Figure 9-56. Power-Up Sequencing With Pwrbtn# Timing Diagram; Table 9-46. Power-Up Sequence Using The Power Button Timing Parameters - AMD Geode SC1200 Data Book

Electrical Specifications
9.3.16 Power-Up Sequencing

Table 9-46. Power-Up Sequence Using the Power Button Timing Parameters

Symbol Parameter
t Voltage sequence
1
t PWRBTN# inactive after V
2
applied, whichever is applied last
t PWRBTN# active pulse width
3
t ONCTL# inactive after V
4
t Signal active after PWRBTN active
5
t V and V
6 CORE
active
t POR# inactive after V
7
applied
V
SBL
V
SB
V
CORE
V
IO
PWRBTN#
ONTCL#
PWRCNT[2:1]
POR#

Figure 9-56. Power-Up Sequencing With PWRBTN# Timing Diagram

AMD Geode™ SC1200/SC1201 Processor Data Book
or V
SB SBL
applied
SB
applied after ONCTL#
IO
and V
CORE IO
t
1
t
2
t
4
Min Max Unit
-100 100 ms
0 1 µs
16 4000 ms
0 1 ms
14 16 ms
0 ms
50 ms
t
1
t
6
t
3
t
5
32579B
Comments
Optimum power-up results with
t = 0.
1
PWRBTN# is an input and must
be powered by V .
SB
If PWRBTN# max is exceeded,
ONCTL# will go inactive.
System determines when V
and V are applied, hence there
IO
is no maximum constraint.
POR# must not glitch during
active time.
t
7
CORE
433