LPC47M172 SMSC Corporation, LPC47M172 Datasheet - Page 142

• Manufacturer Part Number: LPC47M172
• Description: ADVANCED I/O CONTROLLER WITH MOTHERBOARD GLUE LOGIC
• Manufacturer: SMSC Corporation

Advanced I/O Controller with Motherboard GLUE Logic
Datasheet
Note:
See
SMSC/Non-SMSC Register Sets (Rev. 02-27-04)
The actual minimum debounce time is 15.8msec
Table 13.5 for PWRGD_3V timing.
The following figure shows the discrete implementation for the creation of the PWRGD_3V signal on the
motherboard.
The following figure represents the integration of the logic into the LPC47M172.
PWRGD_PS
nFPRST
PWRGD_PS
nFPRST
Figure 7.12 - PWRGD_3V Circuit, Discrete Implementation
(SHOWING NFPRST INPUT DEBOUNCE CIRCUITRY)
0
0
1
1
Figure 7.13 - PWRGD_3V Circuit in LPC47M172
Table 7.40 - PWRGD_3V Truth Table
INPUTS
3.3kohm
DATASHEET
1uF
PWRGD_PS
Page 142
Debounce
SMSC I/O
0
1
0
1
Circuitry
PWRGD_3V
OUTPUT
PWRGD_3V
PWRGD_3V
0
0
0
1
SMSC LPC47M172