Intel E3815 FH8065301567411 Fiche De Données
Codes de produits
FH8065301567411
PCU – iLB – Real Time Clock (RTC)
Intel
®
Atom™ Processor E3800 Product Family
4546
Datasheet
36.3.2.1
Using ILB_RTC_TEST# to Clear the RTC CMOS RAM
A jumper on ILB_RTC_TEST# can be used to clear CMOS values. When
ILB_RTC_TEST# is low, the GEN_PMCON1.RPS register bit will be set. BIOS can
monitor the state of this bit, and manually clear the RTC CMOS array once the system
is booted. The normal position will cause ILB_RTC_TEST# to be pulled up through a
weak pull-up resistor. This ILB_RTC_TEST# jumper technique allows the jumper to be
moved and then replaced—all while the system is powered off. Then, once booted, the
GEN_PMCON1.RPS bit can be detected in the set state.
ILB_RTC_TEST# is low, the GEN_PMCON1.RPS register bit will be set. BIOS can
monitor the state of this bit, and manually clear the RTC CMOS array once the system
is booted. The normal position will cause ILB_RTC_TEST# to be pulled up through a
weak pull-up resistor. This ILB_RTC_TEST# jumper technique allows the jumper to be
moved and then replaced—all while the system is powered off. Then, once booted, the
GEN_PMCON1.RPS bit can be detected in the set state.
36.3.3
Using a GPI to Clear CMOS
A jumper on a GPI can also be used to clear CMOS values. BIOS should detect the
setting of this GPI on system boot-up, and manually clear the CMOS array.
setting of this GPI on system boot-up, and manually clear the CMOS array.
Note:
The GPI strap technique to clear CMOS requires multiple steps to implement. The
system is booted with the jumper in new position, then powered back down. The
jumper is replaced back to the normal position, then the system is rebooted again.
system is booted with the jumper in new position, then powered back down. The
jumper is replaced back to the normal position, then the system is rebooted again.
Warning: Do not implement a jumper on RTC_VCC to clear CMOS.
36.3.4
Clearing Battery Backed RTC Registers
Clearing Battery Backed RTC Registers in an SoC based platform can be done by using
a jumper on ILB_RTC_RST#. Implementations should not attempt to clear the registers
by using a jumper to pull RTC_VCC low. A jumper on ILB_RTC_RST# pulled to ground
can be used to reset the state of those Battery Backed RTC Register configurations bit
that reside in the RTC power well to their default state.
a jumper on ILB_RTC_RST#. Implementations should not attempt to clear the registers
by using a jumper to pull RTC_VCC low. A jumper on ILB_RTC_RST# pulled to ground
can be used to reset the state of those Battery Backed RTC Register configurations bit
that reside in the RTC power well to their default state.
shows which bits are
set to their default state when ILB_RTC_RST# is asserted low.
Table 326. Register Bits Reset by ILB_RTC_RST# Assertion (Sheet 1 of 2)
Register Bit
Bit(s)
Default State
RCRB_GENERAL_CONTROL.TS
1
xb
GEN_PMCON1.PME_B0_S5_DIS
15
0b
GEN_PMCON1.WOL_EN_OVRD
13
0b
GEN_PMCON1.DIS_SLP_X_STRCH_SUS_UP
12
0b
GEN_PMCON1.RTC Reserved
8
0b
GEN_PMCON1.SWSMI_RATESEL
7:6
00b
GEN_PMCON1.S4MAW
5:4
00b
GEN_PMCON1.S4ASE
3
0b
GEN_PMCON1.AG3E
0
0b
PM1_STS_EN.RTC_EN
26
0b
PM1_STS_EN.PWRBTNOR_STS
11
0b