LPC47M182 SMSC Corporation, LPC47M182 Datasheet - Page 148

• Manufacturer Part Number: LPC47M182
• Description: ADVANCED I/O CONTROLLER WITH MOTHERBOARD GLUE LOGIC
• Manufacturer: SMSC Corporation

Note:
APPLICATION NOTE:
Revision 1.8 SMSC/Non-SMSC Register Sets (02-24-05)
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 7.17).
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
PWRGD_PS
nSLP_S3
nSLP_S5
(INTERNAL SIGNAL)
‘1’ and no rising edge
NBACKFEED_CUT
0 to 1 (rising edge)
Figure 7.14– Backfeed Cut and Latched Backfeed Cut Circuit
0
0
1
Table 7.44 – LATCHED_BF_CUT Truth Table
SMSC I/O
INPUTS
DATASHEET
NSLP_S5
148
0
1
0
1
1
1k
+5VTR
ohms
ohms
LATCHED_BF_CUT
470
470
Advanced I/O Controller with Motherboard GLUE Logic
No Change (Note)
OUTPUT
1k
1k
1k
+5VTR
+12
+12
0
0
0
1
BACKFEED_CUT
SMSC LPC47M182
Datasheet