
436
AMD Geode™ SC2200 Processor Data Book
Electrical Specifications
32580B
9.3.15
Power-Up Sequencing
Figure 9-55. Power-Up Sequencing With PWRBTN# Timing Diagram
Table 9-44. Power-Up Sequence Using the Power Button Timing Parameters
Symbol
Parameter
Min
Max
Unit
Comments
t
1
Voltage sequence
-100
100
ms
Optimum power-up results with
t
1
= 0.
t
2
PWRBTN# inactive after V
SB
or V
SBL
applied, whichever is applied last
0
1
µs
PWRBTN# is an input and must
be powered by V
SB
.
t
3
PWRBTN# active pulse width
16
4000
ms
If PWRBTN# max is exceeded,
ONCTL# will go inactive.
t
4
ONCTL# inactive after V
SB
applied
0
1
ms
t
5
Signal active after PWRBTN active
14
16
ms
t
6
V
CORE
and V
IO
applied after ONCTL#
active
0
ms
System determines when V
CORE
and V
IO
are applied, hence there
is no maximum constraint.
t
7
POR# inactive after V
CORE
and V
IO
applied
50
ms
POR# must not glitch during
active time.
t
1
V
SBL
V
SB
V
CORE
V
IO
PWRBTN#
ONTCL#
PWRCNT[2:1]
POR#
t
4
t
2
t
3
t
1
t
6
t
5
t
7
Содержание Geode SC2200
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