKPT invalid
3
t
BKNCH
0
—
ns
Data Inputs
B4
Data input (D[31:0]) valid to CLKOUT high
t
DIVCH
6
—
ns
B5
CLKOUT high to data input (D[31:0]) invalid
t
CHDII
0
—
ns