NH82801FBM S L89K Intel, NH82801FBM S L89K Datasheet - Page 391

• Manufacturer Part Number: NH82801FBM S L89K
• Manufacturer: Intel

Specifications of NH82801FBM S L89K

• Lead Free Status / RoHS Status: Compliant

10.7.2
10.7.3
Intel
®
I/O Controller Hub 6 (ICH6) Family Datasheet
Note: The RTC Index field is write-only for normal operation. This field can only be read in Alt-Access
NMI_EN—NMI Enable (and Real Time Clock Index)
Register (LPC I/F—D31:F0)
I/O Address:
Default Value:
Lockable:
Mode. Note, however, that this register is aliased to Port 74h (documented in), and all bits are
readable at that address.
PORT92—Fast A20 and Init Register (LPC I/F—D31:F0)
I/O Address:
Default Value:
Lockable:
Bits
6:0
Bit
7:2
7
1
0
NMI Enable (NMI_EN) — R/W (special).
0 = Enable NMI sources.
1 = Disable All NMI sources.
Real Time Clock Index Address (RTC_INDX) — R/W (special). This data goes to the RTC to
select which register or CMOS RAM address is being accessed.
Reserved
Alternate A20 Gate (ALT_A20_GATE) — R/W. This bit is Or’d with the A20GATE input signal to
generate A20M# to the processor.
0 = A20M# signal can potentially go active.
1 = This bit is set when INIT# goes active.
INIT_NOW — R/W. When this bit transitions from a 0 to a 1, the ICH6 will force INIT# active for 16
PCI clocks.
70h
80h
No
92h
00h
No
Description
Description
LPC Interface Bridge Registers (D31:F0)
Attribute:
Size:
Power Well:
Attribute:
Size:
Power Well:
R/W (special)
8-bit
Core
R/W
8-bit
Core
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