SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 184

• Manufacturer Part Number: SCH3112I-NE
• Description: LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
• Manufacturer: SMSC [SMSC Corporation]

Rev 0.2 (09-28-04)
19.1.2
NAME
Tpropf
CO
CL
N ote: This figure is for illustration purposes only and not m eant to im ply specific im plem entation dertails
PC I_ R E SET #
PC I_I(V cc)
DESCRIPTION
nIDE_RSTDRV high to low propagation time. Measured from
PCI_RESET# to nIDE_RSTDRV.
Output Capacitance
Load Capacitance
nPCIRSTx Output Logic
The nPCIRST1, nPCIRST2, and nPCIRST3 outputs are 3.3V balance buffer push-pull buffered copies
of PCI_RESET# input. Each pin function’s default state on VTR POR is the nPCIRSTx function;
however, the pin function can be programmed to the a GPO pin (output only) function by bit 2 in the
corresponding GPIO control register (GP45, GP46, GP47).
Each nPCIRSTx output has a programmable force reset. The software control of the programmable
forced reset function is located in the GP4 GPIO Data register. When the corresponding (GP45, GP46
GP47) bit in the GP4 GPIO Data register is set, the nPCIRSTx output follows the PCI_RESET# input;
this is the default state on VTR POR. When the corresponding (GP45, GP46, GP47) bit in the GP4
GPIO Data register is cleared, the nPCIRSTx output stays low.
See GP4 for Runtime Register Description.
When the VTR power is applied, VCC is powered down, and the GPIO control register’s contents are
default, the nPCIRSTx pin output is low.
The
not intended to suggest specific implementation details.
Figure 19.1
Internal V C C
pow er good
active high
signal
illustrates the nPCIRSTx function. The figure is for illustration purposes only and in
Table 19.3 nIDE_RSTDRV Timing (continued)
Figure 19.1 nPCIRSTx Logic
V TR
DATASHEET
LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
O ne B it in the
D efault = 1 on
G P IO D A T A
168
V T R P O R
G P 4
This sig nal is 0
w he n VC C =0
MIN
VTR
TYP
MAX
22
25
40
SMSC SCH311X
nPC IR S Tx
UNITS
ns
pF
pF
Datasheet