NH82801DB S L8DE Intel, NH82801DB S L8DE Datasheet - Page 49

• Manufacturer Part Number: NH82801DB S L8DE
• Manufacturer: Intel

Specifications of NH82801DB S L8DE

• Lead Free Status / RoHS Status: Compliant

2.14
2.15
2.16
Intel
®
Table 2-14. Real Time Clock Interface
Table 2-15. Other Clocks
Table 2-16. Miscellaneous Signals
82801DB ICH4 Datasheet
Real Time Clock Interface
Other Clocks
Miscellaneous Signals
RTCRST#
RTCX1
RTCX2
CLK14
CLK48
CLK66
Name
Name
Name
SPKR
TP[0]
Special
Special
Type
Type
Type
O
I
I
I
I
I
Crystal Input 1: This signal is connected to the 32.768 kHz crystal.
Crystal Input 2: This signal is connected to the 32.768 kHz crystal.
Oscillator Clock: This clock is used for 8254 timers. It runs at 14.31818 MHz.
This clock is permitted to stop during S3 (or lower) states
48 MHz Clock: This clock is used to run the USB controllers. It runs at 48
MHz. This clock is permitted to stop during S3 (or lower) states
66 MHz Clock: This clock is used to run the hub interface. It runs at 66 MHz.
This clock is permitted to stop during S3 (or lower) states
Speaker: The SPKR signal is the output of counter 2 and is internally “ANDed”
with Port 61h bit 1 to provide Speaker Data Enable. This signal drives an
external speaker driver device, which in turn drives the system speaker. Upon
PCIRST#, its output state is 0.
NOTE: SPKR is sampled at the rising edge of PWROK as a functional strap.
RTC Reset: When asserted, this signal resets register bits in the RTC well and
sets the RTC_PWR_STS bit (bit 2 in GEN_PMCON3 register).
NOTES:
Test Point: This signal must have an external pull-up to VccSus3_3.
1. Clearing CMOS in an Intel
2. Unless entering the XOR Chain Test Mode, the RTCRST# input must
jumper on RTCRST# or GPI, or using SAFEMODE strap. Implementations
should not attempt to clear CMOS by using a jumper to pull VccRTC low.
always be high when all other RTC power planes are on.
See
down resistor on SPKR pin.
Section 2.20.1
for more details. There is a weak integrated pull-
®
ICH4-based platform can be done by using a
Description
Description
Description
Signal Description
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