Advanced I/O Controller with Motherboard GLUE Logic
Datasheet
Start of Suspend Power Up
Sequence
nBACKFEED_CUT = 1?
Yes
nBACKFEED_CUT = 0
nSLP_S5 = 0
No
LATCHED_BF_CUT = 0
LATCHED_BF_CUT = 1
(After Tpropr)
No
nBACKFEED_CUT = 1?
Yes
nSLP_S5 = 0?
No
Yes
No
LATCHED_BF_CUT = 0
(After Tpropf)
(This is end of T3)
nBACKFEED_CUT = 0?
Yes
Power Rails Stabilized?
(Period T2)
(Verified by ICH)
No
nSLP_S5 = 1?
Yes
LATCHED_BF_CUT = 0
(After Tpropf)
No
Yes
nSLP_S5 = 1
(Controlled by ICH)
Period T4
nBACKFEED_CUT = 0
(Controlled by nSLP_S3
and PWRGD_PS)
nBACKFEED_CUT = 0?
(Period T1)
No
Yes
End of Power Up Sequence
Main Power
Active
Figure 7.18 – Latched Backfeed Cut Flowchart
SMSC LPC47M182
151
Revision 1.8 SMSC/Non-SMSC Register Sets (02-24-05)
DATASHEET
SMSC [ SMSC CORPORATION ]
