LPC47M172_07 SMSC [SMSC Corporation], LPC47M172_07 Datasheet - Page 144

• Manufacturer Part Number: LPC47M172_07
• Description: Advanced I/O Controller with Motherboard GLUE Logic
• Manufacturer: SMSC [SMSC Corporation]

Advanced I/O Controller with Motherboard GLUE Logic
Datasheet
Note:
APPLICATION NOTE:
SMSC/Non-SMSC Register Sets (Rev. 01-11-07)
The figure below shows the power up sequence. The nBACKFEED_CUT signal follows the power rail up to its
final value. The LATCHED_BF_CUT signal stays low and never turns on. The nSLP_S5 goes to its high value
when the power rails have stabilized, approximately 25msec after power on. nBACKEED_CUT is pulled low a
period t1 after nSLP_S5 goes high. The period t1 can be as short as 1msec. Typical measured values are
The LATCHED_BF_CUT is generated from nBACKFEED_CUT and nSLP_S5. It is powered by VTR.
This is the condition when nBACKFEED_CUT stays high and nSLP_S5 goes low and then high again (see
Figure 7.19).
PWRGD_PS
nSLP_S3
nSLP_S5
(INTERNAL SIGNAL)
‘1’ and no rising edge
NBACKFEED_CUT
0 to 1 (rising edge)
Figure 7.16 - Backfeed Cut and Latched Backfeed Cut Circuit
0
0
1
Table 7.45 - LATCHED_BF_CUT Truth Table
SMSC I/O
INPUTS
DATASHEET
NSLP_S5
Page 144
0
1
0
1
1
1k
+5VTR
ohms
ohms
LATCHED_BF_CUT
470
470
No Change (Note)
OUTPUT
1k
1k
1k
+5VTR
+12
+12
0
0
0
1
BACKFEED_CUT
SMSC LPC47M172